Frolov, A.V. 2002. A review of the Aphodius Illiger, 1798 subgenus Chilothorax Motschulsky, 1859 (Coleoptera: Scarabaeidae) of China. Russian Entomological Journal, 10(4): 395–399.

A review of the Aphodius Illiger, 1798 subgenus Chilothorax Motschulsky, 1859 (Coleoptera: Scarabaeidae) of China

A.V. Frolov

Zoological Institute of the Russian Academy of Sciences, Universitetskaya Emb. 1, 199034 Saint Petersburg, Russia

Representatives of Aphodius Illiger, 1798, subgenus Chilothorax Motschulsky, 1859, of China are reviewed and a key to species is presented. One new species, A. potanini Frolov, sp.n., is described and A. kukunorensis Semenov, 1898 is re-described.
Дан обзор и определительная таблица видов подрода Chilothorax Motschulsky рода Aphodius Illiger, обитающих в Китае. Дано переописание A. kukunorensis Semenov. Описан новый вид A. potanini Frolov, sp.n.

Introduction

Scarab beetles of the genus Aphodius Illiger occurring in China are difficult to identify because they are very diverse and have been poorly studied. In the present article, the Chinese members of the subgenus Chilothorax Motschulsky are reviewed, and one new species is described. Because many distinctive characters are missing in the original description of A. kukunorensis Semenov, this species is re-described.

This study is based on material collected during some Central Asian expeditions organized by the Russian Geographical Society at the end of the nineteenth and beginning of the twentieth centuries, and deposited in the collection of Zoological Institute. Additional material loaned from Czech colleagues was also examined.

Abbreviations as follows:

ZISP – collection of Zoological Institute, St. Petersburg; MNPC – collection of Museum of Natural History, Praha; DKCP – David Král's collection, Praha; RCCP – Radek Červenka's collection, Praha.

In order to define type and collection localities more exactly I compared the label data with the itineraries of the expeditions [Potanin, 1893, Kozlov, 1902]. Specific collecting localities are listed below and are numbered for easy reference within the following species discussions.

G.N. Potanin's expedition in Gansu (1884–1886)

1. "Kan-ssa, 24.V.1885" – Kadigar (Kadiger) Cloister (35°5' N 103° E), ca. 150 km SSW of Lanzhou.

B.L. Grombczewsky's expedition in south-western area of Central Asia (1889–1890).

2. "Полу, 1.VI.1890" – Pulu (36°10' N 81°30' E), northern slope of Kunlun Ridge, Xinjiang Uygur autonomous region.

M.V. Pevtsov's expedition in Tibet (1889–1890).

3. "Карасай, хр. Русский, V.1890" – Karasay (36°50' N 83°50' E), northern slope of Kunlun, Xinjiang Uygur autonomous region.

P.K. Kozlov's expedition in Mongolia and Tibet (1899–1901) (Qinghai province).

4. "Предгорья хр. Бурхан-Будда, ущелье Номохун, 17.V.1900" – northern slope of Burhan Budai Shan, ca. 20 km S of Barun (36°10' N 97°20' E).

5. "Южный склон хр. Бурхан-Будда, долина оз. Алык-Нор, 30.V.1900" – northern slope of Burhan Budai Shan, valley of Alag Hu (Alyk-Nor) [lake] (35°30' N 96°50' E).

6. "Горы Амнэн-кор, 13–14.500', начало VI.1900" – A'nyemaqen Shan mountains, beginning of VI.1900.

7. "Долина озера, верхн. Хуан-хэ, конец VI.1900" – valley of Ngoring Hu (Orin-Nor) [lake] (35° N 98° E), end of VI.1900.

8. "Долина реки Джагын, начало VII.1900" – valley of Dzhagyn River (34°30' N 98°40' E), beginning of VII.1900.

9. "Левый приток р. Бы-чю, 14.000', VII.1900" – left tributary of By-chu River, southern slope of Bayan Har Shan (34° N 96°30' E).

10. "Бассейн Голубой реки, долина р. Дза-чю, 12–13.000', V.1901" – Chang Jiang basin, valley of Dza-chu River (32°40' N 98°50' E).

11. "Бассейн Желтой реки, долина р. Сэрг-чю, 13.500', конец V.1901" – Huang He basin, southern slope of Bayan Har Shan, valley of Serg-chu River (34°15' N 98°20' E), end of V.1901.

12. "Тибетское нагорье, бассейн Желтой реки, конец V.1901" – the same as No. 11.

Key to the Chilothorax of China.

1.      Elytral intervals shagreened; body smaller (4.0–4.5 mm); elytra with longitudinal brown maculae on intervals 3–8 (Figs. 22, 23); apices of parameres with very long, feebly sclerotized processes (Fig. 24) ... A. bistriga Reitter

–       Elytral intervals shiny; most of species longer (4.5–7.0 mm); apices of parameres lacking processes, or with short processes ... 2

2.      Genae more or less rounded or obtuse; elytra maculate (Figs. 11, 15, 19); disc of metasternum pubescent or glabrous ... 3

–       Genae acute-angled or right-angled; elytra often dark brown, yellowish apically and laterally, or yellowish brown with dark brown maculae (Figs. 2, 5, 9); disc of metasternum pubescent ... 5

3.      Disc of metasternum glabrous; apices of parameres wider, without processes ... 4

–       Disc of metasternum pubescent (setae may be abraded in some individuals); apices of parameres narrow, acute, with feebly sclerotized processes (Fig. 12) ... A. potanini Frolov, sp.n.

4.      Body wider (Fig. 18); fore tibia of ♂ relatively slender and parallel-sided, its inner margin slightly convex, fore tibial spur short (Fig. 21); apices of parameres narrower in lateral aspect (Fig. 20) ... A. praenubilis Balthasar

–       Body narrower (Fig. 14); fore tibia of male of typical shape, its inner margin slightly concave, fore tibial spur long (Fig. 17); apices of parameres wider in lateral aspect (Fig. 16) ... A. altaicus Nikolajev (males)

5.      Apices of parameres acute in lateral aspect (Fig. 4) ... A. dzongensis Petrovitz

–       Apices of parameres more or less rounded in lateral aspect ... 6

6.      Parameres nearly parallel-sided in dorsal aspect (Fig. 6) ... A. sinicus Červenka

 –      Parameres tapering from base to apex in dorsal aspect (Fig. 3) ... A. kukunorensis Semenov

Figs. 1–9. 1, 2, 3 – A. kukunorensis; 5, 6, 7 – A. sinicus; 4, 8, 9 – A. dzongensis;

Figs. 1–9. 1, 2, 3 – A. kukunorensis; 5, 6, 7 – A. sinicus; 4, 8, 9 – A. dzongensis; 1, 7, 8 – habitus; 2, 5, 9 – elytral pattern; 3, 4, 6 – aedeagus in dorsal and lateral view. А – scale for figs. 1, 7, 8; В – for figs. 3, 4, 6.

Aphodius (Chilothorax) altaicus Nikolajev, 1984.

Figs. 14, 15, 16, 17.

Material examined. Qinghai: 18 spm. with label No. 5; 1 spm. with label No. 6; 1 spm. with label No. 4; 24 spm. with label No. 12; Xinjiang Uygur autonomous region: 1 spm. with label No. 3 (ZISP).

Distribution. This species was described from Mongolia (Gov'-Altaj: Ich Bogd mountains); it is recorded from China for the first time.

Aphodius (Chilothorax) praenubilis Balthasar, 1933.

Figs. 18, 19, 20, 21.

Material examined. Xinjiang Uygur autonomous region: 36 spm. with label No. 2; 29 spm. with label No. 3 (ZISP).

Distribution: Tien-Shan, Kunlun mountains.

Aphodius (Chilothorax) huangyuanensis Červenka, 1994.

This species was described from northeastern Tibet (Qinghai: 40 km S of Huangyuan). Unfortunately, I had no opportunity to examine the type of the species. According to the characters given in the original description, it cannot be distinguished from A. praenubilis, and the two may prove to be conspecific.

Aphodius (Chilothorax) kukunorensis Semenov, 1898.

Figs. 1, 2, 3.

Material examined. Holotype ♂ with label No. 1. Qinghai: 4 ♂♂ with label No. 12 (ZISP).

Re-description. Male (Fig. 2). Body length 6.0 mm. Head black, shiny, densely punctate (punctures separated by 0.5 to 1.5 times their diameter), with traces of frontal tubercles; frontoclypeal suture indistinct. Clypeus wide, slightly sinuate in middle, rounded at sides. Genae acute-angled. Distance between eye and gula approximately 1.5 times the width of eye in ventral view.

Pronotum black, shiny, with finely bordered sides and base and unbordered anterior margin, with double puncturation on disc (big punctures 2 times larger than small ones; small punctures separated by 1.5 to 2.5 times their diameter). Posterior angles of pronotum obtuse. Fore angles of pronotum pale brown, sides slightly paler than disc.

Scutellum dark brown, shiny, coarsely punctate on base.

Elytra shiny, without humeral denticles, yellowish brown with longitudinal dark brown maculae (Fig. 2). Elytral intervals slightly convex, punctate (punctures separated by 2 to 3 times their diameter on disc, becoming denser towards apices). Sutural intervals pale brown, suture dark brown. Striae fine, punctate (diameter of punctures slightly bigger than width of striae, punctures separated by 3 to 4 times their diameter). Apices and sides of elytra with short, but distinct setae.

Legs brown. Apical spur of anterior tibia acute and slightly curved downward and outward, reaching middle of second tarsal segment. Apical spurs of middle tibia slender and acute; lower spur 1/3 shorter than upper. First segment of hind tarsi equal in length to upper spur of tibia and slightly longer than 2 following segments together. Apical setae of hind and middle tibiae unequal and relatively short.

Disc of metasternum slightly concave, coarsely punctate on the margin, glabrous (setae may be abraded). Apices of parameres more or less rounded in lateral aspect (Fig. 3).

Female unknown.

Differential diagnosis. This species is very similar to the following two species. It can be reliably separated from A. dzongensis by the apices of parameres more or less rounded in lateral aspect. It is more difficult to separate it from A. sinicus, and the study of additional material may show that the diagnostic character used to separate the species in the key, is actually within the limits of variation of one species.

Distribution. This species, as well as two following, are endemic to Tibet.

Figs. 10–21. 10, 11, 12 – A. potanini sp. n.; 13 – A. tanhensis, parameres in dorsal and lateral view; 14, 15, 16, 17 – A. altaicus; 18, 19, 20, 21 – A. praenubilis;

Figs. 10–21. 10, 11, 12 – A. potanini sp. n.; 13 – A. tanhensis, parameres in dorsal and lateral view; 14, 15, 16, 17 – A. altaicus; 18, 19, 20, 21 – A. praenubilis; 10, 14, 18 – habitus; 11, 15, 19 – elytral pattern; 12, 16, 20 – aedeagus in dorsal and lateral view; 17, 21 – fore tibia of ♂. А – scale for figs. 10, 14, 18; В – for figs. 12, 13, 16, 20.

Aphodius (Chilothorax) dzongensis Petrovitz, 1976.

Figs. 4, 8, 9.

Material examined. Qinghai: 9 spm. with label No. 8; 1 spm. with label No. 9; 1 spm. with label No. 6 (ZISP); Qingshuihe (33°50' N 97°5' E), 4200 m, 1–5.VII.1992, 28 spm. (Z. Molek) (RCCP); Daotanghe (36°25' N 100°55' E), 25–27.VII.1992, 2 spm. (DKCP).

Aphodius (Chilothorax) sinicus Červenka, 1994.

Figs. 5, 6, 7.

Material examined. Qinghai: 5 paratypes (2 ♂♂ and 3 ♀♀), 120 km W of Qinghai Hu [lake], Tianjun (37°10' N 99° E), 3500 m, 3–4.VII.1990, (Nikodym) (RCCP); 6 spm. with label No. 7; 1 spm. with label No. 12 (ZISP); Chalaxung (34°5' N 97°45' E), 4000 m, 19.VII.1992, 4 spm. (DKCP); eastern Qilian Shan (Nan Shan) mts., 4200 m., 29.VII–1.VIII.1992, 1 spm., (J. Kalab) (DKCP).

Specimens examined differ slightly from A. kukunorensis in being smaller, having the pronotum relatively wider and having the apices of the parameres wider in dorsal aspect.

Aphodius (Chilothorax) bistriga Reitter, 1900.

Figs. 22, 23, 24.

Material examined. Qinghai: Qilian Shan, Tenkor, 10.V.1951, 1 spm. (P. Eichinger) (MNPC); Gansu: Xiahe, 3000–3900 м, 20.V.1991, 1 spm. (Paulus) (DKCP); 25 km E of Xiahe, 2805–2925 m, 3.VIII.1994, 2 spm. (Smetana) (ZISP).

Distribution. Known only from Tibet.

Fig. 8. A. bistriga. 22 – habitus; 23 – elytral pattern; 24 – aedeagus in dorsal and lateral view.

Fig. 8. A. bistriga. 22 – habitus; 23 – elytral pattern; 24 – aedeagus in dorsal and lateral view.

Aphodius (Chilothorax) potanini Frolov, sp. n.

Figs. 10, 11, 12.

Material. Holotype ♂ with label No. 10; 3 paratypes: ♂ with label No. 11), ♂ and ♀ with label No. 7 (ZISP). Type specimens supplied with red labels "Holotypus [Paratypus] Aphodius potanini A. Frolov det. 2000".

Description. Holotype ♂. Body length 5.2 mm. Head dark brown, shiny, punctate (punctures separated by 0.5 to 1.5 times their diameter), without frontal tubercles. Clypeus wide, indistinctly sinuate in middle, rounded at sides. Frontoclypeal suture indistinct. Genae obtuse, slightly protruding past eyes. Minimum distance between eye and gula approximately the same as the width of eye in ventral view.

Pronotum shiny, dark brown on disc, with yellowish brown sides, with double, dense puncturation on disc (big punctures 2 times larger than small ones in diameter; small punctures separated by 1 to 3 times their diameter). Anterior margin unbordered, lateral margins and base finely bordered. Posterior angles of pronotum obtusely rounded.

Scutellum wide triangular, shiny, dark brown, punctate on base.

Elytra shiny, yellowish brown with longitudinal dark brown maculae on intervals 3, 5, and 7, without humeral denticles. Striae fine, densely punctate (diameter of punctures slightly bigger than width of striae, punctures separated by 1 to 1.5 times their diameter).

Elytral intervals flat, densely punctate (punctures separated by 1.5 to 2 times their diameter). Sutural intervals pale brown, suture dark brown. Apices and sides of elytra with short, pale setae.

Apical spur of anterior tibia acute and curved downward, reaching middle of second tarsal segment. Apical spurs of middle tibia slender and acute; lower spur 1/3 shorter than upper. First segment of hind tarsi equal in length to upper spur of tibia and slightly longer than 2 following segments together. Apical setae of hind and middle tibiae relatively short and unequal.

Disc of metasternum slightly concave, punctate, pubescent with short, pale setae.

Apices of parameres slender and acute, with relatively long processes.

Female differs from ♂ in narrower pronotum and more densely punctate pronotum and head.

Paratypes. Body length 5.3–4.8 mm.

Differential diagnosis. This species is closely related to A. grafi Reitter and, especially, to A. tanhensis Frolov. It can be best distinguished from the both species by the more slender apices of parameres, which have feebly sclerotized lateral processes.

Etymology. The species is named in honor of G.N. Potanin, noted Russian researcher of Central Asia.

Acknowledgements

I would like to thank Dr. David Král, Mr. Radek Červenka, and Dr. Josef Jelinek (Praha) for loan of material, and Dr. Paul Lago (University of Mississippi) for linguistic review of the manuscript and valuable suggestions.

References

Kozlov P.K. 1902. [Itinerary of Tibetan expedition of Imperial Russian Geographical Society under the direction of P.K. Kozlov in 1899–1901] // An. Mus. zool. Ac. imp. Vol. 7, P. XX-XXXVIII (in Russian).

Potanin G.N. 1893. [Tangut-Tibetan area of China and Central Mongolia]. Vol. 1. S.Petersburg (in Russian).