PROC. ENTOMOL. SOC. WASH. 109(1), 2007, pp. 131-135 A KEY TO SPECIES OF THE GENUS CACCOBIUS THOMSON (COLEOPTERA: SCARABAEIDAE: SCARABAEINAE) FROM CHINA, WITH DESCRIPTION OF A NEW SPECIES Ming Bai, Youwei Zhang, and Xingke Yang (MB, YZ, XY) Institute of Zoology, Chinese Academy of Sciences, 36 Box, 25 Bei SiHuanXiLu, Haidian, Beijing, 100080, China (e-mail:
[email protected]); (MB) Graduate School, Chinese Academy of Sciences, Yuquanlu, Shijingshan, Beijing, 100039, China (e-mail:
[email protected]). Corresponding author: Xingke Yang (e-mail:
[email protected]) Abstract. — Diagnosis, description, and illustrations of the head, pronotum, profemur, protibia, pygidium, and aedeagus of Caccobius {Caccobius) excavatus, n. sp., are given. A key to the species of Caccobius Thomson from China is included. Key Words: China, Caccobius, Scarabaeinae, Scarabaeidae, Coleoptera, new species, key The genus Caccobius (Coleoptera: Scarabaeidae: Scarabaeinae: Onthopha-gini) was established by Thomson in 1863. There are 89 world species (Gillet 1911, Balthasar 1963) and 18 species currently known in China, including one new species described here. Species of Caccobius are tunnellers, and their nest-ing behavior is complex (Halffter and Edmonds 1982, Philips et al. 2004). They can be collected from various animal excrement, such as cow, elephant, gaur, buffalo, pig, and human. The species of this genus are of short compact form and generally of small size, some of them very small. The front angles of the thorax have a deep, sharply defined, hollow beneath. Males may be armed with a single short horn, a pair of horns, or they may be entirely without armature. In this paper, 18 species of Caccobius from China are treated, among them Caccobius {Caccobius) excavatus de-scribed as new. A key to the species of China and illustrations of the head. pronotum, profemur, protibia, pygidi-um, and aedeagus of C excavatus and C jessoensis are given. Caccobius {Caccobius) excavatus Bai, Zhang, and Yang, new species (Figs. 1-6) Holotype male. — Length from clypeus to pygidium 6.5 mm; width across hu-meri 3.5 mm. Shape broadly oval, com-pact, convex. Color deep dark brown; head and pronotum slightly metallic, elytra brown at base and apex. Head: Clypeus with front margin deeply notched in middle, finely and closely rugulose. Anterior carina of head short, not close to front margin. Thorax: Shape of pronotum parabolic, 1.2 times wider than long. Surface strongly and closely punctate, without median line, completely margined. Anterolateral an-gles of pronotum acute (Fig. 1). Profe-mur with strong, dense punctures, meso-and metafemora with fine and sparse punctures. Procoxa with long pubes-
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