Chlamisus yunnanus Bowditch 1913

Chlamisus yunnanus (Bowditch, 1913)

(Figs 31-1; 31-2)

Bowditch, 1913: 308 (orig.: Chlamys yunnana; type locality: Yunnan; type deposited: MCZ); Chen, 1940: 195; Gressitt, 1946: 100 (as Chlamisus yunnanus); Gressitt & Kimoto, 1961: 189; Medvedev, 1968: 564 (Chlamysus yunnanus, Vietnam); Kimoto & Gressitt, 1981: 362; Tan, 1988: 318.

Syn.: Chlamys aterrima Gressitt, 1942b: 355, 357 (type locality: Kiung-shan, Hainan; type deposited: LINGNAN); Gressitt, 1946: 88 (as Chlamisus aterrimus; Hainan); Gressitt & Kimoto, 1961: 189 (as synonym of Chlamisus yunnanus).

Material examined. CHINA: Xizang: 1♂, Bomi, Yi-gong, 2300 m, 22. VIII. 1983, coll. Yinheng Han. (Female specimen absent)

Measurements. BL = 1.8 mm, BW = 1.3 mm, HL = 0.7 mm, HW = 0.7 mm, PL = 0.8 mm, PW = 1.1 mm, EL = 1.6 mm, PYL = 0.7 mm, PYW = 0.7 mm,

Redescription. Body (Figs 31-1A; 31-2A) very small and opaque. Labrum, and tarsi with short white hairs. General color black with slight reddish brown.

Head (Figs 31-1D; 31-2E) nearly round, dense-shallowly punctured, a round fovea in the middle of vertex; labrum yellowish brown, triangular, three times as broad as long, eyes black.

Antennae (Figs 31-1I; 31-2C) dark brown, darker on basal 4 segments. Scape one and half as long as broad, pedicel subtriangular, 3rd and 4th short and slender, 5th and 6th slightly dilated, 7–10th flat and broad, serrated, 11th ovate, a small notch on apex.

Pronotum (Fig. 31-1F) deeply and densely punctured, puncture intervals raised; a large but low tubercle on each lateral portion; disc moderately elevated, stronger posteriorly, anterior-declivity flat, median longitudinal groove deep and throughout, bordered by a pair of longitudinal ridges, and two pairs of longitudinal and slightly oblique ridges arranged laterally. Scutellum (Fig. 31-1H) rather narrow, posterior-lateral angles slightly extended, apex acute. Prosternum (Figs 31-1E; 31-2B) infundibular, very wide basally, prosternal process strongly narrowed.

Elytra (Fig. 31-2G) rounded apically, lateral sides of elytra subparallel; deeply, coarsely and sparsely punctured; suture teeth absent; basal margin from scutellum to near median row weakly rugose, humeri finely rugose; longitudinal ridges sharp and tubercles sharp; sutural row consisting of three tubercles, 1st obsolete, 2nd small, connected to 2nd tubercle of median row, 3rd merging with 3rd tubercle of median row into a transverse one, 4th indistinct; median row consisting of four tubercles, 1st situated near basal margin, 2nd merging with 2nd tubercle of humeral row into a transverse tubercle, 4th obsolete, 5th largest, longitudinal; humeral row consisting of two tubercles, 1st obsolete, 3rd small; lateral row with only one tubercles, 1st transverse, 2nd obsolete; a small and sharp tubercle at the posterior-lateral angle, also a large tubercle consisting of several small tubercles above it, and a small tubercle by its side. Legs (Fig. 31-1J) dark brown to black.

Abdomen (Fig. 31-1G) densely and shallow-roundly punctured; 1st visible abdominal segment with two low tubercles near lateral margins, 5th segment with a large and shallow round fovea in the middle. Pygidium (Figs 31- 1C; 31-2F) as long as broad, deeply and sparsely punctured, median longitudinal carina sharp but feeble, lateral carinae feeble and slightly sinuated, weaker than median carina, without distinct transverse carina; interspaces of these carinae moderately depressed, and the lateral portions deeply depressed.

Male genitalia lost in the only specimen.

Distribution. China (Hainan, Xizang, Yunnan); Vietnam.

Diagnosis: This species differs from C. palliditarsis by the following character combination: very small body size, elytra suture without teeth; having the occipital concavity shallow the pronotal carinae more sinuate, the pygidium with the median carina very feeble and the lateral carinae not strongly sinuate at middle. Its antennae and tarsi are very dark.