Chaetocnema (Udorpes) umesaoi Chûjô, 1961

Ruan, Yongying, Yang, Xingke, Konstantinov, Alexander S., Prathapan, Kaniyarikkal D. & Zhang, Mengna, 2019, Revision of the Oriental Chaetocnema species (Coleoptera, Chrysomelidae, Galerucinae, Alticini), Zootaxa 4699 (1), pp. 1-206 : 194

83. Chaetocnema (Udorpes) umesaoi Chûjô, 1961

( Fig. 112 )

Chaetocnema umesaoi Chûjô, 1961: 355 . TL: Thailand, Bankok. TD: KMNH.

Distribution: Thailand, India.

Host plants: Unknown.

Description: Body length 1.55–1.70 mm, body width 0.95–1.05 mm. Ratio of elytron length (along suture) to width (maximum): 2.20–2.25. Ratio of pronotum width (at base) to length: 1.50–1.55. Ratio of length of elytron to length of pronotum (along middle): 2.40–2.45. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): 1.05–1.10. Ratio of maximum width of elytra to maximum width of pronotum: 1.50–1.55.

Dorsum bronzy. Antennae slender, reach slightly beyond humeral calli. Antennomeres 1–5 more or less yellow brown, 6–11 brown, distal antennomeres darkened. Tibiae and tarsi brown. Pro- and mesofemora brown. Metafemora deep brown.

Head hypognathous. Frontal ridge wide and flat, with closely placed punctures. Frontolateral sulcus absent. Suprafrontal sulcus present, moderately developed. Ratio of width of frontal ridge to width of antennal socket (counting surrounding ridges): 1.65–1.80. Frons evenly covered with punctures. Vertex flat, situated on same level as orbit, evenly (not closely) covered with punctures (about 60–80 punctures).

Base of pronotum without short longitudinal impressions. Deep row of large punctures at base of pronotum absent. Pronotal base slightly convex. Area adjacent to mid basal margin of pronotum covered with punctures. Pronotum without shallow antebasal transverse impression. Lateral margins of pronotum slightly convex, more or less parallel to each other. Anterolateral, posterolateral prothoracic callosities poorly developed. Diameter of pronotal punctures slightly larger than distance between adjacent punctures.

Elytra with slightly convex lateral sides. Scutellar row of punctures geminate and confused. Remaining rows of elytral punctures regular. Humeral calli poorly developed.

First male pro- and mesotarsomeres strongly enlarged, obviously larger than those in females. Large lateral denticle on metatibia obtuse. Metatibial serration absent.

Types: 1 (Holotype) ( KMNH): 1) Bangkok, Thailand. 29.xii.1957, T. Umesao Leg. 2) Holotype. 3) C. Chaetocnema (Udorpes) umesaoi Chûjô Det. M. Chûjô, 1959 .

Material: 1♀ ( USNM), India, New Delhi, 23.X.1966, leg. K.E. Gibson, light trap ; 1 ( USNM), India New Delhi, 9.X.1967, KEGibson light trap, Chaetocnema (Udorpes) umesaoi Chûjô det. Yongying Ruan , 2016; 1♂ ( USNM), Thailand: Khon Kaen Municipality Muaklek , DanKakSat, X.13.1953, R. E. Elbel, Chaetocnema (Udorpes) umesaoi Chûjô det. Yongying Ruan , 2016.

Remarks: This species is close to C. paraumesaoi sp. nov., and it can be differentiated from the latter by the following characters: color of femur yellow brown (brown in C. paraumesaoi ), base of pronotum evenly convex (obviously expanded in middle in C. paraumesaoi ), elytra with fewer peri-scutellar punctures, and the differently shaped aedeagus.

Figures

FIGURE 112. Chaetocnema umesaoi. A Holotype, habitus. B Pronotum and peri-scutellar area (Holotype). C Head, frontal view (Holotype). D Aedeagus (Holotype), ventral view. E Aedeagus (Holotype), lateral view. F Apex of aedeagus (Holotype), ventral view.