Chaetocnema (Udorpes) belli Jacoby, 1904

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 : 139-140

56. Chaetocnema (Udorpes) belli Jacoby, 1904

( Fig. 79 )

Chaetocnema belli Jacoby 1904: 392 . TL: India, Khandesh. TD: BMNH. Lectotype designated here.

Distribution: Vietnam (new record), Thailand, India, Bhutan (new record), Nepal (new record), Pakistan (recorded here and in E. Pakistan by Nadein et al. (2012)).

Host plants: Alternanthera sp. ( Amaranthaceae ) ( Reddy et al., 1980). Brassica sp. (new record based on BMNH specimens).

Description: Body length 2.30–2.65, body width 1.40–1.50. Ratio of elytron length (along suture) to width (maximum): 2.60–2.70. Ratio of pronotum width (at base) to length: 1.50–1.55. Ratio of length of elytron to length of pronotum (along middle): 2.50–2.75. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): 1.10–1.20. Ratio of maximum width of elytra to maximum width of pronotum: 1.30–1.40.

Elytra, pronotum and head coppery to bronzy. Antennomeres 1–4 completely yellow, 5–11 yellow brown, tibiae and tarsi yellow. Pro- and mesofemora yellow brown, metafemora reddish brown.

Head hypognathous. Frontal ridge moderately wide and flat. Frontolateral sulcus absent. Suprafrontal sulcus relatively deep, well recognized. Suprafrontal sulcus obcordate. Ratio of width of frontal ridge to width of antennal socket: 1.95–2.00. Frons evenly covered with relatively short white setae. Vertex flat, situated on same level as orbit, densely and evenly covered with punctures.

Base of pronotum without short longitudinal impressions. Deep transverse row of large punctures at base of pronotum absent. Pronotal base evenly convex. A narrow area adjacent to mid basal margin of pronotum impunctate or sparsely punctate. Pronotum without shallow antebasal transverse impression. Lateral margins of pronotum slightly convex, converging forward. Pronotum strongly convex; anterolateral prothoracic callosity moderately developed, invisible in dorsal view. Posterolateral prothoracic callosity poorly developed. Diameter of pronotal punctures 2 to 4 times smaller than distance between punctures. Elytra with convex sides. Scutellar row of elytral punctures regular and single. Second to eleventh rows of elytral punctures regular. Humeral callus well developed.

Large lateral denticle on metatibia sharp. Metatibial serration proximal to large lateral denticle absent. Metatibia proximad to denticle in dorsal view convex.

Apical third of aedeagus narrowed in lateral view. Apex of aedeagus in ventral view narrowing gradually, with lateral margin curved unevenly. Ventral longitudinal groove of aedeagus moderately developed. Apical denticle of aedeagus in ventral view well differentiated, short, flat on top. Apical denticle of aedeagus in lateral view strongly curved ventrally. Minute transverse wrinkles on ventral surface of aedeagus absent. Aedeagus in lateral view evenly and moderately curved.

Spermatheca with receptacle sinuated and strongly narrowed basally. Receptacle basally narrower than apically. Posterior sclerotization longer than wide. Posterior sclerotization wider than anterior.

Types: Lectotype: 1♀ ( BMNH), labels: 1) Type H.T. 2) T.R. Bell, Khandesh; 3) Jacoby Coll. 1909–28 a, Chaetocnema belli Jac. ; 4) Examined K. Prathapan 2005; 5) Examined Ruan Yongying 2014; 6 ) Lectotype Chaetocnema belli Jacoby, 1892 Des. Ruan et al., 2016 .

Paralectotype: 1♀ ( BMNH), labels: 1) T.R. Bell, Khandesh; 2) Type. 3) Examined K. Prathapan 2005; 4) Exam- ined Ruan Yongying 2014; 5 ) Paralectotype Chaetocnema belli Jacoby, 1892 Des. Ruan et al., 2016 .

Material: 1♀ ( BMNH), Vietnam, Tonkin: Thai–Nien. Bank of Fleuve Rouge., 1924, H. Stevens; 1 ( BMNH), NW Thailand, 1991, 18. 26° N, 98. 41° E, Chom…(illegible), 24.–27.4., L. Dembicky leg., BMNH(E), 2002–150, Chaetocnema belli Jacoby, 1904 , Det. Yongying Ruan, 2016; 1 ( BMNH), Punakha, Bhutan, 4 Aug. 1987, M. Bigger, 646, feeding on Brassica ‘Fulmeir’, C.I.E. A19398, Chaetocnema sp. det. M. L. Cox, 1988, Pres by Comm Inst Ent, B. M. 1988–1, Chaetocnema belli Jacoby, 1904 , Det. Yongying Ruan, 2016. 1♀ ( USNM), Bhutan, Damphu 16.IX.2005, wp–108, leg. K. Mahat, P. Loday, A. Konstantinov & K. D. Prathapan; 1 ♂ ( BMNH), Nepal: 4500’, Kathmandu, British Embassy, 20.v.–23.vi.1983, M. J. D. Brendell, B. M. 1983–222, At light, Chaetocnema sp. det. K. Nadein 2007, (near.) Chaetocnema belli Jac., Det. Yongying Ruan, 2016 ; 1♀ 5♂ ( USNM), India, New Delhi, 23.X.1966, leg. K.E. Gibson, light trap; 1♂ ( USNM), India, New Delhi 13.X.1967, KE Gibson, light trap; 1♂ ( USNM), India, Delhi, X.1958, NLH Krauss, Loan from USNMNH 2065634; 1♀ ( USNM), India, Madhya Prad., Jabalpur, 20– 21.9.1968, K. E. Gibson, Loan from USNMNH 2065634; 1♀ ( BMNH), India, Poona, 22.VIII.1944, D. Leston, B. M., 1946–365. 5 ( USNM), India, New Delhi, X.1966, KE Gibson light trap, Chaetocnema sp. det. A. Konstantinov, Chaetocnema belli det. Yongying Ruan, 2016; 2 ( USNM), India, New Delhi, X.1967, KEG ibson light trap, Chaetocnema sp. det. A. Konstantinov, Chaetocnema belli det. Yongying Ruan, 2016; 1 ( BMNH), Belgaum ( India), 756, Andrewes, Bequest, B. M. 1922–221, Chaetocnema belli Jacoby, 1904 , Det. Yongying Ruan, 2016; 1 ( USNM), Pakistan: Punj., 16miW Hasanabdal, 1450 feet, 10. October, 1977, collectors: Gary F. Hevel & Mushtaq Ahmad, Loan from USNMNH 2065634, Chaetocnema belli det. Yongying Ruan, 2016.

Remarks: Body shape is variable in C. belli as some specimens are narrow, while some others are quite broad, however, all the specimens have identical aedeagus. Chaetocnema belli is close to C. angustifrons sp. nov. and it can be differentiated from the latter by the following characters: pronotum, head and vertex broader; distance between eyes much larger; male with first protarsomeres broader.

Figures

FIGURE 79. Chaetocnema belli. A Male habitus. B Pronotum. C Head, frontal view. D Aedeagus, ventral view. E Aedeagus, lateral view. F Apex of aedeagus, ventral view. G Vaginal palpi. H Spermatheca. I Pygidium (tergite 7) of female.