Chaetocnema (Udorpes) midimpunctata Ruan, Konstantinov & Yang, 2019

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 : 170-172

71. Chaetocnema (Udorpes) midimpunctata Ruan, Konstantinov & Yang , New Species

( Figs. 98 , 99 )

Etymology: This species is named after the pronotum with a narrow longitudinal impunctate area in middle. Specific epithet is a noun in apposition.

Diagnosis: This species is close to C. concinnicollis , C. modiglianii and C. ingenua . It can be easily differentiated from these three species by the punctation of the peri-scutellar area (four confused rows of punctures) and the shape of aedeagus. It also resembles C. westwoodi and can be differentiated by the shorter antennae and smaller body size.

Distribution: China, Vietnam, Thailand, India, Sri Lanka.

Host plants: Unknown.

Description: Body length 2.00– 2.30 mm, body width 1.10–1.23 mm. Ratio of elytron length (along suture) to width (maximum): 2.45–2.50. Ratio of pronotum width (at base) to length: 1.70–1.75. Ratio of length of elytron to length of pronotum (along middle): 3.00–3.05. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): 1.15–1.20. Ratio of maximum width of elytra to maximum width of pronotum: 1.50–1.55.

Color of dorsum variable, commonly bronzy to bronzy brown. Antennae obviously short, just reaching humeral callus. Antennomere 1 yellow, 2–5 partially brown, 6–11 brown, distal antennomeres progressively darkened towards apex. Color of leg slightly variable; generally, anterior and middle legs light brown to pale yellow, metafemora brown to pale yellow.

Head hypognathous. Frontal ridge narrow and flat, with numerous closely placed punctures. Frontolateral sulcus absent. Suprafrontal sulcus present, shallow. Ratio of width of frontal ridge to width of antennal socket (counting surrounding ridges): 1.90–2.00. Frons evenly covered with large, closely placed punctures. Vertex flat, situated on same level as orbit. Surface of vertex densely and evenly covered with punctures (about more than 200 punctures), some specimens (e.g. those from Ceylon) with a narrow longitudinal impunctate area in middle.

Base of pronotum without short longitudinal impressions. Deep row of large punctures at base of pronotum absent. Pronotal base only slightly convex. Area adjacent to mid basal margin of pronotum covered with punctures. Pronotum without shallow antebasal transverse impression. Lateral margins of pronotum convex, strongly converging forward. Anterolateral prothoracic callosity poorly developed, truncate, facing anterolaterally. Posterolateral prothoracic callosity poorly developed. Diameter of pronotal punctures slightly larger than distance between them. An impunctate area present in middle of pronotum.

Elytra with convex lateral sides. Elytral punctures in peri-scutellar area arranged in 4 confused rows. Remaining rows of elytral punctures regular. Humeral callus well developed.

First male protarsomeres as large as those in females. Large lateral denticle on metatibia obtuse. Metatibial serration absent.

Apex of aedeagus in ventral view narrowing abruptly. Ventral longitudinal groove wide in apical half, narrowing towards basal opening. Apical denticle of aedeagus in ventral view well differentiated, short, apex truncate. Apical denticle of aedeagus in lateral view straight. Minute transverse wrinkles on basal part of ventral side of aedeagus absent. Aedeagus in lateral view evenly and strongly curved.

Spermatheca wih pump much shorter than receptacle, with apex flattened. Spermathecal receptacle sinuate. Maximum width of receptacle situated at apex. Apex of vaginal palpus rounded. Vaginal palpus more or less parallel-sided. Anterior sclerotization of vaginal palpus slightly narrowed anteriorly. Posterior sclerotization longer than wide. Posterior sclerotization wider than anterior.

Variability. Color vary from bronzy, bronzy blue, coppery to bronzy brown. Several specimens from Hainan Is., China are with pale yellow appendages and extremely weakly sclerotized aedeagus.

Types: Holotype: ♀ ( USNM), labels: 1) Ceylon, Anu. Dist. Padaviya, 180m, 2–8.XI.1970, O. S. Flint; 2) Chaetocnema (Chaetocnema) singala det. G. Scherer, 1978; 3 ) Holotype C haetocnema midimpunctata sp. nov. des. Ruan, Konstantinov & Yang, 2016.

Paratypes: 1 (IZCAS): 1) China, Hainan, Jian–feng–ling, 750m IZCAS; 2) 1980.III.28 under lamp, Leg. Shuyong Wang; 3) Chaetocnema concinnicollis det. Shuyong Wang; 4) Paratype; 5) paratypes C haetocnema midimpunctata sp. nov. des. Ruan et al., 2017. 11 (IZCAS): 1) China, Hianan, South China Tropical Agricultural University, 150m, 19.50°N, 109.47°E, 2007.V.16 Deyan Ge, IZCAS; 2) PARATYPE; 3) paratypes C haetocnema midimpunctata sp. nov. des. Ruan et al., 2017. 1♀ 1♂ (IZCAS): 1) Vietnam, Tonkin Hoa–bin, leg. A. de cooman; 2) Paratype; 3) Chaetocnema concinnicollis scutellaris sp. nov. Chen; 4) Paratype; 5) paratypes C haetocnema midimpunctata sp. nov. des. Ruan et al., 2017. 1♀ (USNM), Thailand, Khon Kaen, Im Zoo, ad lucem, 26.I.1978, Sunanta Aumphansirl leg.; 2) Paratype; 3) C haetocnema midimpunctata sp. nov. des. Ruan, Konstantinov & Yang, 2016. 1♂ (BMNH) labels: 1) India, Mungpha?? Alkinn... Coll. 92–3; 2) Paratype; 3) C haetocnema midimpunctata sp. nov. des. Ruan, Konstantinov & Yang. 1♂ (USNM), labels: 1) Ceylon, Anu. Dist. Padaviya, 180m, 2–8.XI.1970, O. S. Flint; 2) Chaetocnema (Chaetocnema) singala det. G. Scherer, 1978; 3) Paratype; 4) C haetocnema midimpunctata sp. nov. des. Ruan, Konstantinov & Yang, 2016.

Figures

FIGURE 98. Chaetocnema midimpunctata sp. nov. A Male habitus (Holotype). B Pronotum and peri-scutellar area (Holotype). C Head, frontal view (Holotype). D Aedeagus, ventral view (Paratype). E Aedeagus, lateral view (Paratype). F Apex of aedeagus, ventral view (Paratype). G Vaginal palpi (Paratype). H Spermatheca (Paratype). I Pygidium (tergite 7) of female (Paratype).

FIGURE 99. Chaetocnema midimpunctata sp. nov. A Male habitus (Paratype). B Peri-scutellar area (Paratype). C Head, frontal view (Paratype). D Aedeagus, ventral view (Paratype). E Aedeagus, lateral view (Paratype). F Apex of aedeagus, ventral view (Paratype).