Chaetocnema (Chaetocnema) yiei Kimoto, 1970

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 : 121-122

48. Chaetocnema (Chaetocnema) yiei Kimoto, 1970

( Fig. 70 )

Chaetocnema yiei Kimoto, 1970: 208 . TL: Taiwan. TD: KUZC.

Chaetocnema ebenina Warchalowski, 1973: 47 . TL: Cha Pa, Laokay, Vietnam. TD: Warchalowski collection. (Syn. Nov.)

Distribution: China (Taiwan), Vietnam, India.

Host plants: Unknown.

Description: Body length: 1.65–1.85 mm. Body width: 0.95–1.10 mm. Ratio of length of antenna to length of body: 0.55–0.65 mm. Ratio of elytron length (along suture) to width (maximum): 2.20–2.25. Ratio of pronotum width (at base) to length: 1.75–1.80. Ratio of length of elytron to length of pronotum (along middle): 2.65–2.70. Ratio of width of elytra at base (in middle of humeral calli) to width of pronotum at base: 1.04–1.06.

Dorsum brown, with coppery luster.

Head hypognathous. Frontal ridge wide and flat, without punctures. Frontolateral sulcus present. Suprafrontal sulcus poorly developed. Orbital sulcus deep. Ratio of width of frontal ridge (excluding margin) to width of antennal socket (excluding margin): 2.00–2.15. Number of punctures on vertex: 7–8 on each side near eye. Number of punctures on orbit: 0–1 on each side. Number of punctures on frons (triangular area surrounded by frontolateral sulcus and clypeus): 0. Number of setae on clypeus: approximately 25. Number of setae on labrum: 6. Anterior margin of labrum slightly convex in middle.

Pronotum without longitudinal impressions near basal margin. A deep row of large punctures present at base of pronotum. Pronotal base evenly convex. Lateral margins of pronotum slightly convex, converging forward. Anterolateral prothoracic callosity somewhat truncate, weak. Posterolateral prothoracic callosity poorly developed. Pronotal punctures distinctly longitudinal, sparse and minute.

Elytra with lateral sides slightly convex. Elytral punctures larger than those on pronotum, arranged in single rows, scutellar row regular and single. Interspaces between striae of punctures smooth and glabrous. Number of rows of minute punctures on each interspace: 2. Humeral callus well developed.

First male protarsomere slightly larger than second.

Apex of aedeagus in ventral view narrowing gradually. Ventral longitudinal groove absent or pooly developed. Apical denticle distinct, weak, rounded. Minute transverse wrinkles on ventral side absent. Aedeagus in lateral view moderately curved at base, almost straight near apex.

Types: ♂ (Holotype) ( KUEC): 1) ( Taiwan) Nanshanchi Nantou Hisien ; 2) 30.vi.1965 S. Kimoto; 3) Japan—U. S. Co–op. Sci. Programme; 4) Holotype; 5) Chaetocnema (Tlanoma) yiei Kimoto , sp. nov.

1♂ 2♀ (Paratypes) ( KMNH), 1) 30.vi.1965, S. Kimoto; 2) ( Taiwan) Nanshanchi Nantou Hisien; 2) 30.vi.1965 S. Kimoto; 3) Japan—U. S. Co–op. Sci. Programme; 4) Paratopotype; 5) Chaetocnema (Tlanoma) yiei Kimoto , sp. nov .

Material: 3 ( BMNH), H. L. Andrewes, Nilgiri Hills ( India), Andrewes, Bequest, B. M. 1922–221, (near) Chaetocnema yiei Kimoto, 1991 , Det. Yongying Ruan, 2016.

Remarks: C. yiei resembles C. nigrilata sp. nov., and it can be differentiated from the latter by smaller size ( C. yiei 1.65–1.85 mm; C. nigrilata 1.85–1.95 mm), lighter body color, and aedeagus slender in lateral view.

Despite concerted efforts, we could not examine the type of C. ebenina . However, based on the original description and illustration of aedeagus provided by the author ( Warchalowski, 1973), we synonymize C. ebenina with C. yiei .

Figures

FIGURE 70. Chaetocnema yiei. A Holotype, habitus. B Pronotum and peri-scutellar area of Holotype. C Head of Holotype, frontal view. D Aedeagus (Paratype), ventral view. E Aedeagus (Paratype), lateral view. F Apex of aedeagus (Paratype), ventral view. G Vaginal palpi (Paratype). H Spermatheca (Paratype). I Pygidium (tergite 7) of female (Paratype).