Chaetocnema (Chaetocnema) longipunctata Maulik, 1926

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 : 73-74

23. Chaetocnema (Chaetocnema) longipunctata Maulik, 1926

( Fig. 44 )

Chaetocnema longipunctata Maulik, 1926: 205 . TL: Ceylon. TD: BMNH. Lectotype designated here.

Distribution: Brunei ( Mohamedsaid, 2004), Sri Lanka ( Maulik, 1926).

Host plants: Unknown.

Description: Body Length 2.05–2.25 mm, body width 1.20–1.30 mm. Ratio of elytron length (along suture) to width (maximum): 2.20–2.30. Ratio of pronotum width (at base) to length: 1.60–1.65. Ratio of length of elytron to length of pronotum (along middle): 2.40–2.50. 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: 1.40–1.45.

Elytra and pronotum black, without metallic luster. Antennomeres 1–6 completely yellow, 7–11 light brown to brown. Tibiae yellow. Pro- and mesofemora partly brown.

Head hypognathous. Frontal ridge wide and convex. Frontolateral sulcus present. Suprafrontal sulcus deep laterally, shallow in middle. Ratio of width of frontal ridge to width of antennal socket: 2.20–2.40. Frons with relatively long setae only laterally. Vertex flat, with minute microsculpture, situated on same level as orbit. Vertex with 8–12 punctures aggregated on either side near eye. Labrum wider than long, anterior margin distinctly concave forming obtuse angle anterolaterally.

Base of pronotum without short longitudinal impressions. Deep row of large punctures at base of pronotum present. Pronotal base slightly expanded in middle. Area near middle of basal margin of pronotum covered with punctures. Lateral margins of pronotum slightly convex, converging forward. Anterolateral prothoracic callosity weak, protruding forward. Posterolateral prothoracic callosity poorly developed. Punctures on pronotum long. Length of pronotal punctures subequal to distance between adjacent punctures. Width of pronotal punctures about 2–4 times less than distance between them.

Elytra with convex sides. Elytra slightly costate dorsally, strongly costate laterally. Peri-scutellar punctures regular, form single row. Second to eleventh rows of punctures regular. Humeral callus well developed.

Large lateral denticle on metatibia sharp. Excavation on tibia moderately developed. Metatibial serration proximal to large lateral denticle present, poorly developed.

Type: Lectotype: 1♀, 1) Halupahani , Haldummulle, Ceylon, 1904–171; 2) Chaetocnema longipunctata M., S. Maulik det., Type, 1926; 3 ) Lectotype Chaetocnema longipunctata Maulik, 1926 Des. Ruan et al., 2016 .

Remarks: C. longipunctata closely resembles C. nigrilata sp. nov, but differs from C. nigrilata sp. nov by having fewer punctures on either side of vertex and much denser punctures on pronotum. It differs from C. yiei by the distinctly elongate punctures on pronotum.

Figures

FIGURE 44. Chaetocnema longipunctata. A Male habitus (Holotype). B Peri-scutellar area of elytra (Holotype). C Head, frontal view (Holotype), red arrow indicating anterolateral angle of labrum. D Pronotum (Holotype).