Micrencaustes (Mimencaustes) acridentata, Li & Ren, 2006

Li, Jing & Ren, Guo-Dong, 2006, Description of a new species of Micrencaustes (subgenus Mimencaustes Heller) (Coleoptera: Erotylidae: Encaustini) from China, Zootaxa 1176 (1), pp. 53-58 : 54-57

Micrencaustes (Mimencaustes) acridentata new species ( Figs. 2–14 )

Type material

Holotype male, CHINA: Yunnan Province, Xishuang Banna Dai nationality Autonomous Prefecture , N 22°5’ E 101°3’, 16 April 1958, F.L. Li leg. Paratypes: CHINA: Guangxi Province, Longlin County, N 24°35’ E 104°52’, one female, 10 October 1993, Z.H. Jiang leg. ; CHINA: Yunnan Province, Jinping County, N 22°56’ E 103°16’, one female, 14 April 1956, K. R. Huang leg.

Diagnosis

This new species is allied to Micrencaustes (Mimencaustes) taiwana Araki from Taiwan Province of China. The major differences are listed in Table 1.

Etymology

acri: Latin = sharp, acute; dentate: Latin = spine, tooth. This name refers to the sharp spine at apex of middle tibia.

Description

Body moderately elongate, length: 14.0– 15.5mm, width: 5.5–6.0mm (bl/bw = 2.50–2.58; average = 2.54, Fig. 15 ); widest at base of elytra, general color dark, slightly

shining. Pronotum ( Fig. 3 ) with two longitudinal, curved orange marks, each bearing a short branch in the middle.

taiwana Nakane.

Head ( Fig. 2 ) dorsal distance between eyes = 1.87× eye width; ocular striae reaching 0.5 distance to anterior angle of eye; vertex puncture size = 0.5 to 0.75× eye facet diameter, separated by 2 to 3 puncture diameter; epistome puncture size = 1.0× eye facet diameter, separated by 0.5 to 1.0 puncture diameter. Antenna ( Fig. 6 ) reaching basal 0.2 of pronotum; antennonere III as long as next 2 antennomeres combined; antennomere IX asymmetrical, almost triangular; antennomeres X to XI symmetrical; antennomere XI subcircular, narrower than antennomere X. Maxillary palp terminal segment ( Fig. 7 ) triangular, sides rounded, lateral angle acute, medial angle 90° or more, length = 0.35× width. Labial palp terminal segment ( Fig. 8 ) triangular, extended medially, sides rounded, angles nearly 90°, width = 0.86× length; Labial palp width = 0.34× maxillary palp width. Mentum with plate triangular, sides concave; ridge medial extension short and bluntly pointed.

Pronotum ( Fig. 3 ) widest at base (pl/pw = 0.71–0.76; average = 0.74); lateral edge slightly curved, strongly margined; anterior edge straight, margined only behind eyes; basal edge weakly sinuate, lacking margin. Pronotum finely punctate, punctures evenly scattered, separated by 3.0 to 5.0× punctures diameter, size = 0.3× eye facet diameter, or less; often with a basal group of coarse puncture, size usually = 1.5× eye facet diameter. Pronotal angle pore present, small; anterior angle pore ventral to marginal line and posterior of angle; posterior angle pore in marginal line; anterior angles projecting.

Scutellum broadly pentagonal, length = 1.87× width.

Elytra (el/ew = 1.68–1.80; average = 1.73), widest near base. Each elytron with 8 complete striae; strial punctures at base of striae VI, VII, and VIII = 2.0× pronotal disc punctures; punctures of striae II, III and IV = 5.0× pronotal disc punctures, gradually becoming finer posteriorly; intervals finely punctured.

Prosternum ( Fig. 4 ) triangular between the coxae, produced into a blunt point at the anterior margin, and distinctly depressed in the middle, and emarginated behind; coxal lines straight, length= 0.5× sternal length, lines converging anteriorly and surpassing coxae.

Mesoventrite ( Fig. 5 ) broad, with a median quadrate depression; distance between mesocoxae = 1.28× coxal diameter; mesocoxal lines short; sternum with fine and sparse punctures.

Metaventrite broad, distance between meta­ and mesocoxa = 2.5× mesocoxal diameter; sternum with medial punctures coarse, a few fine lateral punctures.

Mesotibia ( Fig. 15 ) with outer edge of apex acutely toothed.

Male genitalia ( Fig. 9 ) with median lobe weakly curved; narrowed to a point; median strut length = 1.28× median lobe length; flagellum short, length = 0.85× median lobe length; sclerite at anterior end of flagellum as in Fig.10–11 .

Female genitalia ( Fig. 12–13 ) with narrow styli at apex of coxite, and styli rounded apically, covered with setae at apex. Female spermatheca as in Fig.14 .

Distribution China: Yunnan, Guangxi.

Figures

FIGURES 15. Micrencaustes (Mimencaustes) acridentata sp. nov.

FIGURES 2–14. Micrencaustes (Mimencaustes) acridentata sp. nov. 2, head; 3, pronotum; 4, prosternum; 5, mesoventrites; 6, antenna; 7, maxillary palp terminal segment; 8, labial palp terminal segment; 9, male genitalia in lateral view; 10–11, lateral and dorsal views of the sclerotized muscle attachment at anterior end of male fagellum. 12–13, female genitalia in ventral and dorsal views; 14, female spermatheca. Scale bar: 2–6, 9, 12–14, 1.00mm; 7–8, 10–11, 0.50mm.