Dacne (Xenodacne) tangliangi Dai & Zhao

Dai, Cong-Chao & Zhao, Mei-Jun, 2013, Two new species of Dacne Latreille (Coleoptera, Erotylidae) from China, with a key to Chinese species and subspecies of Dacne, ZooKeys 261, pp. 51-59 : 52-53

Dacne (Xenodacne) tangliangi Dai & Zhao sp. n. Figs. 1, 23-919

Type material.

Holotype:CHINA: Yunnan Prov.: ♂, Nabanhe N.R., Bengganghan, Nanmugahe, 22°06'N, 100°27'E, alt. 1700 m, 13.XI.2008, H Jia-Yao & TANG Liang leg. (SHNU). Paratypes:CHINA: Yunnan Prov.: 4♂♂, 4♀♀, same data as holotype (SHNU); 1♂, 1♀, same data as holotype (FSCA).

Description.

Body (Fig. 1, 2) stout, elongate, length: 2.8-3.1 mm; width: 1.29-1.40 mm. Head and elytra black; pronotum general black with reddish-brown sides; legs, palpi and base of antennae reddish-brown; antennal club dark brown. Each elytron with two orange bands.

Head width between eyes = 4 times eye diameter in dorsal view; punctation coarse, sparse, separated by 3-4 puncture diameters; epistome truncate, lacking marginal line on anterior margin; stridulatory files not evident. Antennae (Fig. 9) long, extending behind posterior border of pronotum; antennomere III about 1.4 times as long as IV; antennomere VIII slightly wider than VII, about 1.2 times as wide as long; antennomere IX trapezoidal; antennomere X transverse; antennomere XI almost elliptic; relative lengths of antennomeres II–XI: 12.5: 13.5: 8.5: 8.0: 8.0: 8.0: 8.0: 11.0: 11.0: 14.0. Maxillary and labial terminal palpomeres acuminate, sensory area restricted to apex. Mentum broad with anterior projection, almost triangular, slightly more than 2 times wider than long.

Pronotum arched, widest at base (pl/pw = 0.61-0.65); slightly narrowing toward apex; lateral margin thickened anteriorly; pronotal anterior margin normal, not projecting forward beyond anterior angles (typical for the subgenus Xenodacne ). Pronotum distinctly punctured medially, finely and closely punctured laterally.

Prosternum with anterior edge straight, lacking marginal bead; posterior process broad, width more than diameter of procoxa; prosternal lines apparently lacking; punctures coarse and close, diameter = eye facet, separated by 1-2 puncture diameters. Abdomen with distinct coxal lines on first ventrite nearly attaining posterior margin. Legs with tibia not dilated at apex.

Scutellum pentagonal, finely and sparely punctured.

Elytra margined basally; widest at middle, then gradually narrowing to apex; with fine punctures.

Male genitalia (Fig. 3, 4) moderately curved; median lobe short, apically pointed; median strut long, about 1.8 times as long as median lobe. Tegmen with parameres long, flattened, tightly fitting basal piece and each other. Internal sac simple (Fig. 5).

Female genitalia (Fig. 6, 7) with reduced stylus; coxite apically and curved terminally, chisel-like, length nearly equal to valvifer; paraproct narrowed apically; female spermatheca (Fig. 8) with head almost round shaped.

Distribution.

China (Yunnan Province).

Diagnosis. Dacne tangliangi is most similar to Dacne (Xenodacne) maculata Chûjô due to similar form and color pattern of the body. Dacne tangliangi can be distinguished from Dacne maculata by the black pronotum, scutellum not transverse (length/width<1.5), posterior band in elytron not extending to the border and occurs in southwest China. Dacne maculata has a reddish pronotum, scutellum transverse (length/width>1.5), posterior band in elytron extending to the border and occurs in Japan and Siberia ( Chûjô and Chûjô 1988).

Etymology.

This species is named in honor of Mr. Liang Tang, collector of the new species and teacher of the senior author.