Nacerdes (Xanthochroa) arcuata, Tian, Ying, Ren, Guo-Dong & Li, Qiang, 2014

Tian, Ying, Ren, Guo-Dong & Li, Qiang, 2014, Taxonomy of the Nacerdes (Xanthochroa) carniolica species-group from China (Coleoptera, Oedemeridae, Nacerdini), ZooKeys 426, pp. 111-118 : 114

Taxon classification Animalia Coleoptera Oedemeridae

Nacerdes (Xanthochroa) arcuata sp. n. Figs 2-3, 5-11

Type material.

Holotype: male (MHBU): China, Anhui Province, She County, Qingliangfeng N. R., alt. 320 m, 30°02'17.37"N, 118°50'1.72"E, 5-9.vi. 2013, Ji-Shan Xu & Cai-Xia Yuan leg. Paratypes: 2 ♂♂, 8 ♀♀ (MHBU), same data as holotype.

Diagnosis.

This new species belongs to the Nacerdes (Xanthochroa) carniolica species-group as defined by Švihla (1998) according to the shape of the aedeagus, it is similar to Nacerdes (Xanthochroa) hiromichii Švihla, 2004, but can be distinguished from the latter by its smaller body, black head, basal 2/3 of each femur saffron yellow, the rest of each leg sepia to black, and the different shape of aedeagal apicale.

Etymology.

The specific name is derived from the Latin adjective arcuatus, meaning arched, referring to the characteristic shape of aedeagus in this species.

Description.

Body length 10.3−12.7 mm, body width 2.1−2.7 mm. Head black, maxillary palpi sepia to black. Antennae black, antennomeres gradually lightening to sepia. Basal 2/3 of femora saffron yellow, terminal portion of femora, tibiae and tarsi sepia to black. Pronotum, abdomen and elytra saffron yellow to terra-cotta, apex of each elytron black with dark blue metallic tinge.

Male (Fig. 2). Eyes large, protruding, head across eyes slightly wider than pronotum, frons between eyes 1.8 times as wide as length of antennomere II. Maxillary palp as in Fig. 5. Antennae slightly exceed 1/2 of elytral length, antennomere I more than twice as long as antennomere II, as long as antennomere III, dorsal surface of head and pronotum finely and sparsely punctate and yellow pubescence. Pronotum moderately longer than wide, slightly cordiform, both anterior and posterior pronotal depressions slightly to moderately developed, anterior margin straight, anterior corners rounded, lateral margins moderately sinuate, posterior corners obtuse, posterior margin moderately straight. Elytra nearly parallel-sided, matt, only their dark blue apex lustrous, elytra about four times longer than wide, elytral nervation developed. Both pygidium and last sternite subtriangular, pygidium rounded apically, last sternite incised to 2/3 of its length as in Fig. 8, projections of urite VIII as in Fig. 6. Tegmen (Fig. 7) slightly longer than half of aedeagus, aedeagal apicale as in Figs 10-11.

Female (Fig. 3). Head across eyes as wide as pronotum, frons between eyes twice as wide as length of antennomere II, antennae almost reach elytral midlength, pronotum as long as wide, last abdominal segments as in Fig. 9.

Distribution.

China: Anhui.