Dromoceryx nigrofovealis sp. n.

Hunting, Wesley & Yang, Man-Miao, 2018, A new genus record and species of Dromoceryx Schmidt-Goebel, 1846 (Coleoptera, Carabidae, Lebiini) from Taiwan, with a revised key to species, ZooKeys 803, pp. 121-130 : 121

Dromoceryx nigrofovealis sp. n. Figs 1, 2 A–D, 3, 4

Etymology.

The name of this species refers to the foveae of the lateral umbilical seta, which is piceous to black.

Type material.

HOLOTYPE, male, labeled: "TAIWAN: Kaohshiung City / Maolin dist., Chung-Shin vill. / Liouguei Research Center / 22.9709N, 120.6822E "; "m.v. light sheet / 670m, Acc. Ti-209a / April 14, 2014, Y. Weng / D. Hwang & W. Hunting" [NCHU]. 35 PARATYPES, sex and label data follows. 1 male, labeled same as holotype [NCHU]. 1 female, "TAIWAN: Kaohshiung City / Maolin dist., Chung-Shin vill. / Liouguei Research Center / 22.9709N, 120.6822E "; "hand coll., April 15, 2014 / 640m, Acc. Ti-210d / Y.M. Weng, D. Hwang / & W. M. Hunting" [NCHU]. 2 males, 4 females, "TAIWAN: Kaohsing. / Shanping., 640 m / 1-10 April 1998/ R. Davidson, J. Rawlins / C. Young" [CMNH]. 3 males, 2 females, "TAIWAN: Kaohsing./ Shanping., 640 m / 21-30 April 1998 / C. Young, R. Davidson / J. Rawlins" [CMNH]. 4 males, 3 females, "TAIWAN Hengchun / Kenting Park/ IV / 7-8/2004 / C.S. Lin & W.T. Yang / UV Light trap" [NMNS]. 1 male, 1 female, "TAIWAN Hengchun/ Kenting Park / II/16-17/2005 / C.S. Lin & W.T. Yang / UV Light trap" [NMNS]. 4 males, 2 females, "TAIWAN: Tainan Co. / Mt. Kantou Trail / (崁頭山步道) by light/ 2014.III.29. leg. 賴保成 / 23°15'36.55"N, 120°30'00.85"E [NCHU]. 4 males, 3 females, " TAIWAN: Pingdong Co. / Kenting Forest Research / Area (墾丁森林遊樂區) / 2010.V.15 by light"; "2010-5-15-Kenting Forest / Recreation Area (墾丁森林/ 遊樂區) - Light trap / - Coleoptera - 53"; leg. 邱垂生 & 藍艷秋 / 21°57'48.6"N, 120°48'47.9"E / #372" [LAN].

Type Locality.

Maolin District, Kaohshiung City, Taiwan.

Diagnosis.

This species is readily distinguished from other Dromoceryx species by the combination of: head and pronotum piceous to black and lateral margins with foveae of umbilical setae piceous. Individuals of this species also have an elytral macula pattern that is less variable when compared to specimens of D. dorsalis ( Mateu 1984).

Description.

OBL 3.52-4.08 mm. Length (n = 10 males, 10 females): head 0.32-0.44, pronotum 0.60-0.72, elytra 2.10-2.42, metepisternum 0.56-0.60 mm; width of head 0.82-0.96, of pronotum 1.04-1.20, of elytra 1.66-1.92, of metepisternum 0.32-0.40 mm.

Body proportions.HW/HL 2.10-2.56; PWM/PL 1.63-1.77; EL/EW 1.25-1.33; ML/MW 1.50-1.75 mm.

Color. Fig. 1. Dorsum of head piceous, clypeus with base piceous, apical margin brunneous, labrum brunneo-piceous to brunneous, darker centrally; palpi and antennae brunneo-testaceous to brunneous; elytral disc piceous to black, margins brunneous, paler; elytral disc testaceous, lateral margins with foveae of several umbilical setae piceous, disc with two large piceous macula, joined along suture to appear as one large macula, macula long, extending from base to apical 1/6th of elytra. At base of elytra, from suture to stria 6, narrowing to stria 4 in basal 1/3rd and then expanding to interval 8 medially, constricting again just beyond 2/3rds length to stria 5; ventral surface distinctive, apex of prosternal and mesosternal coxal process testaceous, metepisternum and pregentinal sterna III and IV testaceous medially, apical margin of pregenital sternum VII brunneous to testaceous, proepipleuron testaceous, legs testaceous, all other surfaces brunneo-piceous to piceous.

Microsculpture. Dorsum of head with mesh pattern isodiametric to slightly stretched longitudinally; pronotum with microsculpture almost isodiametric medially to somewhat transverse laterally, cells 1.5 –2× wider that long; elytra with sculpticells transverse; ventral surfaces with microsculpture transverse.

Macrosculpture and pilosity. Dorsum of head smooth, with a few very fine punctures, hardly visible at 50 ×. Pronotum smooth, with very fine, randomly scattered setigerous punctures, hardly visible at 50 ×; elytral intervals with ± single row of very fine, setigerous punctures along length, hardly visible at 50 ×; stria with few faint punctations, setae not visible at 50 ×; ventral surface with very fine, randomly scattered setigerous punctures.

Fixed setae. Two pairs of supraorbital setae; clypeus with two lateral setae; labrum with six setae along apical margin; pronotum with two setae along each margin, one at base of lateral margin and one on lateral margin at pronotum maximal width; elytra with two setae in interval 3, one seta just before mid-length, one seta in apical 1/3rd; 11-12 lateral (umbilical) setae in interval 9; two setae on each of abdominal sterna III to VI; two setae along apical margin of sternum VII in males, females with four setae near apical margin of sternum VII, medially setae much shorter and finer than outer setae.

Luster. Dorsum of head and pronotum moderately dull; elytra moderately glossy; ventral surface moderately glossy.

Head. Mandibles short, with wide base; labrum wider than long, rectangular; mentum with shallow tooth; eyes somewhat convex.

Pronotum. Anterior transverse impression very shallow; posterior transverse impression very shallow; median longitudinal impression moderately shallow; disc moderately flat, basal angles obtuse, lateral margins broadly rounded, margins narrow.

Elytra. Intervals moderately flat, striae moderately impressed; elytral apices truncate.

Hind wings. Macropterous.

Legs. Claws pectinate, 4 or 5 denticles per claw. Male protarsi with adhesive vestiture ventrally, two rows of squamo-setae on tarsomeres 1-3 of fore-leg.

Male genitalia. Fig. 2 A–D. Length 0.84-0.92 mm. Ostium catopic, long, slightly more to left side in ventral view; phallus cylindrical, left side narrowing from mid-length to apex, right side relatively straight in ventral view, apex narrow, rounded, sharply pointed in lateral view; endophallus short and wide, several patches with microtrichia slightly enlarged and more sclerotized than remaining surface, visible in non-everted specimens.

Female genitalia. Fig. 3. Width 0.56-0.64 mm. Gonocoxite 2 (gc2) slightly spatulate, broadly rounded at apex; two lateral ensiform setae (les), one on each side, seta-like as opposed to spine-like, two nematiform setae (ns) at apex; one spermatheca (sp1), cylindrical and elongate, right angled at mid-length, ribbed texture from mid-length to apex; one spermathecal accessory gland (sg), spermathecal gland duct (sgd) with irregular width along length, attachment site at base of spermatheca.

Habitat, habits and seasonal occurrence.

The known elevational range of D. nigrofovealis is from 240 to 670 m. Adults of this species live in mixed primary and secondary forests. Adults are crepuscular or nocturnal and readily come to light. All known specimens have been collected from February to May. Collecting methods include ultraviolet light, mercury vapour light sheet, incandescent light, and hand collecting.

Geographical distribution.

To date, this species is known from a few localities in the southern third portion of Taiwan (Fig. 4).