Dolichoctis badiadorsis, Hunting, Wesley & Yang, Man-Miao, 2019

Hunting, Wesley & Yang, Man-Miao, 2019, A taxonomic review of the pericaline ground-beetles in Taiwan, with descriptions of new species (Coleoptera, Carabidae, Lebiini), ZooKeys 816, pp. 1-164 : 84-88

Dolichoctis badiadorsis sp. n. Figs 61, 62 A–D, 63, 71A, 72

Etymology.

From Latin badia and dorsis, in reference to the relatively uniform, reddish brown coloration of the dorsal surface.

Types and other material examined.

Holotype (male) labeled: “Holotype” [circular, ringed with red]; "TAIWAN: Taichung Co./Dakeng Scenic Area/base of hiking trail 4/24.1737N, 120.7882E"; "veg. nr. lights on trail/night. Acc. Ti-85/May 25, 2011, 475m/Coll. W. M. Hunting"; " NCHU# 101165". 64 paratypes: 25 males and 40 females. For further details see EH Strickland Virtual Entomology Museum Database.

Type locality.

Taiwan. Nantou county, Dakeng Scenic Area.

Taxonomic note.

Dolichoctis badiadorsis appears to be closely related to D. jacobsoni Anderewes (1929), which is known from Vietnam, Sumatra, Java, and Borneo. It is easily distinguished from D. jacobsoni by the following differences: pronotum brunneo-testaceous to rufo-brunneous and with basal and apical width equal in length; elytra with faint apical macula extending to suture (2nd to 5th interval in D. jacobsoni ); phallus with shaft uniformly narrowing towards apex in lateral view, apex in the form of a more spatulate hook; endophallus with spines of spine patch with different placement and number of spines.

Diagnosis.

Specimens of this species are easily distinguished from other species of Dolichoctis by a combination of the absence of elytra with only very faintly visible macula and a head and pronotum that is only somewhat lighter in coloration than head.

Description.

OBL 4.33 - 5.33 mm. Length (n = ten males, ten females): head 0.44 - 0.56, pronotum 0.72 - 0.96, elytra 2.58 - 3.33, metepisternum 0.56 - 0.76 mm; width: head 0.92 - 1.08, pronotum 1.36 - 1.64, elytra 2.08 - 2.50, metepisternum 0.36 - 0.48 mm.

Body proportions. HW/HL 1.85 - 2.18; PWM/PL 1.59 - 1.83; EL/EW 1.11 - 1.36; ML/MW 1.40 - 1.90.

Color. Fig. 61. Dorsum of head brunneous, clypeus and labrum brunneous, typically slightly lighter, antennae and palpi testaceous to brunneous; disc of pronotum brunneo-testaceous to rufo-brunneous, margins rufo-testaceous to brunneo-testaceous, always lighter than disc; elytral disc rufo-brunneous to brunneo-piceous, iridescent, most specimens with four very faint macula, slightly lighter than disc, two anterior and two posterior, anterior macula near humerus, from interval 4 to interval 8 more or less ovoid, posterior macula extended from suture to interval 5 or 6, forming single oval apically, across center of disc; lateral margins brunneo-testaceous to brunneous, somewhat translucent and slightly lighter than disc; ventral surface brunneo-testaceous to brunneous, metepisternum darker, apical margin of abdominal sterna darker; legs with trochanter and femora brunneo-testaceous, tibia with dorsal surface partially piceous.

Microsculpture. Dorsum of head with microsculpture granulate, almost isodiametric in front of eyes, somewhat transverse behind eyes, easily visible at 50 × magnification; pronotum with shallow, transverse mesh pattern.

Macrosculpture. Elytra with intervals somewhat convex.

Fixed setae. Elytra with interval 3 with two punctures bearing fine setae, first near mid-length and second ~2/3 to apex.

Luster. Head capsule moderately dull; pronotum and elytra moderately glossy; ventral thoracic sterna and abdominal sterna moderately glossy.

Head. Labrum more or less rectangular, some specimens slightly emarginated.

Pronotum. Disc rather flat, anterior transverse impression shallow; posterior transverse impression shallow; median longitudinal impression moderately shallow; lateral margins explanate, apico-lateral margins rounded forming lobes, posterio-lateral margins typically broadly rounded, obtuse.

Elytra. Hind angles nearly truncate.

Male genitalia. Figs 62 A–D, 63. Length 0.88 - 0.96 mm. Ostium left pleuropic. Phallus cylindrical at base but flattened dorso-ventrally in apical half, phallus apex with distinctive form, hooked to the left when viewed ventrally; endophallus straight and wide, with two rows of 5-7 moderately large spines (esp) from mid-length towards apex.

Female genitalia. Fig. 71A. Width 0.76 - 0.84 mm. One spermatheca (sp1), dome shaped, dome relatively small; spermathecal ring sclerite (srs) dividing spermatheca from spermathecal duct; one spermathecal accessory gland (sg) with spermathecal gland duct (sgd) attachment on lobe (srsl) coming off of right side of ring sclerite when viewed from ventral aspect.

Habitat, habits, and seasonal occurrence.

The known elevational range of D. badiadorsis is from 310 to 1400 meters with most being collected between 475 and 800 meters in elevation. Adults of this species are found in mixed forest of montane areas. Many specimens have been collected both from deadwood and trunks of live trees. Specimens have been collected from April to December in Taiwan with the majority being collected in May. Methods of collecting include u.v. light, m.v. light, sweep netting, hand collecting, and malaise trap.

Geographical distribution.

Dolichoctis badiadorsis is known only from Taiwan. See Figure 72.