Amphimenes beichatiensis, 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 : 16-17

Amphimenes beichatiensis sp. n. Figs 6, 7 A–C, 8A, 12

Specific epithet.

The name of this species refers to the locality, Beichatien Mountain (北插天山), where the single specimen was collected.

Types and other material examined.

Holotype (male) labeled “Holotype” [circular, ringed with red]; "TAIWAN: Taoyuan Co./Fuxing township,/Beichatien Mountain/24.7906N, 121.4410E"; "hand collecting, night/~1320m,/Acc. Ti-96b /June 17, 2011/Coll. W. M. Hunting"; " NCHU/100698".

Type locality.

Beichatien Mountain (北插天山).

Diagnosis.

This species is distinguished from other Taiwanese Amphimenes by a combination of elytra with a black suture in apical half and a disc with randomly scattered punctures on entire dorsal surface of, +/- irregularly shaped in basal half.

Description.

OBL 6.3 mm. Length: head 0.64, pronotum 1.20, elytra 3.50, metepisternum 0.84 mm; width: head 1.12, pronotum 1.56, elytra 2.5, metepisternum 0.52 mm.

Body proportions. HW/HL 1.75; PWM/PL 1.30; EL/EW 1.40; ML/MW 1.62.

Color. Fig. 6. Dorsum of head brunneo-piceous; clypeus and labrum rufo-brunneous; pronotum nearly piceous with margins rufo-brunneous; proepipleuron rufo-brunneous; antennae rufo-brunneous; palpi rufo-brunneous; elytral disc nearly piceous, lateral margins and sutural margin rufo-brunneous, translucent; elytral epipleura rufo-brunneous; thoracic sclerites brunneo-piceous; abdominal sterna brunneo-piceous medially and nearly piceous at lateral margins; legs with trochanter and femora rufo-testaceous, tibia rufo-brunneous to brunneo-piceous.

Microsculpture. Dorsum of head and pronotum with isodiametric mesh pattern easily visible at 50 × magnification; elytra with transverse sculpticells forming elongate mesh, faintly visible at 50 × magnification.

Macrosculpture and pilosity. Elytra randomly scattered punctures on intervals, more or less evenly spaced throughout length, -/+ irregularly shaped in basal half; striae faintly punctate along length.

Pilosity. Elytra with scattered punctures visible, each bearing a small seta not visible at 50 × magnification.

Luster. Elytra moderately glossy; ventral thoracic sterna and abdominal sterna moderately glossy.

Head. Fig. 8A. Labrum with indentation along apical margin, somewhat bilobed; eyes moderately convex.

Pronotum. Lateral margins narrow; posterio-lateral margins obtuse, almost right-angled; basal lobe present.

Elytra. Humeri broadly rounded; striae moderately impressed; lateral margins somewhat rounded; elytral apices truncate.

Hind wings. Macropterous.

Legs. Meso-tibia with several shallow notches from mid-way to base along ventral surface.

Male genitalia. Fig. 7 A–C. Length 1.60 mm. Phallus with several carina from base (bpc), longer to shorter from center to right of center when viewed ventrally; ventral carina from median of shaft almost to ostium margin; endophallus with small internal endophallic sclerite near apex.

Female genitalia. Female unknown.

Habitat, habits, and seasonal occurrence.

The single specimen was collected from a live tree trunk in a montane mixed secondary forest. It was hand collected one night in June, at an elevation of 1320 meters.

Geographical distribution.

Known only from type locality. See Figure 12. This locality was not sampled well or often so it is possible that many more specimens will be collected in the near future.