Campsicnemus tahaanus Evenhuis, new species

(Figs. 17, 22)

Diagnosis. This species is easily distinguished from the other members of the zigzag group by the single bifid seta (Fig. 17) on the ventroapical third of the male mid femur (this modified seta hooked, curlicue, kinked, or zigzagged in the other species of this group).

Description. Male. Body length: 1.5 mm. Wing length: 1.4 mm. Head (damaged: the eyes, face, front and antennae are missing). Occiput and vertex black with blue highlights; palp small, dark brown; proboscis brown, extending below level of eye in lateral view.

Thorax: Mesoscutum (cracked medially and slightly damaged with some setae missing but setal sockets visible to allow for setal counts), scutellum, and pleura dark brown to black throughout, with a few metallic greenish highlights laterally; thoracic setae black: 1 + 3 dc; 2 np; 2 ph; 1 pa; 1 + 1 sc; ac absent; halter stem and knob brown.

Legs: CI and FI white; CII and CIII brown; FII yellowish brown, FIII yellowish brown basally, becoming darker brown on apical one-eighth; remainder of legs yellowish brown; FI and remainder of foreleg unmodified, without MSSC; FII (Fig. 17) with 5 stiff setae ventrally, single thick straight seta and single bifid seta on apical third of ventral surface; TiII (Fig. 22) relatively straight, with long setae restricted to apical one-fourth (MSSC), smaller black setae and hairs along entire ventral surface. Remainder of leg segments without MSSC.

Wing: Pale smoky throughout; subcostal section straight, not concave; alula extremely reduced; no indentation on M1+2 beyond crossvein dm-cu; crossvein dm-cu perpendicular to CuA1.

Abdomen. Brown with short black hairs dorsally on each tergite, a few longer hairs laterally; tergal interstices whitish; sternites brown. Hypopygium brown with paler brown cerci, not dissected.

Female. Unknown.

Types. Holotype ɗ (BPBM 16,654) [BPBM 101302] from FRENCH POLYNESIA: Society Is: TAHAA: Vaihururu Stream, 350 ft, 16.61365°S, 151.48914°W, riffles/pools, 21 Jun 2007, R. Englund, L. Englund.

Etymology. The species epithet derives from the type locality of the island of Tahaa.