Campsicnemus ostlinx Evenhuis

Evenhuis, Neal L., 2008, The Campsicnemus lobatus and zigzag groups in the Society Islands, French Polynesia (Diptera: Dolichopodidae), Zootaxa 1910, pp. 27-44 : 41

Campsicnemus ostlinx Evenhuis , new species

( Figs. 16 , 21 )

Diagnosis. Easily separated from the other species in the zigzag group by the curlicue setae ( Fig. 16 ) on the venter of the mid femur in the male and the mid tibia bearing a patch of small, peg-like setae near the midpoint on the mesal surface (these peg-like setae absent in other species of the zigzag group).

Description. Body length: 2.2–2.3 mm. Wing length: 2.0– 2.1 mm. Male. Head. Black, face black, silvery tomentose on clypeus; oc and vt black, about one-half length of antennal arista; front, occiput, and vertex black with blue highlights; face constricted at middle, almost holoptic, eyes separated below antennae by width of 1–2 ommatidia; palp small, brown; proboscis brown, extending well below eye in lateral view; antennal scape and pedicel black to brown; postpedicel black, long, lanceolate, length about 3.5 x width; arista slightly longer than head height.

Thorax: Mesoscutum, 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 sc; ac uniseriate; halter stem and knob white.

Legs: Coxae brown; femora yellow, FIII brown apically; rest of legs yellowish brown; FII ( Fig. 16 ) with 6 stiff black setae ventrally, with one thick straight seta and one curlicue seta on apical third of ventral surface (MSSC); TiII ( Fig. 21 ) relatively straight, with small patch of 8–9 peg-like setae basomedially and 3 strong black setae on apical one-third (MSSC), smaller black setae and hairs along entire ventral and posterior surfaces. 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. Same as in male except lack of MSSC; postpedicel subtriangular, length subequal to height.

Types. Holotype ɗ (BPBM 16,631) [BPBM 101245] and 1 Ψ paratype [BPBM 101246] from FRENCH POLYNESIA: Society Is: RAIATEA: Temehani, Uteute, 1942 ft, 16.7792°S, 151.46326°W, 3 Feb 2006, R.A. Englund. Holotype and paratype in BPBM.

Etymology. The specific epithet derives from the Greek οστλινξ = “curled hair, tendril”; referring to the characteristic curlicue seta on the venter of the mid femur of the male.

Figures

FIGURES 14 – 18. Campsicnemus zigzag group male mid femur. 14. C. mylloseta; 15. C. ogradyi; 16. C. ostlinx; 17. C. tahaanus; 18. C. zigzag.

FIGURES 19 – 23. Campsicnemus zigzag group male mid tibia. 19. C. mylloseta; 20. C. ogradyi; 21. C. ostlinx; 22. C. tahaanus; 23. C. zigzag.