Campsicnemus mylloseta Evenhuis

Evenhuis, Neal L., 2008, The Campsicnemus lobatus and zigzag groups in the Society Islands, French Polynesia (Diptera: Dolichopodidae), Zootaxa 1910, pp. 27-44 : 38

Campsicnemus mylloseta Evenhuis , new species

( Figs. 14 , 19 )

Diagnosis. This species is easily distinguished from the other members of this species group by the single kinked seta with a tiny horn-like spur ( Fig. 14 ) on the apical third of the male mid femur venter (this modified setae hooked, curlicue, bifid, or bent in the other species).

Description. Body length: 1.0– 1.1 mm. Wing length: 1.3–1.4 mm. Male. Head. Black, face black; oc and vt broken off; 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, dark brown; proboscis brown, extending slightly below eye in lateral view; antennal segments yellowish brown; postpedicel long, conical, length about 3.5 x width; arista slightly longer than head height.

Thorax: Mesoscutum, scutellum, and pleura yellowish with brown admedian vittae coalesced in prescutellar area; thoracic setae black: 1 + 3 dc; 2 np; 2 ph; 1 pa; 1 + 1 sc; ac absent; halter stem yellowish brown, knob brown.

Legs: CI and CIII; CII brown; remainder of legs yellowish; FII ( Fig. 14 ) with 4–5 stiff black setae ventrally, with one thick straight seta and one crooked or kinked seta with small horn-like spur; TiII ( Fig. 19 ) relatively straight, swollen medially, with 8 long stiff setae on lateral surface basal to and on swollen area (MSSC), smaller black setae and hairs along entire ventral and posterior surfaces. Remainder of leg segments broken off and missing.

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. Yellow with brown along posterior margins, with sparse short black hairs dorsally on each tergite; tergal interstices whitish; sternites yellowish. Hypopygium yellowish brown with paler brown cerci, not dissected.

Female. same as in male except lack of MSSC; postpedicel length subequal to width, pointed apically.

Types. Holotype ɗ (BPBM 16,749) and paratype Ψ from FRENCH POLYNESIA: Society Is: HUAHINE: Mt. Turi, 630–650 m, 25 Jul 2007, Metrosideros sweep, R. Englund. Holotype deposited in BPBM.

Remarks. The holotype is damaged with only the mid femora (and one mid tibia) remaining beyond the coxae. The rest of the legs are missing but enough salient characters exist to easily verify this as a new species. Given these facts plus the small chance that other specimens will be collected anytime soon as the type locality is extremely difficult to access, it was thought best to go ahead with the description here based on only one male specimen.

Etymology. The specific epithet derives from the Greek, Μψλλοσ = “bent, crooked”; referring to the kinked black seta on the venter of the mid femur that characterizes the species.

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.