Campsicnemus

Evenhuis, Neal L., 2009, Review of Campsicnemus (Diptera: Dolichopodidae) of the Marquesas, French Polynesia, with description of four new species groups, Zootaxa 2004, pp. 25-48 : 47-48

Campsicnemus uu Evenhuis, new species

( Figs. 9 , 27 )

Diagnosis. Distinguished from other members of the aa group by sharp, pointed and bare apical process of the fore tibia (hook-like or pad like, and/or with hairs in the other species in the aa group) and the two conspicuous strong black setae on the mesoventral surface of the mid femur (these setae absent in the congeners in this species group).

Description. Male. Body length: 1.7–1.8 mm. Wing length: 1.8–1.9 mm.

Head. Black, face dark brown to black with greenish highlights, dark brown near clypeus; oc and vt black, about one-third 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, dark brown; proboscis brown, extending slightly below eye in lateral view; antennal segments brown; postpedicel long, lanceolate-conical, length 3 x width; arista slightly longer than head height.

Thorax: Mesoscutum, scutellum, and pleura brown throughout, with a few metallic bluish highlights dorsolaterally; thoracic setae black: 1 + 3 dc; 2 np; 2 ph; 1 pa; 1 + 1 sc; ac absent; halter stem and knob white.

Legs: CI yellowish, CII and CIII brown; FI and FII yellowish brown, FIII yellowish brown basally, becoming darker brown on apical one-fourth; remainder of legs yellowish brown; femora unmodified, without MSSC; FII yellow, with 2 strong black setae mesally on ventral surface (MSSC); TiI with hook-like process apically( Fig. 27 ), length of hook-like process less than width of tibia, row of short stiff setae subapically, apical hook-like process bare; remainder of foreleg unmodified; TiII slightly thicker medially, with regular rows of short strong setae on dorsal surface (MSSC). TiIII unmodified. Remainder of leg segments without MSSC.

Wing: pale smoky throughout; posterior crossvein perpendicular to vein M.

Abdomen. Brown, darker brown on posterior margins, with short black hairs dorsally on each tergite, tergal interstices whitish; sternites yellowish brown, darker apically. Hypopygium dark brown with paler brown cerci, not dissected.

Female. As in male except for lack of MSSC; postpedicel length about 1.5 x width; legs normal, without modifications.

Types. Holotype ɗ (BPBM Type 16,666) [BPBM 101308] and 1Ψ paratype [BPBM 101309] from FRENCH POLYNESIA: Marquesas: UA HUKA: Hitikau Ridge, 2900 ft [884 m], 2 Nov 1999, D.A. Polhemus (see Fig. 9 ). Other paratypes. FRENCH POLYNESIA: Marquesas: U A H UKA: 2ɗ [BPBM 101310], Hitikau Ridge, 2500 ft [762 m], 3 Mar 1931, sweeping over grasses, LaBronnec & H. Tauraa, Pacific Entomological Survey; 1 ɗ (damaged) [BPBM 101311], Vaipaea Cascade, 680 ft [207 m], 3 Nov 1999, R.A. Englund. Holotype and paratypes in BPBM.

Remarks. The characteristic two strong mid femoral setae are missing in the holotype (sockets are visible) but are present in two of the three male paratypes.

Etymology. The specific epithet derives from the Marquesan ‘u‘u = “tremble, shake, stutter”. The name is treated as a noun in apposition.

Figures

FIGURES 7 – 9. Marquesan habitats. 7. Hiva Oa, Upper Atuona Valley, Atikoua Stream: type locality for Campsicnemus plautus, n. sp. and habitat for C. uncleremus Evenhuis. Collector Dan Polhemus in foreground. 8. Nuku Hiva, Hakaui River: probable type locality for C. scurra Parent. 9. Ua Huka, Hitikau Ridge. Inset: collector Dan Polhemus fogging on ridge summit: habitat for C. uu, n. sp.

FIGURES 23 – 27. Campsicnemus apices of fore tibiae showing hook-like process and setal arrangement. 23. C. aa, n. sp. 24. C. ee, n. sp. 25. C. ii, n. sp. 26. C. oo, n. sp. 27. C. uu, n. sp.