Campsicnemus dytei Evenhuis

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 : 40-41

Campsicnemus dytei Evenhuis , new species

( Figs. 12 , 17, 19 )

Diagnosis. Most similar in appearance to C. hihiroa , n. sp. but can be distinguished from it by the presence of one pair of strong long black setae on the mid basitarsus (two pairs present on the mid basitarsus in C. hihiroa ).

Description. Male. Body length: 2.1 mm. Wing length: 1.8 mm.

Head. Black, face dark brown to black with reddish highlights, paler brown near 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, dark brown; proboscis brown, extending below eye in lateral view; antennal segments black to brown; postpedicel short, conical, slightly less than width; arista slightly longer than head height.

Thorax: Mesoscutum, scutellum, and pleura brown throughout, with a few metallic bluish highlights dorsolaterally, darker brown dorsomedially; 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 brown, CII, pale brown; femora yellowish, FII yellowish brown apically; tibiae yellow basally; remainder of legs brown; TI ( Fig. 17 ) slightly swollen medially on ventral surface, bearing 3 strong stiff black setae (MSSC), remainder of foreleg unmodified; FII with 2–3 strong black setae medially on mesal surface; hind leg unmodified, without MSSC; TiII with 2 long setae on mesal surface (MSSC). IIt1 ( Fig. 19 ) subequal in length to length of IIt2, with 2 very long strong black setae basally on mesal surface (length subequal to length of second tarsomere) (MSSC), row of shorter strong brown setae on lateral surface. Remainder of leg segments without MSSC.

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

Abdomen. Tergites I, V–VI dark brown, tergites II–IV brown, all with short black hairs dorsally on each tergite; tergal interstices whitish; sternites yellowish brown. Hypopygium light brown with light brown cerci, not dissected.

Female. Unknown.

Types. Holotype ɗ (BPBM Type 16,635) [BPBM1013179] from FRENCH POLYNESIA: Marquesas: HIVA OA: Vaioa River, 1040 ft [317 m], 30 Aug 2001, riffle/pools, R.A. Englund. Holotype in BPBM.

Remarks. The apical hind tarsomeres of the holotype are broken off and missing.

Etymology. Named in honor of dolichopodid colleague, C.E. “Peter” Dyte, in thanks for the generous and valuable help and advice he has given me during my studies on Dolichopodidae over the years.

Figures

FIGURES 10 – 13. Marquesan habitats. 10. Fatu Hiva, Omoa River: type locality for Campsicnemus cheesmanae, n. sp. and C. englundi, n. sp. 11. Ua Pou, Pouaoa River: habitat for C. gladiator, n. sp. 12. Hiva Oa, Vaiao River: habitat for C. uncleremus Evenhuis and C. dytei, n. sp. 13. Hiva Oa, Mt. Temetiu: habitat for C. hihiroa, n. sp. and C. taratara, n. sp.

FIGURES 17 – 20. Campsicnemus hihiroa group legs. 17. C. dytei, fore tibia. 18 – 20. Mid basitarsi. 18. C. hihiroa, n. sp., 19. C. dytei, n. sp. 20. C. taratara, n. sp.