Campsicnemus cheesmanae 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 : 36-37

Campsicnemus cheesmanae Evenhuis , n. sp.

( Figs. 10 , 14 )

Diagnosis. Can be separated from members of the englundi group by the three dense patches of short setae on the mid tibia (scattered long setae or uniformly short and long setae in plautus and englundi ), and the unmodified mid basitarsus (wider apically than other tarsomeres and/or flared in the other species in the englundi group).

Description. Male. Body length: 2.9–3.4 mm. Wing length: 2.5–2.6 mm.

Head. Black, face dark brown to black with reddish highlights, paler 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 below eye in lateral view; antennal segments black to brown; postpedicel short, conical, length about 1.5 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 + 4 dc; 2 np; 2 ph; 1 pa; 1 + 1 sc; ac absent; halter stem white, knob dark brownish black.

Legs: CI diffuse brown basally, yellowish on apical one-third; remainder of legs (except yellow venter of FI) brown; foreleg unmodified, without MSSC; FII ( Fig. 14 ) with strong, swollen area ventrally bearing rows of strong, stiff black setae mesally and ventrally, small patch of 3–4 strong, long black setae at extreme base, and with small subapical protuberance bearing single seta; FIII as in C. gladiator , with 6–7 long setae on ventroapical surface (MSSC); TiII ( Fig. 14 ) slightly sinuous and slightly swollen on basal fourth, with long setae on basal half on dorsal surface, sparse strong, stiff black setae on ventral surface, and dense patch of short, stiff, blunt setae on apical fourth of dorsal surface (MSSC), a few smaller black setae and hairs along medial portion of ventral surface; tiny spicules densest medially, becoming sparse in single row apically. TiIII with dense patch of strong stiff setae subbasoventrally, slightly curved apically, becoming shorter apically, dorsal surface with small hairs and only two long setae (one subbasally; the other near middle) (MSSC). IIt1 ( Fig. 14 ) short, about one-fourth length of IIt2; IIt2 inserted apically on IIt1. Remainder of leg segments without MSSC.

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

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

Female. Unknown.

Remarks. Females were collected at some of the localities, but since other species of Campsicnemus were collected with C. cheesmanae , it was impossible to associate females of any of the species at these localities and cannot be included in the material examined.

Types. Holotype ɗ (BPBM Type 16,636) [BPBM1013169] and 13ɗ [BPBM1013170] paratypes from FRENCH POLYNESIA: Marquesas: FATU HIVA: Omoa [River], 1000–1320 ft [328–402 m], 28 Aug 2001, cascades/pools, R.A. Englund (see Fig. 10 ). Other paratypes: FRENCH POLYNESIA: Marquesas: FATU HIVA: 10ɗ [BPBM1013171], north branch Omoa [River], 400–500 ft [122–152 m], 28 Aug 2001, riffles/ pools, R.A. Englund; 12ɗ, Upper Omoa River, 1.6 mi [1 km] above Omoa, 10°30'31"S, 138°39'46"W, 26 Aug 2008, skating on surface of stream pools, D.A. Polhemus. Holotype in BPBM. Paratypes in BPBM and USNM.

Etymology. The specific epithet honors the late L. Evelyn Cheesman for her incredible collecting efforts in French Polynesia and elsewhere in the Pacific.

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 14 – 16. Campsicnemus englundi group, male midlegs. 14. C. cheesmanae, n. sp., femur, tibia, and basitarsus. 15. Campsicnemus englundi, n. sp., femur, tibia, and basitarsus. 16. Campsicnemus plautus, n. sp., femur, tibia, and all tarsi, showing flared basitarsus and swollen second tarsomere.