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: 43-45

publication ID 10.5281/zenodo.185641

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Campsicnemus  aa Evenhuis, new species

( Figs. 21View FIGURE 21 – 22, 23View FIGURES 23 – 27)

Diagnosis. This species is similar to C. ee in the aa group by the presence of a prominent hooked apex on the fore tibia but can be separated from it by the fore tibia with a bulge medially bearing dense short stiff spines (this bulge with long spiky setae in C. ee).

Description. Male. Body length: 3.4 mm. Wing length: 3.4 mm.

Head. Black, face dark brown to black with reddish 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; scape and pedicel dark brown; postpedicel yellow, short, conical, length subequal to width; arista slightly longer than head height.

Thorax: Mesoscutum, scutellum, and pleura dark brown to 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; TiI ( Fig. 21View FIGURE 21 – 22) swollen just beyond middle on ventral surface, with large hook-like process apically, length of hook-like process more than 2 x width of tibia, swollen area with dense, short stiff setae, apical hook-like process with dense tibial comb (pecten) ( MSSC), 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. Dark brown with short black hairs dorsally on each tergite, a few longer hairs laterally; tergal interstices whitish; sternites yellowish brown. Hypopygium dark brown with paler brown cerci, not dissected.

Female. Unknown.

Types. Holotype ɗ ( BPBM Type 16,757) [ BPBM 1013200] from FRENCH POLYNESIA: Marquesas: NUKU HIVA: Tekau Ridge, 3800–4000 ft [1158–1220 m], 8 ° 31 ' 59 "S, 140 ° 10 ' 24 "W, 21 Oct 1999, J.T. & D.A. Polhemus. Holotype in BPBM.

Etymology. The specific epithet derives from the Marquesan ‘a‘a = defender. The name is treated as a noun in apposition.