Campsicnemus pectinatus Evenhuis

Evenhuis, Neal L., 2013, The Campsicnemus popeye species group (Diptera: Dolichopodidae) from French Polynesia, Zootaxa 3694 (3), pp. 271-279 : 277-278

Campsicnemus pectinatus Evenhuis , sp. nov.

( Fig. 4 )

Diagnosis. Fits closest to C. meyeri , sp. nov. but is distinguished from it by the conspicuous mid tibial pecten (absent in C. meyeri ) and the mid tibia with two long stiff setae apically (these long apical setae absent in C. meyeri ).

Description. Male. Body length: 2.2 mm. Wing length: 2.4 mm. Head: Black, face dark brown to black, clypeus yellow; oc and vt yellowish white, about one-third length of antennal arista; front, occiput, and vertex black with blue highlights; face constricted at middle, eyes almost holoptic, contiguous below antennae for length of 3–4 ommatidia; palpus small, brown; proboscis yellowish brown, extending below eye in lateral view; antennal segments yellow; postpedicel long, thin, lanceolate, length about 4.0 x width; arista slightly longer than head height. Thorax: Mesoscutum, scutellum, and pleura yellow; thoracic setae yellowish brown: 3 dc; 2 np; 2 ph; 1 pa; 1 sc; ac absent; halter stem and knob yellowish. Legs: Yellowish white; foreleg unmodified, without MSSC; FII with 3 long yellow setae ventrally at middle; TiII ( Fig. 4 ) contorted, swollen medially, with “comb” of long thick leaflike setae ( Fig. 4 b) in middle on lateral surface, row of stiff hairs mesally, with ring of 6 long strong spiky setae on apical third, 2 pointed mesally longest, longer than IIt2 (MSSC). IIt1 long, about 2 x length of IIt2, without MSSC. Remainder of leg segments without MSSC. Wing: Yellowish subhyaline. Abdomen: Segments I–V reddish brown, VI–VII yellowish, all with short black hairs dorsally on each tergite, a few longer hairs laterally; sternites reddish brown. Hypopygium yellow, not dissected. Female. Unknown.

Types. HOLOTYPE ♂ (BPBM 16,655) from FRENCH POLYNESIA: Marquesas: NUKU HIVA: Toovii, Oomu, 900 m, 16–19.vii.1977, W.C. Gagné & S.L. Montgomery. Holotype in BPBM. The left midleg of the holotype was been removed for SEM photography and is mounted on an SEM stub.

Etymology. The specific epithet derives from the Latin pecten = “comb”; referring to the comb-like arrangement of setae on the mid tibia of males of this species.

Figures

FIGURES 3 – 4. Campsicnemus male mid legs, left leg, lateral view. 3. C. meyeri Evenhuis, sp. nov., femur and tibia 4. C. pectinatus Evenhuis, sp. nov. a. light microscope image of tibia, showing two long apical setae. b. scanning electron image of tibia showing “ pecten ” of thick setae. Scale bars for 3 a, b, 4 a = 0.1 mm; bar for 4 b = 0.05 mm.