Campsicnemus tunoa Evenhuis

Evenhuis, Neal L., 2008, The Campsicnemus lobatus and zigzag groups in the Society Islands, French Polynesia (Diptera: Dolichopodidae), Zootaxa 1910, pp. 27-44 : 36-37

Campsicnemus tunoa Evenhuis , n. sp.

( Figs. 4 , 9 )

Diagnosis. Among species of the lobatus group with an apical spot and reduced anal lobe, it is most similar to C. paralobatus but can be separated from it by the crossvein dm-cu perpendicular to vein CuA1 (this crossvein perpendicular to the radial veins in C. paralobatus ).

Description. Body length: 6.5 mm. Wing length: 6.0 mm. Male. Head. Black, face dark brown to black with reddish highlights, paler brown near clypeus; oc and vt black, about two-thirds 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 very small, dark brown; proboscis very small, brown, not extending below eye in lateral view; antennal segments black to brown; postpedicel long, subtriangular, length about equal to width; arista subequal to head height.

Thorax: Mesoscutum, scutellum, and pleura (except yellow metepisternum) dark brown to black throughout, with a few metallic greenish highlights laterally; thoracic setae black: 4 dc; 2 np; 2 ph; 1 pa; 1 + 1 sc; ac uniseriate; halter stem and knob white.

Legs: CI and CIII yellowish white, CII; FI and FII yellowish white, FIII yellowish basally, dark brown on apical one-half; TiI all yellow; TiII yellowish brown basally, brown on apical two-thirds; TiIII yellow only at extreme base, otherwise legs brown; femora without MSSC; TiII with 6–8 strong black setae basally, medially and apically on lateral and anterior surfaces, smaller stiff black setae and hairs along entire mesal surface (MSSC?); remainder of leg segments without MSSC.

Wing ( Fig. 9 ): Pale smoky throughout; costal region bulging near midpoint; cell r2+3 infuscated along most of its length (MSSC); R2+3 and R4+5 parallel almost to wing margin where they diverge very slightly; vein M1+2 curved downward beyond crossvein dm-cu, curved slightly upward at wing margin; apex of wing slightly falcate; end of vein M1+2 with thick spot of color, extending to relatively thin band of infuscation along distal wing margin from just below end of M1+2 to end of CuA1 (MSSC); small spot of black color at end of M1+2 (MSSC); crossvein dm-cu perpendicular to vein CuA1; anal lobe reduced, without distinct lobe, edge slightly concave just posterior to end of vein M1+2.

Abdomen. Dark brown with short black hairs dorsally on each tergite, a few longer hairs laterally; tergites II and III with large yellow patches of color laterally and extending onto dorsum (MSSC) ( Fig. 4 ); tergal interstices whitish; sternites II–IV yellowish, sternites I, V-VII brown. Hypopygium brown with brown cerci, not dissected.

Female. Unknown.

Types. Holotype ɗ (BPBM 16,987) [BPBM1013220] from FRENCH POLYNESIA: Society Is: Moorea: Tohiea Trail, tributary to Putoa Riv., above captage, ~ 150 m, 18 Mar 2007, sweeping wet rocks on side of stream, R.A. Englund. Holotype in BPBM.

Remarks. Left wing removed for photography and placed in a microvial in association with the type.

Etymology. The specific epithet derives from the Tahitian tunoa = “beauty spot”; referring to the apical spot on the wing.

Figures

FIGURES 1 – 4. Campsicnemus lobatus group, male habitus. 1. C. borabora; 2. C. lobatus; 3. C. paralobatus; 4. C. tunoa.

FIGURES 5 – 9. Campsicnemus lobatus group wings. 5. C. lobatus; 6. C. rheocrenus; 7. C. borabora; 8. C. paralobatus; 9. C. tunoa.