Campsicnemus lobatus Evenhuis

Evenhuis, Neal L., 2008, The Campsicnemus lobatus and zigzag groups in the Society Islands, French Polynesia (Diptera: Dolichopodidae), Zootaxa 1910, pp. 27-44 : 33-34

Campsicnemus lobatus Evenhuis , n. sp.

( Figs. 2 , 5 , 11 )

Diagnosis. Among species of the lobatus group, it is similar to C. rheocrenus but can be separated from it by the presence of a falcate wing tip (this shape not present in C. rheocrenus ) and by the thick band of infuscation along the distal wing margin (this band of infuscation, if present, very thin in C. rheocrenus ).

Description. Body length: 6.5–7.0 mm. Wing length: 5.5–6.2 mm. Head. Male. Black, face black; oc and vt black, about one-half length of antennal arista; front, occiput, and vertex black with blue highlights; face constricted at middle, eyes holoptic; palp very small, dark brown; proboscis very small, brown, not extending below eye in lateral view; antennal segments brown; postpedicel subtriangular, length about equal to 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: 4 dc; 2 np; 2 ph; 1 pa; 1 + 1 sc; ac uniseriate; halter stem and knob white.

Legs: CI yellowish white, CII and CIII brown; FI and FII yellowish white, FIII yellowish basally, dark brown on apical one-half; TiI and TiII all yellow; 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. 5 ): Pale smoky throughout; costal region straight, not bulging; cell r2+3 not infuscated; R2+3 and R4+5 parallel at wing margin, about as wide as distance between R4+5 and M1+2 at wing margin; vein M1+2 straight to swing margin; apex of wing falcate just below end of vein M1+2; thick spot of color at apex of wing extending posteriorly as thick band of infuscation along distal and posterior wing margin from end of M1+2 (MSSC); vein CuA1 with thick infuscation from crossvein dm-cu to wing margin (MSSC); crossvein dmcu perpendicular to radial veins; anal region with distinct lobe.

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

Female. As in male except for lack of MSSC; eyes dichoptic, face bulging slightly in lateral view; legs normal, without modifications.

Types. Holotype ɗ (BPBM 16,647) [BPBM1013220] and 19ɗ [BPBM1013221], 30Ψ [BPBM1013222] paratypes 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. Other paratypes: FRENCH POLYNESIA: Society Is: Moorea: 2ɗ [EMEC1013026], 6Ψ [EMEC1013027], 3 coconuts trail, 350 m, 17°32'58"S, 149°50'06"W, sweeping wet seeps adjacent to cascade at stream, 10 Jul 2006, P. O’Grady; 2ɗ [BPBM1013223], 3Ψ [BPBM1013224], Vaioro Rivière waterfall above Afareaitu, sweeping seeps at small cascade and 30-foot waterfall near head of valley and main 150-foot waterfall, 11 Jul 2006, N. Evenhuis, P. O’Grady (see Fig. 11 ). Holotype in BPBM. Paratypes in BPBM, and EMEC.

Etymology. The specific epithet derives from the Latin lobus = “elongated projection”; referring to the characteristic small lobe-like or falcate apex of 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.

FIGURES 10 – 13. Localities for species of the lobatus group. 10. Lower Fa’anui stream, Bora Bora. Photo by Ron Englund. 11. Afareiatu Cascade, Moorea. Photo by Patrick O’Grady. 12. Small unnamed cascade below Cascade Vaimahuta, Tahiti (unofficially named Craig’s Cascade). Photo by Doug Craig. 13. Seep at Col Urufau, Tahiti. Photo by Patrick O’Grady.