Campsicnemus borabora Evenhuis

Evenhuis, Neal L., 2008, The Campsicnemus lobatus and zigzag groups in the Society Islands, French Polynesia (Diptera: Dolichopodidae), Zootaxa 1910, pp. 27-44 : 29-33

Campsicnemus borabora Evenhuis , n. sp.

( Figs. 1 , 7 , 10 )

Diagnosis. Among the lobatus group of Campsicnemus , this species is similar to C. tunoa and C. paralobatus in having yellow coloration on the lateral portions of tergites II and III. It can be separated from them by the lack of a distinct spot of color apically on the wing at the end of vein M1+2 (this spot present in C. paralobatus and C. tunoa ).

Description. Body length: 6.5–6.7 mm. Wing length: 4.2–6.0 mm. Male. Head. Black, face black with reddish bronze highlights; oc and vt black, about one-half 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 3 ommatidia; palp very small, dark brown; proboscis very small, brown, extending slightly below eye in lateral view; antennal segments brown; postpedicel subtriangular, length subequal to width; arista about equal to 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 yellow, TiII and 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. 7 ): Pale smoky throughout; costal region bulging near midpoint; cell r2+3 infuscated basally (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; thick 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); 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 posterolaterally (MSSC) ( Fig. 1 ); tergal interstices whitish; sternites II and III yellowish, sternites IV-VII brown. Hypopygium brown with brown cerci, not dissected.

Female. As in male except for lack of MSSC; face slightly bulging in lateral view; eyes more dichoptic, not converging below antennal bases.

Types. Holotype ɗ (BPBM 16,824) and 1ɗ paratype from FRENCH POLYNESIA: Society Is: Bora Bora: Fa’anui Stream, 100–118 m, 1 Jul 2007, R.A. Englund, S. Jordan (see Fig. 10 ). Other paratypes: FRENCH POLYNESIA: Society Is: Bora Bora: 6Ψ, Fa’anui Stream, 81 m, 2 Jul 2007, R.A. Englund, S. Jordan. Holotype and paratypes in BPBM.

Etymology. The specific epithet derives from the type locality of the island of Bora Bora and is treated as a noun in apposition.

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.