Campsicnemus paralobatus Evenhuis

Evenhuis, Neal L., 2008, The Campsicnemus lobatus and zigzag groups in the Society Islands, French Polynesia (Diptera: Dolichopodidae), Zootaxa 1910, pp. 27-44 : 34-35

Campsicnemus paralobatus Evenhuis , new species

( Figs. 3 , 8 , 12 )

Diagnosis. Similar to C. borabora and C. tunoa by virtue of the yellow color on the lateral portions of tergites II and III. It can be separated from C. borabora by the prominent apical spot of color on the wing (this spot absent in C. borabora ) and distinguished from both species by the crossvein dm-cu perpendicular to the radial veins (this crossvein perpendicular to vein CuA 1 in C. borabora and C. tunoa ).

Description. Body length: 6.2 mm. Wing length: 5.7 mm. Male. Head. 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, extending slightly below eye in lateral view; antennal segments black to brown; postpedicel long, subtriangular, rounded apically, length about 3.5 x 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 and CIII white, otherwise as in C. lobatus .

Wing ( Fig. 8 ): 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 radial veins; 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 (MSSC) ( Fig. 3 ); tergal interstices whitish; sternites II and III yellowish, sternites IV–VII brown. Hypopygium brown with brown cerci, not dissected.

Female. Unknown.

Types. Holotype ɗ (BPBM 16,740) [BPBM 101247] from FRENCH POLYNESIA: Society Is: TAHITI NUI: Cascades de Tefauromai, Cascade Vaimahuta, 31 Mar 2007, in small cascade 100 m below main falls, N.L. Evenhuis (see Fig. 12 ). Holotype in BPBM.

Remarks. The left wing was removed for photography and is placed in a microvial in association with the type specimen. Diligent collecting at the main steep wall of cascades (over 100 m tall) and surrounding seeps on this collecting trip and a subsequent one did not find any Campsicnemus . However, sweeping the seep of a small cascade originating from a tributary further downstream (the cascade was only a few meters tall) resulted in the collection of this single specimen.

Etymology. The specific epithet derives from the Latin para, “ near” + lobatus ; referring to close appearance of this species to lobatus from Moorea.

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.