Corynoptera fratercula Vilkamaa & Hippa, 2006, sp. n.

Corynoptera fratercula sp. n.

Material examined. Holotype male: USA, Alaska, mi S Anderson Jct, Rte 3, mi 270, alderpoplar­spruce, Malaise trap, 23.vi.–11.viii.1984, S. & J. Peck (MZH). Paratypes: same data as holotype, 1 ɗ (MZH), CANADA, British Columbia, Vancouver Island, Upper Carmanah Valley, forest floor, Malaise trap. 30.vii.1991, N. Winchester, 2 ɗ (CNC, RBCM), same data but Malaise trap, 31.vii.–11.viii.1991, 2 ɗ (MZH).

Description (male). Head (Fig. 4): Eye bridge 2 or 3 facets wide. Prefrons with 17–24 setae, clypeus with 1–3 setae. Length/width of antennal flagellomere 4 1.90–2.25 (Fig. 5 C). Palpomere 1 of maxillary palp with 1 or 2 setae (Fig. 4 D and E). Thorax: Anterior pronotum with 3–5 setae, episternum 1 with 5–9 setae. Wing: Length 1.4–1.6 mm, width/ length 0.40–0.45, c/ w 0.50 –0.60, R1/R 0.60–0.80. Legs (Fig. 6 D): Length of front basitarsomere/length of front tibia 0.50–0.60. Abdomen: Sternite 8 with 2–8 setae. Hypopygium (Fig. 3 C–D): Sternite 10 with 1 seta on each half.

Female. Unknown.

Discussion. Corynoptera fratercula resembles C. vagula and differs from other species in having a pair of mesial megasetae distinctly separated from the subapical group of megasetae on the gonostylus. Corynoptera fratercula differs from C. vagula in having the tegmen shorter than long, apically more roundish but with more strongly curved parameres and with longer parameral apodemes (Figs. 1 A, C; 3C, E). Furthermore, in C. fratercula the megasetae of the gonostylus are slightly weaker and the pair of mesial megasetae is more basal in position on the gonostylus (Figs. 1 B, D; 3D). Corynoptera fratercula differs from all other species discussed here by having the intercoxal area of the hypopygium longer and by having the bases of the gonocoxites ventrally more densely setose (Fig. 3 E).