Forcipomyia (Metaforcipomyia) atenasensis n. sp.

(Figs. 34–39, 140)

Diagnosis. Male: only species of Neotropical Forcipomyia (Metaforcipomyia) with a hind tarsal ratio of 0.93, labrum tapering apically, legs darkly pigmented except with the base of the hind tibia paler and parameres absent. Female: unknown.

Description. Male. Head. Pale brown. Eyes abutting medially for length of three ommatidia. Antenna (Fig. 34) pale brown with plume setae poorly developed, flagellomeres 2–4 spherical, flagellomere 10 1.5 X longer than flagellomere 11, flagellomeres 10–13 elongate; flagellomere 13 with long apical nipple, not constricted basally; AR 1.15. Palpus (Fig. 35) pale brown; segment 3 swollen proximally, with scattered sensillae on surface; PR 3.06. Labrum tapering apically.

Thorax. Pale except scutellum and postscutellum brown; scutellum 8–9 strong setae and few minor ones. Legs (Fig. 36) brown; femora brown with at least ¼ apical pale, tibiae with broad basal portion paler than apex (more evident on hind leg); apex of hind tibia with 5 spines; tarsomeres brown with pectinate scales; tarsomere 1 of foreleg with row of 7, 8 spine-like bristles, tarsomere 1 of hind leg with two rows of thick setae on basal portion; foreleg TR 1.75, midleg TR 0.71, hind leg TR 0.93; claws curved, moderately stout. Wing (Fig. 37) plain, without pattern of pigmented membrane; first radial cell obliterated; second radial cell well developed, fork of cubitus situated at level of apex of costa; wing length 1.76 mm; breadth 0.60 mm; CR 0.39. Halter whitish.

Abdomen. Tergites pale brown with brownish lateral spots. Genitalia (Fig. 38): Brown. Tergite 9 short, only extending to 1/4 length of gonocoxite; posterior margin concave; cercus lobe-like, produced beyond 1/2 length of gonocoxite; sternite 9 broad, posterior margin nearly straight. Gonocoxite stout, 1.8 X longer than greatest breadth; gonostylus slightly paler, 0.85 length of gonocoxite, almost straight, tip blunt. Parameres absent, gonocoxal apodemes slightly curved. Aedeagus (Fig. 39) stout, abruptly narrowed to elongate, slender directed prong, tip pointed; basal arch poorly sclerotized, extending to 1/10 of total length; lateral arms extending laterally.

Female. Unknown.

Distribution. This species is known only from the type locality in Costa Rica (Fig. 140). The holotype was swept from near a watering trough, fed by a spring in Atenas, Costa Rica (approximately 200 m NW of Don Yayo, a local grocery store), at an altitude of about 650 meters.

Taxonomic discussion. This species is similar to F. anniae in general body pigmentation and aedeagus shape. However, the latter species is easily distinguished by the coloration of the hind leg, with a broad basal dark band on the hind femur and subbasal and apical dark bands on the hind tibia.

Type material. Holotype male on microscope slide, labeled “ HOLOTYPE Forcipomyia (Metaforcipomyia) atenasensis Spinelli, Marino and Borkent, Costa Rica, Atenas, 29-XI-1993, A. Borkent, CD 1688” (CNCI). Derivation of specific epithet. The name atenasensis refers to the type-locality.