Enlinia frontalis Robinson 1969

Enlinia frontalis

MALE.—Length 1.0 mm; wing 1.2–1.3 mm by 0.5 mm. Front (Figure 178) slightly less than twice as wide as high, dark blue or violet with slight grayish pollen; face very high, narrowed below with eyes contiguous or nearly so in lower two-thirds; anterior eye facets only slightly enlarged. Palpus and proboscis dark. Antenna (Figure 180) black, segment 3 slightly pointed, about as long as broad, arista slightly longer than face.

Mesoscutum metallic dark green with slight blackish pollen, pleura more brown; setae dark with pale reflections; 5 pairs of small acrostichals; 6 or 7 pairs of dorsocentrals, hind pair rather long; scutellum hind margin rather evenly rounded, bristles as near sides as middle.

Legs black with dark setae. Forecoxa with small dark hairs anteriorly; fore- and middle femora with a small very slender seta anteroventrally near base; middle tibia with a small indistinct dorsal seta; hind tibia with 2 or 3 small indistinct dorsals. Foretarsus (Figure 181) with segments 1 and 2 rather compressed, 3 flattened with a small black spicule posteriorly near base, 4 and 5 slightly flattened, lengths of segments from base as 7-4-6-4-5; middle tarsus as 8-6-5-4-5; hind tarsus as 10-9-7-5-5.

Wing (Figure 176) elliptical, with evenly rounded hind margin, rather clear; vein 2 slightly and evenly arched, curved only slightly forward at tip; vein 3 straightened distally, ending slightly before wing tip; crossvein two-thirds to three-fourths as long as last of vein 5. Knob of halter black.

Abdomen (Figure 179) about as long as thorax, cylindrical to rather compressed, brown with blackish pollen, setae dark; sternites without auxiliary genitalia, but sternite 5 distinct with numerous small dark setae. Hypopygium small, capping tip of preabdomen, brown; with short brownish dense short-pubescent lamellae below; slender sharply pointed pale brownish inner appendage scarcely visible.

FEMALE.—Similar to male but face distinct to mouth, lower part as wide as antennal segment 1; antennal segment 3 more shortly pointed; femora without distinctive ventrals; foretarsus plain; crossvein of wing (Figure 177) nearly as long as last part of vein 5.

TYPE-DATA.—Holotype ♂ and allotype ♀ from Mexico: Oaxaca, Sierra Juarez, Route 175 near 95 km marker, roadside spring in rain forest area at medium elevation, 17 May 1963, H. Robinson (USNM 70321). Paratype: same general locality as holotype, 104 km marker, wet shaded rocky ravine, 19 May 1963, 1 ♂.