Neosilba, Neosilba fuscipennis
Lonchsa fuscipennis, new species
Wings grayish brown, paler behind; no hairs surrounding the stigmatal bristle;
legs blackish. Length, 5 mm.
MALE.-Head black, face with cinereous pollen, the cheeks and occiput very
thinly gray pollinose. Front opaque black, the sides shining above, scarcely half
as wide as long, narrowing anteriorly, with rather abundant and fairly long hair.
Cheeks scarcely visible from lateral view. Palpi black, broad. Antennre black, longer
than the face, the third segment more than four times as along as wide; arista very
broadly yellowish basally, pubescent.
Thorax shining black, the dorsum appearing brown from anterior view; hair
fairly long and abundant. No hairs surrounding the stigmatal bristle. Scutellum
with numerous marginal hairs and a pair between the apical bristles.
Legs blackish; middle femora rather closely ciliate posteriorly toward the lower
edge, with a row of poorly differentiated bristles in front; posterior femora without
strong bristles.
Wings grayish brown, paler behind on the basal half. Squamt grayish yellow,
the border of the upper lobe brown, the fringe yellow with long black hairs on the
outer portion. Halteres brown.
Abdomen brownish black with the sides and apex very broadly shining black.
Venter brown, with brownish pollen. Hair black, no bristles.
TYPE.-Male, Barro Colorado Island, Canal Zone, February 13, 1929 (Curran).