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Genus TRICOGENA Rond. 
Tricogena Rondani, Dipterologin' Italics Prodronius, Vol. I, p. 88; 1856. 
Frauenfel dia Egger, Verhand. Kais.-Kon. Zool.-Botan. Gesell., Vol. XV, p. 297; 1865. 
This synonymy is according to Brauer and Bergenstauim : l 
Palpi yellow, insect elsewhere black; front of female one and one- 
fonrth times as wide as either eye, two pairs of orbital bristles, 
frontal bristles descending to the arista, sides of face each at 
narrowest part one-half as wide as the facial depression, each 
bearing two downwardly curving macrochaetae, the lowest of 
which is nearly on a level with lower ends of eyes, cheeks two 
fifths as wide as the eye-height, vibrissas slightly above the oral 
margin, one or two bristles above each; antennas four- fifths as 
long as the face, the third joint only slightly longer than the 
second, arista thickened on the basal fourth, the penultimate 
joint broader than long; thorax whitish pollinose, not distinctly 
vittate, three postsutural and two sternopleural macrochsetae, 
scutellum bearing three long marginal pairs, abdomen shining, 
the bases of the second and third segments whitish pollinose, 
first three segments bearing marginal macrochaetae ; middle tibiae 
each bearing two on the front side near the middle: wings whitish 
hyaline, the costal edge brownish, third vein bearing two bristles 
at the base, hind crossvein midway between the small and the 
bend, petiole of apical cell slightly shorter than the small cross- 
vein, calypteres white; length, 5 mm. Colorado. A female 
specimen. Type No. 3635, U. S. National Museum . costalis n. sp. 
Palpi black, insect elsewhere black; front of female almost as wide as 
cither eye, frontal bristles descending slightly below base of 
first antenna] joint, sides of face at narrowest part each one-fifth 
as wide as the median depression, each bearing a row of macro 
chaetae and scattered black hairs, cheeks nearly one- third as 
broad as the eye height, antenna' three-fourths as long as the 
face, the third joint twice as long as the second; body with a 
strong brassy tinge, three sternopleural macrochaetae, bases of 
last three segments of abdomen whitish pollinose; wings hya- 
line, the portion in front of fifth vein tinged with yellowish, 
especially along the veins and crossveins, third vein bristly 
almost to the small crossvein; length, 7 mm., otherwise as in 
the above description of costalis. Franconia, N. H. A single 
female specimen collected by Mrs. A. T. Slosson. Type No. 
3636, U. S. National Museum setipennis n. sp. 
Zweif. Kais. Mns.Wien,Vl, p. 238; 1893. 
