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U.S. NATIONAL MUSEUM BULLETIN 2 77 



Female. — Head red-brown, longer than high; eyes dark red-brown, 

 postocular flange broad but abruptly ending at lateral margin of eye; 

 frons elevated above the antennae, narrow, no wider than the median 

 ocellus; ocellar tubercle prominent, not sharply cut off from frons; 

 ocelli red; back of head granular, subgenal and postlateral areas 

 extensive, shining; mouthparts red-brown, three-fourths the length 

 of the oral opening; palpi half as long. Antennae red-brown, the third 

 segment small, oval. 



Figure 164. — Pseudatrichia longiventris, new species, male, female: a, male wing; h, female 

 wing; c, d, lateral aspects of male and female head; e, dorsal aspect of female head; /, 

 lateral aspect of 7th, 8th, and 9th segments of male; g, lateral aspect of male terminalia; 

 h, posterior aspect of male terminalia; i, ventral aspect of male terminalia; ;, ventral 

 aspect of female 8th sternum and 9th segment; k, lateral aspect of female 8th and 9th 

 segments. 



Thorax dorsum red-brown, elongate, elevated into a blunt point 

 behind the head, depressed posteriorly in front of the scutellum; 

 humeral and supra-alar calli orange-brown; scutellum orange-brown; 

 pleural areas orange-brown. Wings brown, smoky, long and narrow; 

 veins red-brown; halter stem brown, knob brown. Fore and middle 

 legs orange-brown; hind leg with coxa orange-brown, remainder 

 red-brown. 



Abdomen red-brown, granular, subshining, with lateral margins 

 of tergites black. Eighth segment red-brown, shining, very elongate, 

 hairy, sternum ending in three points; see figure for details. 



Length: Male body 8.5 mm., wing 4 mm.; female body 6.5 mm., 

 wing 3.7 mm. 



