fringe white; male genitalia unknown. 
Host/Early Stages. Unknown. 
Distribution. Texas. 
Reference. Part 2, p. 259. 
9 (6). Male without vibrissal fasciculus 10 
““ Male with distinct vibrissal fasciculus (see figs. 
221, 235) 24 
10 (9). Prominent, raised facial keel present 19 
Facial keel lacking or if present, linear and 
scarcely raised 11 
11 (10). Male with conspicuous fringe of peristomal hairs 
(figs. 181, 184) 12 
Vibrissa and peristomal hairs normal 13 
12 (11). Vibrissa not differentiated from peristomal hairs, 
these numerous, mostly equal (fig. 181) 
q. i auta (spencer) 
Synopsis. Appearing generally as a Melanagromyza 
but correct generic position indicated by male 
genitalia (figs. 182, 183); fringe of peristomal 
hairs distinctive; ocellar triangle scarcely 
shining; mesonotum and abdomen moderately shining; 
squama gray, margin and fringe black. 
Host/Early Stages. Unknown. 
Distribution. Georgia (new record), Michigan; 
Canada. 
References. Spencer, 1969a: 70; Steyskal, 1972b: 
2; part 2, p. 255* 
Vibrissa strong, peristomal hairs strong numerous, 
becoming weaker toward rear (fig. 184) 
0 . congregata (Malloch) 
Synopsis. Wing length 2. 4-2. 5 mm; ocellar tri- 
angle, mesonotum, and abdomen shining black; 
arrangement of peristomal hairs distinctive; male 
genitalia with aedeagus as in figures 185, 186. 
Host/Early Stages. Unknown. 
Distribution. Arizona, Colorado (new record); 
Canada. 
References. Malloch, 1913a: 328; part 2, p. 254. 
13 (11). Mesonotum and abdomen entirely black 14 
Mesonotum and abdomen at least slightly greenish 22 
14 (13). Ocellar triangle weakly shining 15 
— Ocellar triangle brilliantly shining 17 
15 (14). 2 ori (see couplet 5) 0. similata (Malloch) 
3 ori 16 
16 (15). Last section of vein M 3+4 0.67 length of penulti- 
mate 0 . frosti Spencer, n. sp. 
Synopsis. Small black species, without vibrissal 
fasciculus in male or raised facial keel; male 
genitalia with aedeagus as in figures 187, 188. 
Host/Early Stages. Unknown, probably leaf miner 
on Asteraceae. 
Distribution. New York. 
Reference. Part 2, p. 255. 
— Last and penultimate sections of M 3+4 equal 
0. t iliae (Couden) 
Synopsis. Frons 1.5 times width of eye, not pro- 
41 
