Key to Ophiomyia 
Species 
1. Halter variegated, white on upper half, black 
below 0 . maculata Spencer 
Synopsis. Wing length in male 2.5 mm; gena broad, 
0.33 height of eye; vibrissal fasciculus in male 
short, uniformly curving; mesonotum and abdomen 
moderately shining, with faint coppery tinge; 
squama dark gray, fringe black; male genitalia 
with aedeagus as in figures 159, 160. 
Host /Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 89. 
Halter uniformly dark, brown or black 2 
2 (1). Costa ending at or just beyond vein R 4+5 3 
Costa extending strongly to M 1+2 6 
3 (2). Squama and fringe whitish 0. banf fensis Spencer 
Synopsis. Wing length 1.9-2. 2 mm, last section of 
M 3+4 longer than penultimate, in ratio 20:15; 
frons slightly wider than eye, not projecting 
above eye; 2 ors, 2 ori; gena slightly projecting 
forward (fig. 161); facial keel narrow but high; 
ocellar triangle, mesonotum, and abdomen bril- 
liantly shining black; male genitalia with aedea- 
gus as in figures 162, 163 (holotype). 
Host/Early Stages. Unknown. 
Distribution. Colorado (new record); Canada. 
References. Spencer, 1969a: 84; part 2, p. 252. 
Squama gray, fringe black 4 
4 (3). Facial keel broad 0. monticola Sehgal 
Synopsis. Wing length from 2.1 mm in male to 2.7 
mm in female, last section of M 3+4 slightly 
longer than penultimate; frons broad, twice width 
of eye, not projecting above eye; 2 ors, 2 
(occasionally 3) ori; gena distinctly projecting 
forward (fig. 164); male with single slender 
vibrissa, no fasciculus; facial keel broad but 
flat, with distinct furrow above; mesonotum 
shining black; squama pale gray, margin black, 
fringe whitish ochreous; male genitalia with ae- 
deagus as in figures 165, 166. 
Host /Early Stages. Unknown. 
Distribution. Colorado (new record); Alaska, 
Canada. 
References. Sehgal, 1968: 60; Spencer, 1969a: 90; 
part 2, p. 256. 
Facial keel sharp 5 
5 (4). Orbit and parafacial brilliantly shining black 
0. simplex (Loew) 
Synopsis. Medium-sized, shining black species, 
wing (fig. 167) length 2.2-3 mm; gena broad, not 
projecting forward; normally 2 strong dc , small 3d 
and 4th rarely also present; squama gray, margin 
and fringe black; male genitalia with aedeagus 
as in figures 168, 169. 
Host/Early Stages. Asparagus officinalis . Larva 
external stem miner; puparium pale or darker 
brown, posterior spiracles each having about 16 
bulbs (fig. 170). 
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