Frons narrow, little wider than eye 
“ 0 . shastensis Spencer 
Synopsis. Wing length in male 2.5 mm; frons nar- 
row, little wider than eye; gena narrow, 0.17 
height of eye; facial keel inconspicuous; antennal 
bases not widely separated; both mesonotum and 
abdomen distinctly greenish; male genitalia with 
aedeagus as in figures 214, 215. 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 97. 
23 (22). Gena narrow, 0.20 height of eye (fig. 216) 
~ 0 . jacintensis Spencer 
Synopsis. Wing length in male 2.5 mm; frons broad, 
twice width of eye; male with single slender vi- 
brissa; facial keel narrow, only slightly raised 
below base of antennae; male genitalia with ae- 
deagus as in figures 217, 218. 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 85. 
Gena broader, 0.25-0.33 height of eye 
0. yolensis Spencer 
Synopsis. Wing length in male 2.3 mm; frons broad, 
twice width of eye; gena almost 0.33 height of 
eye; facial keel narrow, only slightly raised be- 
low bases of antennae; mesonotum and abdomen 
shining blackish green; male genitalia with 
aedeagus as in figures 219, 220 . 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 100. 
24 (9). Vibrissal angle acute, at most 60° 25 
Vibrissal angle between 70° and 90° 45 
25 (24). Vibrissal angle approx. 45°, conspicuously elon- 
gate, extending beyond antennae 26 
Vibrissal angle approx. 60° 34 
26 (25). Gena broad, 0.5 height of eye (fig. 221) 
0 . praecisa Spencer 
Synopsis. Relatively large species, wing length 
2. 1-2.7 mm; frons projecting above eye; gena pro- 
jecting forward; vibrissal fasciculus in male 
short but broad at base; facial keel narrow with 
slight furrow above; male genitalia with aedeagus 
as in figures 222 , 223. 
Host/Early Stages. Unknown. 
Distribution. California (as 0 . aestimabilis ) ; 
Canada. 
References. Spencer, 1969a: 92; 1981: 69 (as 0. 
aestimabilis ) ; part 2 , p. 256. 
Gena narrower, 0.25-0.33 height of eye 27 
27. 2 ori 28 
3 ori 29 
28 (27). Facial keel broad 0 . apta Spencer 
Synopsis. Frons narrow, equal to width of eye; 
gena 0.25 height of eye, distinctly projecting 
44 
