variable, from 1.5 to 2 times width of eye; gena 
variable, normally forming angle of about 80° 
(fig. 293), rarely more acute, forming angle of 
about 60° (couplets 40, 43); vibrissal fascicu- 
lus in male strong at base but tapering and very 
fine at end; facial keel of variable width but 
never with furrow; wing length from 1.75 mm to 2.3 
mm; male genitalia with aedeagus (figs. 294, 295) 
having distinctive cylindrical projection at rear 
of distiphallus complex. 
Host/Early Stages. Brassicaceae , recorded from 
stem mine in Ror ippa sp. and De scurainia sp. 
Distribution. California, Texas; Canada; reported 
by Frick (1959) as widespread from Washington to 
Michigan, but these records require confirmation. 
References. Malloch, 1913a: 319; Frick, 1959: 371; 
part 2 , p. 259. 
Facial keel with conspicuous furrow 53 
53 (52). Ocellar triangle and orbits brilliantly shining 
7 ' 0. melica Spencer 
Synopsis. Closely resembling 0. malitiosa , 
differing primarily in more shining ocellar tri- 
angle and orbits; wing length in male 2.1 mm; 
male genitalia with aedeagus as in figures 296 
297. 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 92. 
Ocellar triangle and orbits only moderately 
shining 0 . malitiosa Spencer 
Synopsis. Frons broad, twice width of eye; gena 
forming angle of 90° (fig. 298), 0.25 height of 
eye; fasciculus in male short, tapering; facial 
keel low, narrow, deeply furrowed; wing length 
2 mm; male genitalia with aedeagus as in figures 
299, 300. 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 91. 
54 (51). Facial keel shining black in upper half 
7 0. labiatarum Hering 
Synopsis. Frons 1.5 times width of eye; gena nar- 
row, 0.20-0.125 height of eye, forming angle of 
70°; vibrissal fasciculus in male long, with 
distinctive curvature (fig. 301); facial keel of 
medium width but distinctly raised and furrowed; 
wing length up to 2.4 mm; male genitalia with 
aedeagus as in figures 302, 303. 
Host/Early Stages. Lamiaceae, genera recorded in- 
clude Calamintha , Galeopsis , Lamium , Nepeta , and 
Stachys (in U.S. only Nepeta ) . Posterior spir- 
acles of larva each with 7 bulbs; pupation occurs 
in stem near node. 
Distribution. Indiana (Spencer, 1964a: 794); wide- 
spread in Canada and Europe. 
References. Spencer, 1964a: 793; 1969a: 87. 
51 
