ly bare _P . saximontana Griffiths 
Synopsis. Frons distinctly projecting above eye 
(types from Alberta, scarcely so in specimens 
from California); orbit with 1 ors and normally 
3 ori; 3d antennal segment black, 2d similar, 
1st at most faintly paler; mesonotum matt gray, 
acr in 3-5 rows; side of thorax dark, only up- 
per margin of mesopleuron narrowly yellow; legs 
black, all knees conspicuously yellow; squama 
pale, margin and fringe black; wing length 
2. 2-2.6 mm in male to 2.25-2.9 mm in female, 2d 
costal section 2-2.5 times length of 4th; male 
genitalia with aedeagus as in figure 1224. 
Host/Early Stages. Arnica , including A. mollis . 
Larva forming irregular linear mine (fig. 1225) 
which can considerably widen toward end and be- 
come almost blotchlike; puparium brown, poste- 
rior spiracles each with 17-23 bulbs. 
Distribution. California (mountains); Canada. 
References. Griffiths, 1974b: 112; Spencer, 
1981: 420. 
3d antennal segment small, round, with distinct 
pubescence at upper corner 
P. asterophaga Spencer 
Synopsis. Frons yellow, not projecting above 
eye, with 1 strong ors at center of frons, 2 
ori, lower weak; orbit entirely yellow; meso- 
notum blackish gray, acr irregularly in 4 rows; 
legs black but all knees yellow, tibiae and 
tarsi paler, brownish; squama yellow, margin 
and fringe dark; wing length 2. 3-2.8 mm, 2d 
costal section 2. 5-3. 5 times length of 4th; 
male genitalia with aedeagus as in figures 
1226, 1227, divided distiphallus pale, apart 
from small area of pigmentation at base. 
Host/Early Stages. Aster conspicuus . Larva 
forming narrow, linear upper surface mine (fig. 
1228) , with frass in small grains or discon- 
nected strips; puparium dull black, posterior 
spiracles each with ellipse of 12-15 bulbs. 
Distribution. North Carolina (new record); 
Canada. 
References. Spencer, 1969a: 230; Griffiths, 
1976b: 244; part 2, p. 310. 
72 (66). Squamal fringe pale, yellow 73 
Squamal fringe dark, brown or black 74 
73 (72). 2d costal section short, 1.5 times length of 
4th; orbit uniformly gray; acr in 2 rows 
p. boulderella Spencer, n. sp. 
Synopsis. Frons orange yellow, normal arrange- 
ment of orbital bristles probably 2 ors, with 
upper weaker, 1 or 2 ori; 3d antennal segment 
black, large; mesonotum ash gray; legs black, 
only knees yellow; squama and fringe yellow; 
wing length in male 2.1 mm; male genitalia with 
aedeagus as in figures 1229, 1230. 
199 
