59 (55). 2 ori P. wahlgreni Ryddn 
Synopsis. Frons yellow, sometimes slightly 
orange centrally, orbit scarcely darkened; nor- 
mally 2 strong equal ors, 2 ori, orbital setulae 
sparse; hindmargin of eye narrowly yellow or 
grayish; 3d antennal segment round, relative- 
ly large, black, 1st and 2d generally paler, 
somewhat yellowish; mesonotum matt gray, acr 
irregularly in 2-3 rows; side of thorax dark, legs 
black, all knees bright yellow; squama yellowish 
gray, margin and fringe black; wing length 2.5-3. 3 
mm in male to 3. 1-3.5 mm in female, 2d costal 
section about 2.5 times length of 4th; male 
genitalia with aedeagus as in figures 1199, 1200. 
Host/Early Stages. Taraxacum . Larva feeding in 
midrib, producing gall-like swelling; puparium 
whitish, remaining at base of midrib. 
Distribution. Colorado (new record). 
References. Spencer, 1976a: 526; part 2, p. 322. 
1 ori, at most minute setula below 60 
60 (59). Forecoxa yellowish; orbit darkened to lower ors 
P. coloradella Spencer, n. sp . 
Synopsis. Frons twice width of eye, yellowish 
orange; gena extended at rear, almost 0.33 height 
of eye, parafacial prominent; 3d antennal segment 
black, slightly enlarged, 1st and 2d somewhat 
paler; mesonotum matt gray, acr in 2 rows; legs 
black, apart from yellowish forecoxa and narrowly 
yellowish knees on all femora; squama gray, margin 
and fringe black; wing length in male 2.5 mm, 2d 
costal section twice length of 4th; male genitalia 
with aedeagus as in figures 1201, 1202. 
Host/Early Stages. Unknown. 
Distribution. Colorado. 
Reference. Part 2, p. 314. 
Forecoxa dark; orbit entirely yellow 61 
61 (60). Knees narrowly indistinctly yellowish 
_P. alamedensis Spencer 
Synopsis. Frons broad, twice width of eye, 
bright yellow; gena yellow, antenna, face, and 
palpus black; mesonotum matt gray, acr in 2 
rows; legs largely blacky apart from narrowly 
yellow knees; squama gray, margin and fringe 
black; wing length in male 2.3 mm, 2d costal 
section twice length of 4th; male genitalia 
with aedeagus as in figures 1203, 1204. 
Host/Early Stages. Unknown. 
Distribution. Central California. 
Reference. Spencer, 1981: 371. 
Knees more conspicuously yellow 62 
62 (61). 2d costal section long, 3 times length of 4th 
Chroma tomyi a montella Spencer, n. sp. 
Synopsis. Closely resembling P. alamedensis but 
frons broader, almost 3 times width of eye, 3d 
antennal segment slightly longer than broad, 
wing with 2d costal section longer, length in 
195 
