88 ( 86 ). 
89 ( 88 ). 
90 (89). 
91 (90). 
92 (91). 
93 (92). 
(fig. 1257), pupation normally externally but 
puparium sometimes remains in leaf at end of 
mine; puparium yellowish brown, posterior spir- 
acles each with about 17 bulbs. 
Distribution. California, Washington; Canada, 
Europe . 
References. Spencer, 1969a: 226; 1981: 369. 
Frons uniformly pale brown 
Napomyza marginal is (Frost) 
(Frons considered as pale, see couplet 39.) 
Frons darker, uniformly black or at least black 
on lower half, sometimes more yellowish above — 89 
Arista conspicuously thickened (fig. 1143) 
_P. crassiseta Zetterstedt 
(Melanie form, frons normally pale yellow, see 
couplet 31.) 
Arista normal 90 
2 d costal section long, at least 3-4 times 
length of 4th 91 
2 d costal section shorter, 2-3 times length of 
4 th 95 
Acr numerous, in 6—8 rows; large species, wing 
length 2.8-3. 3 mm J?. ilicis Curtis 
(Frons generally paler, see couplet 51.) 
Acr sparser, at most in 4-5 rows 92 
2 ors, 2 ori 93 
2 ors, 3 ori Chroma tomyi a montana Spencer 
(if frons treated as pale, see couplet 51.) 
Synopsis. Lower half of frons, lunule, and or- 
bit dark, brown to blackish, upper half of 
frons and orbit paler, more yellowish; gena 
ochreous, face gray; 3d antennal segment black, 
1 st and 2 d faintly paler; mesonotum matt gray- 
ish black, acr in 4 rows; side of thorax with 
front of humerus and upper margin of mesopleur- 
on yellowish, otherwise black; legs black, with 
only foreknee narrowly yellow; squama yellowish 
gray, fringe black; wing length 2 . 5 - 2.8 mm in 
male (female unknown), 2 d costal section from 3 
to about 4 times length of 4th; male genitalia 
with aedeagus (fig. 1258) having 2 pairs of 
supporting sclerites, lower pair diverging by 
900 . 
Host/Early Stages. Unknown, probably a grass 
feeder. 
Distribution. Northern California. 
Reference. Spencer, 1981: 445. 
Antenna black; large species, wing length 2. 7-3. 3 
111111 Chroma tomyi a involucratae (Spencer) 
Synopsis. Orbit and lower frons blackish, frons 
on upper half frequently paler, ochreous; gena 
pale brown, 0.33 height of eye; mesonotum black- 
ish gray, acr in 4 or 5 rows; side of thorax 
dark; /legs black, only foreknee distinctly yel- 
lowish^; squama whitish yellow, margin and 
fringe dark; wing with 2 d costal section long, 
205 
