lanceolata and major . Larva forming long, nar- 
row, white linear mine, pupating in leaf; pu- 
parium whitish gray, anterior spiracles pro- 
jecting through epidermis, posterior spiracles 
with ellipse of about 12 bulbs. 
Distribution. Widespread through most of 
United States; new record: Arkansas, Garland 
Co., Hot Springs, 2 f., 17.V.79 (KAS); Canada, 
Europe, Japan. 
References. Frick, 1959: 434; Spencer, 
1969a: 268; 1981: 413. 
49 (32). 3d antennal segment with conspicuously long 
pubescence (figs. 1180, 1181) 
Chromatomyia lactuca (Frost) 
Synopsis. Frons, gena, and face yellow, orbit 
paler, whitish yellow, 2 equal ors, 1 ori; 3d 
antennal segment black, enlarged in female (fig. 
1181), 1st and 2d segments yellow or yellowish 
brown; mesonotum matt gray, acr in 2 rows; legs 
black, with all knees bright yellow; squama 
yellow, margin and fringe dark; wing length 
2. 1-2.8 mm, 2d costal section 2.5 times length 
of 4th; male genitalia with aedeaguas as in 
figures 1182, 1183. 
Host/Early Stages. Crepis , Lactuca , Sonchus , 
and Taraxacum , possibly other genera in the 
subtribe Crepidinae of the tribe Cichorieae. 
Larva forming long linear mine on lower sur- 
face, pupating in leaf; puparium yellowish to 
reddish brown, posterior spiracles each with 
ellipse of 14—20 bulbs on large conical 
protuberance (leaf mine illustrated by Needham, 
Frost, and Tothill, 1928: fig. 84, and 
Griffiths, 1977: fig. 14). 
Distribution. California, Michigan, New York, 
Pennsylvania; Canada; new record: Maryland, 
Montgomery Co., Bethesda, 4m., 4 f., emerged 
26. VI. 80 from leaf mines, coll. 24. VI. 80 on 
Lactuca biennis (Moench) Fern. (USNM). 
References. Griffiths, 1974a: 37; 1977: 336; 
Spencer, 1981: 442. 
3d antennal segment with shorter, normal pu- 
bescence 50 
50 (49). Frons yellow above, brown below 51 
Frons uniformly yellow 52 
51 (50). Acr numerous, in 6-8 rows P. ilicis Curtis 
(If frons considered as brown, see couplet 91.) 
Synopsis. Frons variable in color, generally 
somewhat brownish in front, more yellow behind; 
gena 0.33 height of eye; all antennal segments 
black; mesonotum matt black, with acr numerous; 
legs black, even foreknee scarcely paler; squa- 
ma gray, margin and fringe black; wing length 
2. 8-3. 3 mm, 2d costal section long, 3.5-4 times 
length of 4th; male genitalia with aedeagus as 
in figures 1184, 1185. 
191 
