Helianthus , Lactuca , Melanthera , Senecio, 
Solidago , Sonchus , and Tagetes . Larva forming 
large blotch mine (fig. 496) and frequently 
feeding together; puparium brown, posterior spir- 
acles each with 3 bulbs. 
Distribution. Widespread from Florida to New York 
and Wisconsin, present in all southern States, 
common in California; common in Caribbean area, 
extending to Brazil, Chile, and Argentina; 
Canada, Hawaii. 
References. Stegmaier, 1967a: 99; Spencer and 
Stegmaier, 1973: 94; Spencer, 1981: 144. 
Note. The blotch mines of this species may be 
confused with those of Nemori myza posticata (fig. 
539), but the adults can hardly be confused. 
(4) . Mesonotum entirely matt, grayish g 
Mesonotum shining black 
7 — m ( Cephalomyza ) lucens Spencer 
Synopsis. Frons brownish black, distinctly above 
eye (fig. 497); orbital bristles slender, 2 ors, 2 
ori; gena extended at rear, 0.33 height of eye; 3d 
antennal segment small, round mesonotum and scu— 
tellum deep black, moderately shining; 3 strong 
postsutural dc, additional bristles beyond in 
presutural area minute, scarcely differentiated 
from acr, these in 4 rows; wing length in female 
1.5 1.6 mm, last section of M 3+4 from twice to 
less than 1.5 times penultimate; male genitalia 
unknown . 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 154. 
(5) . Gena extended at rear, 0.33 height of eye 
A. ( Cephalo myza) nevadensis Spencer 
Synopsis. Frons brownish black, about 1.5 times 
width of eye, orbit blacker; normally 2 ors, 3 
ori; gena 0.33 height of eye at rear; 3d antennal 
segment small, round; mesonotum gray black, dc 
irregular, 2+3 or 3+4, additional presutural ones 
distinctly stronger than acr, these irregularly in 
4 rows; pleura and legs black; squama gray, mar- 
gin and fringe black; halter and stalk black, 
knob blackish below, white above; wing length 
2-2.1 mm, last section of M 3+4 from 1.5 to 2 
times penultimate; male genitalia with aedeagus as 
in figures 498, 499. 
Host /Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 155. 
Gena narrower, 0.14 height of eye 
7 ( Cephalomyza ) subinfumata (Mai loch) 
Synopsis. Small black species, closely resembling 
A. (C. ) nevadensis but gena distinctly narrower, 
only 3+1 dc; male genitalia with aedeagus as in 
figures 500, 501; sperm pump (fig. 502) with very 
large blade. 
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