Synopsis. Upper half of frons and orbit bright 
yellow, frons below and particularly adjoining 
lunule variably darkened, blackish, lunule 
black; gena and face yellow, antenna and palpus 
black; mesonotura and scutellum ash gray; side 
of thorax bright yellow above, black below; 
squama yellowish gray, margin and fringe dark; 
wing with 2d costal section about 2.5 times 
length of 4th; male genitalia with aedeagus as 
in figures 1123, 1124; sperm pump large but 
blade narrow. 
Host/Early Stages. Castilleja latifolia and 
certainly other (3. species. Larva forming 
small linear mine, pupating at end of mine; 
puparium whitish, posterior spiracles each with 
circle of about 12 minute bulbs, anterior spir- 
acles projecting through epidermis. 
Distribution. Central California. 
References. Spencer, 1973b: 34 (Phytomyza 
castillejae ) ; 1981: 436. 
22 (20). Wing with 2d costal section long, 3.5-4 times 
length of 4th p. plumiseta Frost 
Synopsis. Frons and orbit yellow, hindmargin of 
eye and antenna black; mesonotum blackish gray; 
upper half of thorax yellow; wing length about 
2.7 mm; male genitalia with aedeagus as in fig- 
ures 1125, 1126. 
Host/Early Stages. Thalic trum polygamum . Larva 
forming large white blotch, normally in center 
of leaf, with frass in conspicuous black patch 
near center of mine, pupation either in mine or 
externally; puparium dark brown, deeply seg- 
mented. 
Distribution. Pennsylvania; Canada; new record: 
Minnesota, Minneapolis, Minnehaha Creek, 1 f . , 
emerged 21. VII. 80 from leaf mine on Thalictrum 
dasycarpum , coll. 28. VI. 80 (KAS). 
References. Frick, 1959: 434; Spencer, 1969a: 
268. 
2d costal section shorter, at most 3 times 
length of 4th P. aconiti Hendel 
Synopsis. Generally resembling P. plumiseta ; 
male genitalia with aedeagus as in figures 
1127, 1128. 
Host/Early Stages. Aconitum spp.. Delphinium 
spp. Up to 10 or more larvae feed together, 
forming large greenish-brown blotch (fig. 
1129), pupating externally; puparium dark brown. 
Distribution. New York, Ohio, Pennsylvania; 
Canada, Europe. 
References. Frick, 1959: 427 (as P. delphiniae 
Frost); Spencer, 1969a: 223. 
23 (18). Mesonotum ash gray P. cicutella Spencer 
Synopsis. Frons, orbit, and face bright yellow, 
both vt on yellow; upper half of thorax bright 
yellow; legs grayish black with all knees yel- 
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