1 
Key to Phytomyza A. Outer crossvein present (fig. 1085) 
and Chroma tomyi a 1. Male genitalia with aedeagus in ventral view 
Species^*/ as in figure 1083 P . davisii (Walton) 
Synopsis. Frons , gena, and face yellow, upper 
orbit darkened; 2 ors, lower weaker; all an- 
tennal segments black; mesonotum matt gray, 
acr in 4 rows; legs black, all knees yellow; 
squama and fringe yellow; wing length in male 
about 2.7 mm, outer crossvein slightly beyond 
inner (see fig. 1085), 2d costal section 
long, 3.5 times length of 4th; male genitalia 
with aedeagus as in figures 1082, 1083; sperm 
pump large. 
Host/Early Stages. Ranunculus abort ivus . 
Larva forming blotch mine (fig. 1084), ad- 
joining margin of leaf, pupating externally 
through upper surface exit slit; puparium 
dark brown, all segments covered with broad 
band of spicules, posterior spiracles on 
widely diverging conical projections, each 
with circle of about 20 minute bulbs. 
Distribution. Indiana, Michigan, Montana, 
Wisconsin; new records: Minnesota, Hennepin 
Co., Minneapolis, 1 m. , 20.V.77, ex leaf mine 
3.V.77 (KAS); New York, Ithaca, 1 f., 4. VIII. 16 
(CUI); Canada. 
Reference. Spencer, 1969a: 238. 
Male genitalia with aedeagus in ventral view 
as in figure 1087 P. duplex Spencer , n. sp. 
Synopsis. Externally as in P. davisii , gena 
possibly broader, 0.33 height of eye; wing as 
in figure 1085; male genitalia with aedeagus 
as in figures 1086, 1087. 
Host/Early Stages. Unknown, certainly Ranuncu- 
laceae . 
Distribution. Tennessee. 
Reference. Part 2, p. 315. 
B. Outer crossvein lacking (fig. 1109) 1 
1. Frons predominantly pale, yellow or orange, 
including adjoining lunule 2 
— Frons darker, black or brown, at least in 
front 82 
2 (1). Scutellum at least partially yellow 3 
— Scutellum entirely dark 12 
3 (2). Very large species, wing length in female 4 mm 
P . splendida Spencer 
Synopsis. Head yellow, frons exceptionally 
broad, 4 times width of eye, strongly pro- 
jecting above eye in profile; 1st antennal 
segment yellow, 2d and probably 3d (this 
missing in only available specimen) black; 
mesonotum (fig. 1088) with 5 matt black bands, 
entirely yellow adjoining scutellum; side of 
Includes 3 Napomyza species with outer crossvein lacking. 
175 
