Hoosier Pass, 12,000 ft, willow 
tundra, 8. VIII. 61 (J. G. Chillcott); 
paratype m. , Clear Creek Co., Mt. 
Evans, 11,300 ft, wet vegetation, 
10. VIII. 61 (C. H. Mann); both in CNC. 
Remarks. The male genitalia indicate 
that this distinctive species belongs 
to the ]P. robustella group . 
Phytomyza flavinervis Frost 
(Figs. 1139, 1140) 
Phytomyza flavinervis Frost, 1924: 
85. Lectotype female (designated 
here) from Texas in USNM. 
Only the male and female syntypes are 
known of this species. Unfortunately 
the male lacks its head and the end of 
the distiphallus appears to be broken 
(the genitalia were extruded). How- 
ever, the illustrations given will 
suffice to establish the identity of 
the species. The female is in perfect 
condition and is hereby designated as 
lectotype . 
Phytomyza flexuosa Spencer, new species 
(Figs. 1231, 1232) 
Head. Frons broad, twice width of 
eye, not projecting above eye in 
profile; 2 strong ors but upper 
distinctly weaker, 2 ori, lower weak, 
orbital setulae sparse, in single row; 
gena 0.33 height of eye; 3d antennal 
segment rounded, rather large. 
Mesonotum. Acr irregularly in 4 rows. 
Wing. Length in male 2.5 mm, 2d 
costal section long, 3 times length 
of 4th. 
Color. Frons, gena, and face clear 
yellow, upper orbit yellow below upper 
ors, black above, confluent with 
hindmargin of eye; mesonotum and 
scutellum blackish gray; legs with 
femora black, knees broadly yellow, 
tibiae and tarsi yellowish brown; 
squama, including margin and fringe, 
yellow. 
Male genitalia. Aedeagus (figs. 1231, 
1232) with distiphallus divided into 2 
tubules with distinctive curvature; 
sperm pump large, with blade broader 
than long, base with points of strong 
sclerotization at each end. 
Host/early stages. Unconfirmed, 
probably Ranunculaceae . 
Holotype m. , Washington, Benton Co., 
Prosser, sweeping Erigeron canadensis , 
27. VIII. 48 (K. E. Frick, Lot 215 - 1), 
in CAS. 
Remarks. This species closely 
resembles both JP. davisii and 1?. 
duplex (see genitalia figs. 1083, 
1087), but in both these species the 
outer crossvein is present (fig. 1085). 
Although the unique holotype was 
caught on " Erigeron 11 (= Conyza ) 
canadensis , it is believed that the 
host is in the Ranunculaceae. 
Phytomyza genalis Melander 
(Figs. 1115, 1116) 
Phytomyza genalis Melander, 1913: 
272. Lectotype male from Illinois, 
designated by Frick (1957b: 205), in 
USNM. 
This species is distinctive in having 
the 3d antennal segment yellowish, the 
mesonotum matt gray, and the side of 
the thorax largely yellow. In the 
male genitalia (figs. 1115, 1116) the 
distiphallus is a membranous, dorsally 
directed tubule with equal lateral 
extensions at the midpoint; the 
ventral lobe is well developed but 
also membranous. 
Phytomyza latifrons Spencer, new 
species 
(Figs. 1190, 1191) 
Head. Frons exceptionally broad, 
almost 3 times width of eye, distinctly 
projecting above eye in profile; 2 
equal ors, 3 strong ori, sometimes a 
smaller 4th present, orbital setulae 
sparse, in single row; gena broad, 
slightly more than 0.5 height of eye, 
parafacial prominent, occupying 
0.75 distance between lower margin of 
gena and eye margin; 3d antennal 
317 
