Synopsis. Head largely yellow but eye margin may 
be narrowly black; mesonotum entirely yellow 
adjoining scutellum, central yellow area quadrate, 
dark area blackish gray, only weakly shining; acr 
in 4 rows in front, at most isolated hairs on yel- 
low area; mesopleuron black on lower 0.75; legs 
with femora bright yellow, tibiae and tarsi black; 
abdomen with all tergites broadly yellow bordered; 
wing with discal cell large, last section of vein 
M 3+4 1.5 times length of penultimate; male geni- 
talia with aedeagus as in figures 992, 993; epan- 
drium with numerous bristles along inner margin 
(fig. 994); sperm pump with blade dark, broader 
than long. 
Host/Early Stages. Unknown. 
Distribution. Michigan (new record); Canada. 
References. Spencer, 1969a: 171; part 2, p. 302. 
Smaller species, wing length at most 2.2 mm 15 
15 (14). Mesonotum predominantly matt gray, with central 
area adjoining scutellum yellow P. pallida (Sehgal) 
Synopsis. Frons, orbit, entire hindmargin of eye, 
and antenna yellow; 2 ors, 1 or 2 ori, orbital 
setulae sparse, proclinate; mesonotum largely matt 
gray, with V-shaped or rectangular area adjoining 
scutellum yellow; scutellum and pleura largely 
yellow; legs with femora yellow, tibiae and tarsi 
darker, brownish; squama yellowish, margin and 
fringe dark; wing length 2. 4-2. 6 mm, last section 
of M 3+4 twice length of penultimate; male geni- 
talia with aedeagus as in figure 995; epandrium 
and surstylus with distinctive arrangement of 
bristles (fig. 996). 
Host/Early Stages. Unknown. 
Distribution. Montana (new record); Canada. 
References. Sehgal, 1968: 72; Spencer, 1969a: 195; 
part 2, 304. 
— Mesonotum banded, yellow and gray P. melampyga (Loew) 
Synopsis. Head entirely yellow, including entire 
hindmargin of eye; 2 ors, 2 ori, orbital setulae 
reclinate at rear, more incurved below; mesonotum 
with 3+1 strong dc, acr irregularly in 3 or 4 
rows, matt gray, banded, with broad central area 
adjoining scutellum yellow; legs and scutellum 
largely yellow; squama yellow, margin and fringe 
black; halter yellow; wing length 2.2 mm, discal 
cell large, last and penultimate sections of M 3+4 
approx, equal; male genitalia with aedeagus (fig. 
997) ending in long, coiled tubules which are 
entirely unpigmented, curvature of coil changing 
at midpoint; epandrium with 4 bristles on inner 
margin, surstylus with comb of about 12 black 
bristles (fig. 998). 
Host/Early Stages. Impatiens capensis , j[. noli- 
tangere . Larva forming whitish linear blotch mine 
(fig. 999) with frass in irregular black lumps. 
Distribution. District of Columbia, Maryland, 
157 
