angulata, separable from former by male genitalia 
and from latter by black squamal fringe; male geni- 
talia with hindcorner of epandrium having patch of 
strong bristles and row of long hairs along lower 
margin (fig. 578). 
Host/Early Stages. Unknown. 
Distribution. North Carolina. 
Reference. Part 2, p. 279. 
5 (3). Gena broad, almost 0.25 height of eye 
C, (B.) impolita Spencer, n. sp. 
Synopsis. Frons broad, twice width of eye; 2 ors, 2 
ori; 3d antennal segment slightly longer than broad, 
arista appearing bare; legs largely black, only 
foreknee narrowly yellow; wing length in male 2.1 mm, 
last and penultimate sections of M 3+4 equal, inner 
crossvein at midpoint of discal cell; male genitalia 
with aedeagus (fig. 579) having distal tubules short 
with distinctive curvature, diverging; sperm pump 
with broad stalk and narrow blade (fig. 580). 
Host/Early Stages. Unknown, almost certainly Carex. 
Distribution. Colorado, North Carolina. 
Reference. Part 2, p. 281. 
Gena narrower, 0.17-0.10 height of eye 6 
6 (5). Frons broad, twice width of eye 
- C. (B. ) impercepta Spencer, n. sp. 
Synopsis. 3d antennal segment black, small, round, 
without noticeable pubescence, 2d slightly yellowish; 
arista distinctly pubescent; legs largely black, 
only foreknee narrowly yellow; wing length in male 
2.3 mm, last section of M 3+4 slightly longer than 
penultimate, inner crossvein slightly beyond center 
of discal cell; male genitalia with aedeagus (figs. 
581, 582) having distal tubules paler toward end, 
distinctly diverging; sperm pump pale, fanlike. 
Host/Early Stages. Unknown, almost certainly Carex. 
Distribution. North Carolina. 
Reference. Part 2, p. 280. 
Frons narrower, at most 1.5 times width of eye 7 
7 (6). Outer crossvein more than own length from inner 
7 (b. ) angulata ( Loew) 
Synopsis. Frons 1.5 times width of eye, brownish 
black, orbit black, not widening toward base of 
antennae; 2 ors, 2 ori; 3d antennal segment small, 
round in both sexes, with small tuft of hairs at 
upper corner; 3+1 strong dc, prsc variable, fre- 
quently well developed; legs with femora black, 
knees variable, yellowish on foreleg, sometimes also 
distally paler on midleg and hindleg; squama and 
fringe invariably yellow, rarely somewhat darker; 
male genitalia with aedeagus (figs. 583, 585, 586) 
having distal tubules rising almost vertically from 
mesophallus and conspicuously widening distally; 
sperm pump pale, fanlike; inner corner of epandrium 
with patch of short bristles (fig. 584). 
Host/Early Stages. Carex spp. Larva forming long, 
narrow, yellowish mine, pupating externally, with 
99 
