6 (5). 
7 (6). 
bordered; legs black, all knees yellow; squama and 
fringe yellow; wing length in male 3 mm; male 
genitalia with aedeagus (fig. 596) having distal 
tubules short, diverging. 
Host/Early Stages. Unknown. 
Distribution. North Carolina. 
Reference. Part 2, p. 283. 
Frons twice width of eye 6 
Frons pale brown (3 . (D. ) frosti Spencer 
Synopsis. Frons 1.5 times width of eye, orbit 
conspicuously differentiated, black; lunule semi- 
circular, brownish gray; gena 0.20 height of eye; 
3d antennal segment (fig. 597) enlarged in both 
sexes, all segments black; mesonotum matt black, 
upper margin and hindcorner of mesopleuron orange 
yellow; legs black but all knees yellow; abdomen 
entirely shining black; squama and fringe yellow- 
ish; wing length in female 2.5 mm, last section of 
M 3+4 slightly longer than penultimate, in ratio 
5:4; male genitalia unknown. 
Host/Early Stages. Unknown. 
Distribution. Florida. 
Reference. Spencer and Stegmaier, 1973: 65. 
Frons darker, brown or black 7 
2 ors, 3 ori 8 
2 ors, 2 ori C. (D . ) morosa (Meigen) 
(If knees darker, see couplet 10.) 
Synopsis. Frons brownish black, at most twice 
width of eye, not significantly projecting above 
eye; orbit black; gena narrow, about 0.125 height 
of eye; lunule large, semicircular; 3d antennal 
segment greatly enlarged in male, covered with 
short pubescence; mesonotum grayish black, pleura 
largely dark, notopleuron at most faintly yellow- 
ish, upper margin of mesopleuron narrowly yellow; 
legs black but all femora normally yellow at knees 
for femoral diameter, occasionally darker; abdomen 
largely black; squama and fringe yellow; wing 
length 2. 2-2.4 mm, last and penultimate sections 
of M 3+4 approx, equal; male genitalia with ae- 
deagus (fig. 598) having paired distal tubules not 
diverging, forming large semicircular curve, 
bending slightly downward at apex. 
Host/Early Stages. Carex spp. Larva feeding 
singly, forming long, narrow greenish mine, pu- 
pating internally; posterior spiracles each with 3 
bulbs, lower 2 curving round base of longer, pu- 
parium variable, yellowish, reddish to blackish 
brown. 
Distribution. California, Montana; certainly more 
widespread, recorded by Frick (1959) from Illinois, 
Indiana, Maryland, and South Dakota, but these 
records require confirmation; Europe. 
Reference.^-*Spencer , 1981: 197. 
Note. Spencer (1969a: 121) confused C. morosa with 
C. magnicornis (see above). In Europe, Nowakowski 
102 
