profile; 2 ors, 2 ori, orbital setulae 
well developed, reclinate; lunule 
extending to level of upper ori; gena 
narrow but slightly extended at rear, 
0.1 height of eye; 3d antennal segment 
small, round, slightly pubescent, 
arista long, little shorter than 
height of eye. 
Mesonotum. 3+1 strong dc, prsc well 
developed, acr irregularly in 5 rows. 
Wing. Length in male 2.3 mm, last 
section of M 3+4 slightly shorter than 
penultimate, in ratio 6:7, inner 
crossvein at midpoint of discal cell. 
Color. Head black but lunule gray; 
mesonotum grayish black, weakly 
shining; pleura black, only hindcorner 
of mesopleuron yellow; legs black 
apart from yellow knee on foreleg; 
squama yellowish gray, margin and 
fringe deep black. 
Male genitalia. Aedeagus (fig. 577) 
with distal tubules vertical to 
mesophallus, only slightly widening 
and curving at apex; sperm pump large, 
fanlike; epandrium (fig. 578) with 
conspicuously strong group of bristles 
at hindcorner and very long hairs 
along outer margin. 
Host/early stages. Unknown. 
Holotype m. , North Carolina, Transyl- 
vania Co., Looking Glass Rock, near 
Pisgah Forest, 2,500 ft, 30. VII. 57 (J. 
G. Chillcott) , in CNC. 
Remarks. This species is distinguish- 
able from C. angulata by the dark 
squamal fringe, and both aedeagus and 
epandrium (see figs. 583, 584) are 
also distinctively different. It may 
be reliably distinguishable from C. 
scirpi only by the genitalia. 
Cerodontha ( Butomomyza ) impercepta 
Spencer, new species 
(Figs. 581, 582) 
Head. Frons broad, twice width of 
eye, not projecting above eye in 
profile; 2 ors, 2 ori, orbital setulae 
sparse, reclinate; orbit pronounced, 
conspicuously widening toward base of 
antennae; lunule narrow but high, 
upper margin at level of upper ori; 
gena extended at rear, 0.17 height of 
eye; 3d antennal segment small, round, 
without noticeable pubescence, arista 
distinctly pubescent. 
Mesonotum. 3+1 dc, presutural shorter 
than 3d, acr in some 6 rows, prsc 
strong, equal to 3d dc. 
Wing. Length in male 2.3 mm, C extend- 
ing to M 1+2, last section of M 3+4 
slightly longer than penultimate, inner 
crossvein slightly beyond center of 
discal cell. 
Color. Frons and orbit black, 3d 
antennal segment black, 2d slightly 
paler, faintly yellowish; mesonotum 
grayish black, only weakly shining; 
pleura black, only upper margin of 
mesopleuron narrowly yellow; legs with 
femora black but knees bright yellow 
on foreleg and midleg, scarcely paler 
on hindleg, tibiae brownish, tarsi 
yellowish; wing with R veins dark, M 
veins pale, M 3+4 almost colorless; 
squama, fringe, and wing base bright 
yellow. 
Male genitalia. Aedeagus as in 
figures 581, 582, distal tubules pale 
at end, only slightly diverging; sperm 
pump elongate, with narrow stalk and 
blade not greatly widening. 
Host/early stages. Unknown. 
Holotype m. , North Carolina, Macon 
Co., Highlands, 3. VI. 57 (J. R. 
Vockeroth), in CNC. 
Remarks. Although generally 
resembling other species with the 
squamal fringe pale, C. (B. ) 
impercepta is clearly distinguishable 
by the flat curve of the distiphallus 
(fig. 581). Positive identification 
may only be possible from the male 
genitalia. 
280 
