Cerodontha ( Butomomyza ) impolita 
Spencer, new species 
(Figs. 579, 580) 
Head. Frons broad, almost twice width 
of eye, not projecting above eye in 
profile but finely setulose above 
lunule; 2 ors, 2 ori, orbital setulae 
sparse, reclinate; orbit not signifi- 
cantly widening anteriorly; gena 
broad, extended at rear, there almost 
0.25 height of eye; 3d antennal 
segment rounded , longer than broad , 
with only short pubescence, arista 
appearing bare. 
Mesonotum. 3+1 strong dc , presutural 
only slightly shorter than 3d, acr 
sparse, in only 4 rows, prsc weak, 
shorter than presutural dc. 
Wing. Length in male 2.1 ram, C ex- 
tending to M 1+2, last and penultimate 
sections of M 3+4 equal, inner cross- 
vein at midpoint of discal cell. 
Color. Frons, orbit, and antenna 
black; mesonotum matt gray; pleura 
black, with only upper margin of 
mesopleuron yellow; legs largely 
black, only foreknee narrowly yellow; 
squama, fringe, and wing base bright 
yellow. 
Male genitalia. Aedeagus (fig. 579) 
S-shaped, distal tubules short, only 
slightly diverging; sperm pump with 
thick stalk, blade only slightly 
widening (fig. 580). 
Host/early stages. Unknown. 
Holotype m. , Colorado, Boulder Co., 
Longmont, 5,000 ft, 3. VI. 61 (B. H. 
Poole); paratype m. , North Carolina, 
Yancey Co., Mills Creek, 2,100 ft, 
14. VIII. 57 (J. G. Chillcott ) ; both in 
CNC. 
Remarks. The relatively broad gena, 
bare arista, and matt gray mesonotum 
are distinctive characters of this 
species. The S-shaped distiphallus 
(fig. 579) is significantly different 
from that of the species it most close- 
ly resembles, £. impercepta (fig. 581). 
Cerodontha ( Butomomyza ) parvella 
Spencer, new species 
(Fig. 574) 
Head. Frons broad, twice width of 
eye, distinctly projecting above eye 
in area of ori (see fig. 572); 2 ors, 
2 ori, orbital setulae sparse, recli- 
nate; lunule broad, higher than a 
semicircle, characteristic of subgenus 
(fig. 540, B ) ; gena extended at rear, 
about 0.25 height of eye; 3d antennal 
segment small, longer than broad, 
rounded below, obtusely angulate 
at upper corner, arista appearing 
bare, short, swollen at base. 
Mesonotum. 3+1 strong dc, presutural 
equal to 3d, acr irregularly in 4 
rows, prsc well developed. 
Wing. Length in male 2 mm, C 
extending strongly to M 1+2, last and 
penultimate sections of M 3+4 equal, 
inner crossvein at midpoint of discal 
cell . 
Color. Frons, orbit, and antenna 
black; mesonotum almost entirely matt, 
gray; pleura grayish black, mesopleuron 
only narrowly yellow along upper 
margin; legs entirely black; squama 
and fringe yellow. 
Male genitalia. Aedeagus (fig. 574) 
with paired distal tubules short, not 
diverging; sperm pump with broad stalk 
and blade but greatly widening, heavily 
pigmented; surstylus with 2 or more 
short bristles on inner corner. 
Host/early stages. Unknown. 
Holotype m. , Colorado, Clear Creek 
Co., Mt. Evans, Echo Lake, 10,600 ft, 
20. VII. 61 (B. H. Poole), in CNC. 
Remarks. This species is distinguish- 
able by the small size, projecting 
frons, and gray mesonotum. The short 
distiphallus (fig. 574) is also 
distinctive . 
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