Fifteen species are now known in 
Icteromyza , of which 5 are in the 
United States. This subgenus is 
widely distributed, occurring in 
Australia, Europe, New Guinea, New 
Zealand, South Africa, and Sri Lanka. 
A new species was recently described 
from the high mountains of Mexico 
(Spencer, 1977c) and two others from 
California. One species, C. (I.) 
fuscifrons Spencer, 1969a ,~was~ 
described from northern Quebec and may 
possibly also be present at high 
elevations in the United States. C. 
) pollinosa Melander, 1913, was 
described from Alaska and has also 
been recorded from northern Canada 
(Spencer, 1969a). 
Key to Cerodontha , 
Subgenus Ic teromyza 
Species 
1. Palpus black 2 
— Palpus yellow 3 
2 (1). Large species, wing length 2. 7-3.5 mm; 5 or more 
orbital bristles C. I. capitata (Zetterstedt) 
Synopsis. Frons yellowish orange, sometimes with 
slight grayish patches, orbit darkened in upper 
half, normally with 2 ors and 3 ori but in largest 
females up to 11 bristles can occur; lunule large, 
higher than a semicircle, yellow; 3 d antennal seg- 
ment black, 1 st and 2 d slightly yellowish; mesonotum 
matt, grayish black; legs black but all knees con- 
trastingly yellow for femoral width; squama yellow, 
margin and fringe brownish black; wing length up to 
3.5 mm; male genitalia with aedeagus (fig. 541) 
having end of distiphallus divided by membranous 
connection from curved section below. 
Host/Early Stages. Almost certainly Juncus spp. 
But no larvae have been found, despite intensive 
searching in Europe. 
Distribution. Widespread, occurring in many States 
(Frick, 1959); common in California; new records: 
Colorado, Mississippi, North Carolina, Wyoming. 
References. Frick, 1959; Spencer, 1969a: 138; 1981: 
167. 
Smaller species, wing length 2. 5-2 . 6 mm; 2 ors, 2 ori 
(rarely 3) C. ( I . ) montanoides Spencer 
Synopsis. Frons and orbit uniformly matt black, 
lunule, gena, and face yellow; 1 st and 2 d antennal 
segments yellow, 3d black; palpus black; legs large- 
ly black, only foreknees distinctly yellow, on mid- 
leg and hindleg only indistinctly paler; squama 
gray, margin and fringe black; male genitalia with 
aedeagus (figs. 542, 543) having distal tubules 
curving dorsal ly, diverging. 
Host/Early Stages. Unknown. 
Distribution. California. 
Reference. Spencer, 1981: 171. 
3 (1). Forefemur yellow on distal 3d 
7 C. (I.) longipennis (Loew) 
Synopsis. Frons largely yellow, upper orbit blackish, 
eye largely bare, at most with scattered hairs; 3 d 
antennal segment round, slightly enlarged, varying 
from yellowish brown to black; palpus yellow; meso- 
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