antennal segment at most slightly 
angulate . 
Cerodontha ( Xenophytomyza ) illinoensis 
(Malloch) 
This is the only species known from 
the United States. 
Synopsis. Frons not noticeably 
projecting above eye (in holotype and 
neoallotype examined); orbit pro- 
nounced, with 2 ors and 2 ori, not 
greatly widening anteriorly; lunule 
small, narrow, upper margin near level 
of lower ors; 3d antennal segment 
(fig. 553) distinctly angulate at 
upper corner; mesonotum with normally 
3+1 slender dc but 3d and 4th not 
infrequently weak; prsc lacking; wing 
length from 2 to 2.5 mm, costa 
extending strongly to vein M 1+2, last 
section of M 3+4 from 1.5 to just less 
than twice as long as penultimate; 
male genitalia with aedeagus (fig. 
554) having long, fused, distal 
tubules, enlarged and bending 
ventrally at end. 
Host/Early Stages. Unconfirmed, 
almost certainly Poaceae; larva mining 
in leaf sheath. 
Distribution. Illinois; new record: 
Tennessee, Hamilton Co., East Ridge, 
2 m., 5.V.52 (G. Peck, CNC); Canada. 
References. Frick, 1952c: 150; 
Spencer, 1969a: 135 (as C.. ( Poemyza ) 
simcoensis ) ; part 2, p. 276. 
Cerodontha , Subgenus Poemyza Hendel 
Dizygomyza ( Poemyza ) Hendel, 1931: 35. 
Type of subgenus : Agromyza pygmaea 
Meigen, 1830 (Europe). 
Essential characters of this subgenus 
are the high, narrow lunule (fig. 540, 
A) and the prominent orbit. A number 
of species previously included in 
Poemyza are now placed in the subgenus 
Butomomyza , following Nowakowski's 
(1973) detailed revision of the 
genus. Two such North American 
species are Cerodontha (B. ) angulata 
and £. (13. ) subangulata . 
The majority of species in Poemyza 
are leaf miners on Poaceae, but one 
new species described here was found 
on Carex . The host is known of 6 of 
the 10 recorded United States species, 
and of these, only 5 — C. ( P. ) incisa , 
inconspicua , macminni , muscina , and 
superciliosa — have been actually reared 
in the United States. Pupation normal- 
ly occurs within the mine, and several 
larvae frequently feed together. No 
less than 16 puparia of _C. (P. ) 
macminni were found in a single leaf 
of Carex (part 2, p. 278). 
The subgenus is widely distributed, 
with 234 species known in Europe. It 
is present in Sri Lanka (Spencer, 
1975) and New Guinea (Spencer, 1977b) 
but has not reached Australia. It is 
also absent from the Neotropical 
Region. Three new species are 
described here and one, C. (P. ) 
pygmaea , is recorded as new to the 
United States. 
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