Cerodontha , Subgenus Phytagromyza 
Hendel 
Phytagromyza Hendel, 1920: 145. Type 
of subgenus: Agromyza ( Domomyza ) 
f lavocingulata Strobl, 1909 (Europe). 
All but the type-species of Phytagro - 
myza are now included in the genus 
Paraphytomyza Enderlein (p. 162). How- 
ever, the type-species, f lavocingulata , 
correctly belongs in the genus Cerodon- 
tha * Only two species are known in 
the subgenus, f lavocingulata , which 
occurs in Europe and Canada, and 
frankensis Spencer, described from 
Canada and now known from California 
and Wyoming. These two species are 
distinguishable by the costa ending at 
vein R 4+5 and are readily separable 
because the squamal fringe is dark in 
C. frankensis and yellow in C. flavo- 
cingulata . ~ 
Cerodontha ( Phytagromyza ) frankensis 
Spencer 
(Fig. 571) 
Synopsis. Frons not projecting above 
eye, 2 ors, 3 ori; lunule narrow, 
slightly higher than a semicircle; 3d 
antennaj. segment small, round; 
mesonotum with 3+1 dc , prsc weak; wing 
length 2. 1-2.6 mm, costa ending at 
vein R 4+5, last section of M 3+4 less 
than 3 times penultimate, inner 
crossvein slightly before midpoint of 
discal cell; frons ochreous yellow 
behind, blackish in front, orbit and 
all antennal segments black; mesonotum 
black, faintly tinged with gray, only 
weakly shining; pleura black, only 
upper margin of mesopleuron narrowly 
bright yellow; femora black, all knees 
yellow; squama yellow, margin and 
fringe brown, wing base bright yellow; 
male genitalia with aedeagus (fig. 
571) having paired tubules of 
distiphallus parallel, not diverging 
but slightly dilated at apex. 
Host /Early Stages. Unknown, almost 
certainly Poaceae. 
Distribution. Widespread in Cali- 
fornia; new record: Wyoming, Carbon 
Co., Battle Lake Road, Sierra Madre 
Range, 8,000 ft, 1 m. , 18. VII. 61 
"on side of stream" (j. G. Chillcott, 
CNC); Canada. 
References. Spencer, 1969a: 119; 
1981: 191. 
Cerodontha , Subgenus Butomomyza 
Nowakowski 
Cerodontha ( Bu t omomy z a ) Nowakowski, 
1967: 633. Type of subgenus: 
Agromyza angulata Loew, 1869 
(Europe) . 
The most significant character 
separating this subgenus from Poemyza 
is the broader, higher lunule (fig. 
540, jO. At the hindcorner of the 
epandrium there is normally a con- 
spicuous patch of bristles (figs. 578, 
584), never present in Poemyza . The 
third antennal segment is never 
enlarged in the male as is frequently 
found in Dizygomyza (fig. 593). 
The larvae normally feed on Cyperaceae, 
particularly Carex , but a few species 
in Europe have been found on Poaceae. 
Of the eight species now recorded in 
the United States, the host is known 
of two (in Europe), but none have been 
recorded here. With further col- 
lecting, the characteristic yellowish 
green leaf mines will certainly be 
found on many species of Carex . In 
most species the puparium remains in 
the mine. 
Butomomyza is a small subgenus, 
occurring mainly in Europe and North 
America, but a single species has been 
described in Australia (Spencer, 
1977d). Eleven species have been 
recorded in Europe (Nowakowski, 
1973). Four new species are described 
here . 
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