Amauromyza ( Cephalomyza ) sp. 
(Colorado) 
A single caught female from Colorado, 
Clear Creek County, Mt. Evans, 
timberline, 11,700 feet, 22. VII. 61 (B. 
H. Poole), in CNC, clearly represents 
an undescribed species. A brief 
diagnosis is given in the key at 
couplet 9, but the formal description 
is best delayed until a male becomes 
available . 
GENUS CERODONTHA ROND AN I 
Ten new species are described, 3 each 
in the subgenera Poemyza and Dizygomyza 
and 4 in Butomomyza . One new synonym 
is established and two species are 
recorded as new to the United States. 
The status of five species is 
discussed and further clarified. 
Cerodontha ( Xenophy tomyza ) illinoensis 
(Malloch) 
(Figs. 553, 554) 
Agromyza illinoensis Malloch, 1934: 
483. Holotype female (neotype) and 
neallotype male from Illinois in 
INHS. 
Cerodo ntha (Xenophy tomyza) illinoensis, 
Frick, 1952c: 150. 
Cerodontha ( Poemyza ) simcoensis 
Spencer, 1969a: 135. Holotype male 
from Ontario in CNC. NEW SYNONYM. 
Malloch (1934: 483) briefly referred 
to a North American species, Agromyza 
illinoensis Malloch, commenting on its 
black color and adding "the third 
antennal segment is angulate but not 
spinose at the upper apical angle." 
Frick (1952c) accepted this as a valid 
description, giving a detailed 
redescription of the species and 
correctly placing it in the subgenus 
Xenophytomyza . Spencer (1969a) 
overlooked the presence of only a 
single pair of scutellar bristles and 
described Cerodontha ( Poemyza ) 
simcoensis from Ontario, but 
comparison of this with the holotype 
and neallotype of CL illinoensis shows 
the two to be identical, and 
simcoensis is synonymized with C. 
illinoensis here. The male genitalia 
show that among the three European 
species, C). illinoensis is most 
closely related to C. atronitens 
(Hendel, 1920). 
Cerodontha ( Poemyza ) attenuata 
Spencer, new species 
(Figs. 568, 569) 
Head. Frons about 1.5 times width of 
eye, not projecting above eye in 
profile; 2 ors, 2 ori, orbital setulae 
sparse, reclinate; orbit conspicuously 
widening toward midpoint of lunule, 
this high, upper margin at level of 
lower ors; gena narrow, at rear only 
0.1 height of eye; 3d antennal segment 
small, round; arista long, almost 1.5 
times width of eye. 
Mesonotum. 3 postsutural dc, 
presutural apparently lacking, acr in 
about 6 rows, no prsc. 
Wing. Length in male 2.2 mm, C 
extending strongly to M 1+2, last and 
penultimate sections of M 3+4 equal, 
discal cell thus large. 
Color. Frons matt black, orbit 
faintly paler along inner margin; 
lunule grayish; 3d and 1st antennal 
segments black, 2d distinctly 
yellowish; mesonotum largely matt 
black, only weakly shining; pleura 
black, apart from narrow yellow upper 
margin of mesopleuron; legs black, 
apart from knees on all femora, which 
are narrowly yellow; squama, including 
margin and fringe, also wing base, 
yellow; halter white. 
Male genitalia. Aedeagus (fig. 568) 
with distal tubules membranous at end; 
basal and also ventral sclerites fully 
fused (fig. 569); sperm pump with 
large, lightly pigmented blade, wider 
than high; anal projection prominent. 
Host/early stages. Unknown. 
Holotype m. , South Carolina, Oconee 
Co., Mountain Rest, 1,500 ft, 
26. VII. 57; paratype m. , Tennessee, 
Transylvania Co., Looking Glass Rock, 
276 
