Among nearctic species, (L magnicornis 
is recognizable by the yellow noto- 
pleuron. The holotype has been re- 
examined, and it is noted that the 
third antennal segment is missing on 
both sides, but the aedeagus is 
extruded and its identity is not in 
doubt. A new illustration of the 
aedeagus is given in figure 595. The 
species is not common and two new 
records are given here. 
Cerodontha ( Dizygomyza ) poolei Spencer, 
new species 
(Figs. 603, 604) 
Head (fig. 603). Frons conspicuously 
projecting above eye below lower ors, 
exceptionally broad, 4 times width of 
eye; orbit broad, distinctly widening 
toward lunule; 2 ors, 3 ori (occasion- 
ally 4), orbital setulae sparse, some- 
what irregular but predominantly 
reclinate; lunule semicircular; gena 
broad, extended at rear, 0.25 height 
of eye; 3d antennal segment enlarged 
in male, only finely pubescent, more 
elongate in female, arista fine, bare 
in upper half, conspicuously widening 
below. 
Mesonotum. 3+1 strong dc, presutural 
little weaker than 3d, acr sparse, in 
approx. 4 rows, but coarse, particu- 
larly in presutural area, prsc 
undeveloped . 
Wing. Length from 3.2 ram in male to 
3.4 mm in female, last section of 
M 3+4 shorter than penultimate, in 
ratio 6:7, inner crossvein slightly 
oblique, just beyond center of discal 
cell. 
Color. Frons brownish, normally dark, 
occasionally paler; orbit and antenna 
black; mesonotum matt blackish, only 
slightly grayish; pleura black, only 
mesopleuron narrowly yellow on upper 
margin; legs almost entirely black, 
only foreknee narrowly yellow; abdomen 
shining black, with all tergites 
narrowly yellow bordered; squama and 
fringe yellow. 
Male genitalia. Aedeagus (fig. 604) 
with distinctive curvature. 
Host/early stages. Unknown. 
Holotype m. , Colorado, Clear Creek 
Co., Mt. Evans, 12,000 ft, 3. VIII. 61 
(B. H. Poole); paratypes 1 f., same 
data; Mt. Evans, Timber line, 11,700 
ft, 3 m., 2 f., 22. VII. 61 (B. H. 
Poole); Boulder Co., Hoosier Pass, 
12,000 ft, 1 m., 8. VIII. 61 (C. H. 
Mann). Holotype and paratypes in CNC, 
2 paratypes in KAS. 
Remarks. The unusually broad frons and 
large size make this a distinctive 
species . 
GENUS LIRIOMYZA MIK 
Eleven new species are described, 3 
new synonyms are established, and 5 
species are recorded as new to the 
United States and 1 as new to North 
America. One probable new species 
from Colorado is briefly diagnosed but 
not formally described in the absence 
of males. Eight other species are 
discussed. The full synonymy is given 
of L. sativae in view of its economic 
importance and the confusion caused in 
the past by the eight names that have 
been used for populations reared from 
different hosts at different 
localities . 
Liri omyza allia (Frost) 
(Figs. 843, 844) 
Agromyza allia Frost, 1943: 257. Holo- 
type male from Kansas in USNM. 
Liriomyza allia , Frick, 1955: 90. 
Following a heavy infestation of 
onions in Iowa in 1932, Frost 
described L. allia , surprisingly 
selecting as holotype a caught male 
from Kansas and including 27 as para- 
types, of which 20 had been reared 
from onion. Frick (1955) noted that 
the holotype of L. allia was not 
identical with the onion leaf miner, 
which he described as a new species, 
L. allivora . The latter has proved to 
284 
