Mesonotum. Acr irregularly in 4 rows. 
Wing. Length in male 2.6 mm, 2d 
costal section 2.25 times length of 
4th. 
Color. Frons brownish black, orbit 
darker, blackish; gena brownish black, 
face and antenna black; mesonotum, 
scutellum, and entire side of thorax 
blackish gray; legs black, only 
foreknee indistinctly yellowish; 
squama whitish gray, margin and fringe 
black. 
Male genitalia. Aedeagus (fig. 1292) 
with left basal sclerite short, broad, 
with long ventral extension basally; 
dorsal lobe with main supporting 
sclerites widely divergent and further 
developed lateral sclerite in front 
(fig. 1293); sclerites of ventral 
lobe, broad, ejaculatory duct curving 
dorsally toward supporting sclerites; 
sperm pump (fig. 1294) with long stalk 
and rounded blade. 
Host/early stages. Unknown. 
Holotype m., Colorado, Clear Creek 
Co., Mt. Evans, Doolittle Ranch, 9,800 
ft, 23. VIII. 61 (J. G. Chillcott) , in 
CNC • 
Remarks. The most distinctive 
character of this species is the 
unusually broad frons. The male 
genitalia show that the species cannot 
be closely associated with any others 
in the genus, in particular the 
strongly developed lateral sclerites 
of the dorsal lobe, the characteristic 
shape of the left basal sclerite, and 
the large, long-stalked sperm pump are 
all significant distinguishing 
characters . 
It is a pleasure to name this species 
after Mr. Doolittle, around whose 
ranch many interesting species were 
collected . 
Chromatomyia erigerontophaga (Spencer) 
(new to U.S . A. ) 
(Figs. 1271-1274) 
1969a: 239. Holotype male from 
Greenland in UZMC. 
Chromatomyia erigerontophaga , 
Griffiths, 1976b: 261. 
This small black species is known as a 
leaf miner on Erigeron compos itus , E. 
eriocephalus , and E. humi 1 i s , and it 
is widespread in the Arctic from 
northern Greenland to Alaska. 
Griffiths (1976b: 263) recorded leaf 
mines on E. [ acris L. , var.J debilis 
in the Rockies in Alberta but does not 
positively refer them to C. erigeronto- 
phaga . 
The species can now be recorded from 
Colorado, and this extension of its 
range suggests that there is little 
reasonable doubt about the identity of 
the population in Alberta. 
erigerontophaga is distinctive in 
having the third antennal segment 
enlarged and angulate (fig. 1271) and 
the second costal section unusually 
short, little longer than the fourth. 
The exceptionally long basal sclerites 
of the aedeagus (figs. 1272, 1273) and 
the heavily pigmented sperm pump (fig. 
1274), with the blade little more than 
linear, also indicate the isolated 
position of the species. 
New records. 
Colorado, Clear Creek Co., Mt. Evans, 
Timberline, 11,700 ft, 1 m. , 1 f., 
29. VII. 61 (C. H. Mann); Mt. Evans, 
14,000 ft, 1 f., 25. VII. 61 (J. G. 
Chillcott); Boulder Co., Hoosier 
Pass, 12,000 ft, 1 f., 8. VIII. 61 (B. 
H. Poole); all in CNC. 
Chroma tonry ia flavida Spencer, new 
species 
(Figs. 1245, 1246) 
Head. Frons broad, slightly more than 
twice width of eye, narrowly projecting 
above eye; normal arrangement of 
orbital bristles with upper ors 
shorter than lower (only single ors on 
one side in only available specimen), 
1 ors, orbital setulae sparse, in 
single row; gena extended at rear, 0.5 
height of eye, parafacial prominent; 
3d antennal segment small, round, with 
fringe of weak pubescence. 
Phytomyza erigerontophaga Spencer, 
325 
