HELEOMYZID FLIES NORTH OF MEXICO—GILL 535 
DistRiBUTION.—Washington, California, New Mexico, Wyoming; 
April—July. 
Pseudoleria longigena Garrett 
FiaureE 31 
Pseudoleria longigena Garrett, 1925b, p. 2. 
This species is very similar to the preceding one. The above 
description will thus apply very well here, except as follows: cheek-eye 
ratio from 0.60 to 0.75; wings with anterior crossvein faintly darkened 
with brown; length 4.0-5.0 mm.; male terminalia with epandrium 
extended posteroventrally into a narrow rounded protrusion. 
Disrrinution.—Oregon, California, Arizona; March—November. 
Pseudoleria crassata Garrett 
FIGureE 33 
Pseudoleria crassata Garrett, 1925b, p. 3. 
Examination of the male terminalia of a large number of specimens 
of Pseudoleria showed that several distinct forms occur. When I 
subsequently examined the types of Garrett’s species, it was possible 
to match most of his species with the forms I had previously recog- 
nized and identified with numbers. However, one group of species 
has proved particularly difficult to interpret; these species are P. 
crassata Garrett, P. intermedia Garrett, P. media Garrett, and P. 
duhna Garrett. The terminalia appear to be quite similar in all these, 
and I cannot apply the wing and tarsal characters given in Garrett’s 
key. The differences in length of the tarsal segments appear to be so 
slight that they could be due to artifacts related to the drying of the 
specimens. 
I have recognized the existence of three forms which seem to belong 
in the aforementioned group of species. I have matched the termi- 
nalia of one of these forms with P. crassata Garrett, on the basis of a 
type and two paratypes which I examined. 
MALE AND FEMALE.—Front yellow to yellowish brown, darker 
toward the vertex; upper back of head grayish, base of antennae 
yellow to reddish orange, third antennal segment often becoming 
brownish, arista brown; oral vibrissae strong, buccal setae in 2 or 3 
irregular rows; cheek-eye ratio from 0.45 to 0.60. 
Thorax yellowish brown, with grayish pollinosity, especially on 
mesonotum; mesonotum sometimes with a thin median vitta and 
brown spots at bases of dorsocentrals; pteropleuron with several hairs, 
usually 1 stronger bristle standing out from among the neighboring 
hairs; legs yellow or brownish yellow; wings hyaline, anterior cross- 
vein very slightly darkened; abdomen yellowish brown to dark gray 
