HELEOMYZID FLIES NORTH OF MEXICO—GILL 533 
the surstylus. In Z. distincta Garrett, the distal hypandrium is at 
least half the width of the surstylus. 
Distrisnution.—Aweme, Manitoba; October-November. 
Genus Pseudoleria Garrett 
Leria Robineau-Desvoidy, Aldrich and Darlington, 1908, p. 77 (part). 
Pseudoleria Garrett, 1921, p. 128.—Czerny, 1924, p. 100; 1930, p. 443.— 
Garrett, 1925b, p. 1 
The presence of hairs or bristles on the pteropleuron will distinguish 
this genus from closely related genera. For the most part, the 
species within this genus are very much alike and can be determined 
with certainty only by examining the structure of the male terminalia. 
Although I have presented below a key to the known species, the 
illustrations of certain structures of the terminalia will perhaps be 
more useful than the key. 
Members of this genus are characterized as follows: anterior 
fronto-orbital bristle very weak, often indistinguishable from the 
frontal setae; posterior fronto-orbital bristle strong; dorsocentral 
bristles 1+-3; scutellum with 2 pairs of lateral bristles, otherwise bare 
(rare exceptions are known); propleural bristle present; mesopleuron 
bare except for occasional setae in anterior corner; pteropleuron with 
several hairs or bristles; steropleuron with a single bristle in upper hind 
corner and scattered setae extending down to the longer hairs between 
the coxae; prosternal bristles absent; middle tibia with a dorsal 
preapical bristle and several ventral apical bristles; fore and hind 
basitarsi of male with a small clawlike protrusion distally on ventral 
side; wings hyaline, sometimes with faint brownish tinge, but no 
shone: infuscations; anterior crossvein sometimes slightly darkened. 
Key to the Species of Pseudoleria (Males only) 
1.. Cheek-eye ratio usually greater than 0.60..........4.2... 2 
Cheek-eye ratio usually less than 0.60... . . 23 
2. Epandrium extended posteroventrally into a narrow roudded nTOeRUSiGE 
longigena Garrett 
Epandrium becoming wider posteroventrally, but not extended into a narrow 
rounded protrusion. . . .. . . . longigenoidea, new species 
3. Hind basitarsus thickened al cones than the following segment. 
parvitarsus Garrett 
Hind basitarsus no shorter than the following segment. . ....... 4 
4. Epandrium, when viewed laterally, with 2 distinct knoblike protrusions. 
pectinata (Loew) 
Epandrium, when viewed oat without 2 distinct knoblike protru- 
SIONS). sy sb ee eaCnecr tke) 
5. Hypandrium with 2 Sra place spines; eropandrinn eaened Tales ventrally 
and with a notch in middle of apical margin, so that short anterior and 
posterior projections are formed ....... .. . .. robusta Garrett 
