HELEOMYZID FLIES NORTH OF MEXICO—GILL 509 
Allophyla laevis Loew 
Figure 13 
Allophyla laevis Loew, 1862a, p. 225 (Centuria 2, 85).—Aldrich and Darlington, 
1908, p. 98.—Czerny, 1924, p. 64. 
Matr.—Entire head yellowish orange, darker toward the vertex 
and lighter toward the cheeks; a single fronto-orbital bristle; fronto- 
orbital plates oblique; vibrissae weak; 2 or 3 irregular rows of buccal 
setae; antennae yellowish orange, except for dark brown aristae; third 
antennal segment sometimes shading to brown; aristae long pubescent; 
cheek-eye ratio about 0.33. 
Thorax uniformly yellowish orange; strong humeral bristle; dorso- 
central bristles 1+4; no prescutellar bristles; scutellum bare except 
for 2 pairs of lateral bristles; pleura without bristles or setae, except 
sternopleuron, which has one strong bristle in upper hind corner 
(just caudad of middle of upper margin) and 1 or 2 rows of setae down 
the middle to the longer hairs between the coxae. 
Legs yellowish orange, a little darker distally; hind femur with 3 
or more bristles distally on anterodorsal side. 
Wings hyaline; first vein ends at or slightly before the level of the 
anterior crossvein; sixth vein fades out before reaching the wing 
margin. 
Abdomen yellowish brown to dark brown; scattered setae; segments 
2-5 each with a row of bristles on the posterior margin. 
FEMALE.—Similar to male except for terminalia; bristles of abdomen 
not so well developed. 
Lrenetu.—4.0-5.0 mm. 
Distrinpution.—British Columbia to Nova Scotia, south to Cali- 
fornia and Georgia; May—October. 
RemMArRKS.—I have examined the male and female syntypes (Type 
13192) in the Museum of Comparative Zoology, Harvard University. 
They agree with the above description. 
Allophyla atricornis (Meigen) 
Helomyza atricornis Meigen, 1830, p. 54.—Zetterstedt, 1847, p. 2437.—Schiner, 
1864, p. 27.—Pandellé, 1901, p. 342. 
Allophyla atricornis (Meigen), Loew, 1859, p. 43.—Meade, 1899, p. 100.—Czerny, 
1904, p. 284; 1924, p. 63; 1927a, p. 21.—Collin, 19438, p. 240. 
This species is apparently distinguishable from Allophyla laevms 
Loew only by the presence of black antennae. Although A. laevis 
Loew sometimes has the third antennal segment partially brown, I 
have seen only one specimen with the antennae wholly brownish 
black. This specimen is a female (in USNM) collected at Anchorage, 
