HELEOMYZID FLIES NORTH OF MEXICO—GILL 569 
when the synonymy of A. armipes (Loew) and A. cineraria (Loew) 
was made, 
Acantholeria abnormalis Garrett 
FIGuRE 62 
Acantholeria abnormalis Garrett, 1921, p. 131.—Czerny, 1924, p. 110. 
The mesonotum of this species usually does not have distinct brown- 
ish spots at the bases of the dorsocentrals. The male hind tibia 
readily distinguishes this species because there is a stumplike knob 
(not a mere swelling) posteroventrally, proximad of the middle, and 
directed slightly toward the distal end of the tibia. The knob is 
about twice as long as wide. The hind femur of the male has a cluster 
of 2 to 6 stout spines on the posteroventral side. The tips of the 
spines are straight. 
Distripution.—Alaska, British Columbia, Wyoming, Montana, 
Colorado; May-July. 
Genus Schroederella Enderlein 
Helomyza Fallén, Meigen, 1830, p. 47 (part).—Zetterstedt, 1847, p. 2430 (part). 
Blepharoptera Macquart, Loew, 1859, p. 57 (part). 
Leria Robineau-Desvoidy, Pandellé, 1901, p. 344.—Aldrich and Darlington, 
1908, p. 77 (part). 
Schroederia Enderlein, 1914, p. 314.—Enderlein, 1917, p. 67—Czerny, 1924, p. 
101. 
Schroederella Enderlein, 1921, p. 231.—Collin, 1943, p. 245. 
A discussion of the characters used to separate Schroederella from 
related genera will be found under Acantholeria Garrett. S. iners 
(Meigen) is the only species recorded from North America to the 
present. Czerny (1924) mentioned that Aldrich and Darlington’s 
description of S. wners (Meigen) agreed with the original description, 
except from the general body coloration. Garrett, too, recognized that 
two forms are present; in his collection he labelled the dark form 
S. wers (Meigen) and described the light form as a new species, 
Amoebaleria (Edioamoeba) luteoala Garrett (Garrett, 1925b, p. 3). 
The two forms of Schroederella differ not only in color, but also in 
the structure of the male terminalia. The latter difference is admit- 
tedly slight, yet distinct. There appear to be no intermediate forms. 
I previously believed that the dark form was restricted to the western 
states and the light form to the eastern states; however, specimens in 
the U.S. National Museum and the Museum of Comparative Zoology 
at Harvard indicate that the ranges of the two forms may overlap. 
These facts prompt me to consider the two forms as distinct species. 
Inasmuch as the original description of S. iners (Meigen) was of the 
light form, the dark form must be described as new. 
