HELEOMYZID FLIES NORTH OF MEXICO—GILL 515 
deflected slightly forward at the tip; subcosta joins costa at level of 
anterior crossvein. 
Abdomen brownish, hypopygium yellow brown. 
FrmMaLe.—Similar to male, except that conspicuous ‘‘beard’’ is 
lacking; forefemora and tarsal segments normal, no curved claw 
present on the basitarsus. 
Lrenctu.—4.0-6.0 mm. 
DistRIBUTION.—British Columbia, Washington; October-Novem- 
ber. There is a female in the U.S. National Museum determined by 
Aldrich as this species. It was collected in Maryland in November. 
In view of the difficulties in determining female specimens, I would 
consider this determination questionable, although the palpi of the 
specimen are yellow as in O. barbata (Garrett). 
Genus Heteromyza Fallén 
Heteromyza Fallén, 1820, p. 1—Meigen, 1830, p. 45 (part)—Macquart, 1835, 
p. 415 (part).—Zetterstedt, 1847, p. 2461 (part).—Pandellé, 1901, p. 342 
(part).—Collin, 1901, p. 106 (part); 1943, p. 241.—Czerny, 1924, p. 74; 
1927a, p. 24 
Lentiphora Robineau-Desvoidy, 1830, p. 656. 
Tephrochlamys Loew, 1859, p. 72 (part). 
Thelida Robineau-Desvoidy, Pandellé, 1901, p. 343 (part). 
A single species of Heteromyza has been recorded from North 
America. I have seen only two males and two females of this species. 
The following description is based on these specimens. 
Heteromyza oculata Falilén 
Heteromyza oculata Fallén, 1830, p. 2.—Meigen, 1830, p. 46.—Macquart, 1835, 
p- 415.—Zetterstedt, 1847, p. 2463.—Collin, 1901, p. 111.—Czerny, 1924, 
p. 75; 1927a, p. 24. 
Thelida oculata (Fallén), Pandellé, 1901, p. 344. 
Lentiphora flaveola Robineau-Desvoidy, 1830, p. 656. 
Heteromyza scutellata Macquart, 1835, p. 415. 
Heteromyza eriphides Walker, 1849, p. 1088. 
Heteromyza flavipes Walker, 1849, p. 1089. 
Tephrochlamys magnicornis Loew, 1859, p. 73; 1862b, p. 128—Meade, 1899, 
p. 101. 
Mate.—Front brownish yellow, darker brown toward the vertex; 
fronto-orbital area, vertex, and ocellar triangle with a grayish pol- 
linosity; back of head ash gray, becoming yellow near the ventral 
margin; face, cheeks, and palpi yellowish orange; antennae yellowish 
orange to brown; aristae dark brown, minutely pubescent; third an- 
tennal segment slightly oval; 2 pairs of weakened fronto-orbital 
bristles; oral vibrissae strong; a single row of buccal setae; cheek-eye 
ratio from 0.18 to 0.2; eyes large, separated by only the width of the 
ocellar triangle at the vertex and upper half of front. 
