46 
0. Thorax destitute of a large spot of yellowish pollen in front of the 
scuiellnm 7. 
Thorax bearing a large spot of yellowish pollen, elsewhere sub- 
opaque, the sides and suture gray polliuose; abdomen shining 
bluish black, the margin sometimes yellow, on the fourth seg- 
ment grayish i>ollinose; wings hyaline, brownish eostally except 
at base, the brown color extending to middle of discal cell, some- 
times forming a border to the fifth vein and the hind crossvein, 
and containing hyaline spaces; length, to 7 mm. White Moun- 
tains and Franconia, X. II. (Annales Soc. Entomol. France, 
p. 255; 1888. Hyalomyia sp.. Brauer and Bergenstamio in 
lift.) ... .fenestrate Bigot. 
7. Wings destitute ef a distinct hyaline spot beyond tip of first vein . 8. 
Wings marked with such a spot reaching from near the costa to 
middle of first posterior cell, elsewhere brown, with hyaline 
spaces and hind margin; costa excessively arcuate, first poste- 
rior cell over half as wide as long; black, the palpi yellow, abdo- 
men shining brassy black, thinly whitish polliuose, thorax, when 
viewed from behind, subopaque, thinly whitish polliuose, two 
subdorsal vitta*, the front end, and behind the suture black; 
calyptercs white; frontal vitta at narrowest part two thirds as 
wide as distance between the posterior ocelli; length, 8 mm. 
Franconia, N. II. A male specimen, collected by Mrs. A. T. Slos- 
son. Type No. 3523, (J. S. National Museum, .phasioides n. sp. 
8. Abdomen more or less shining 10. 
Abdomen opaque, yellowish gray polliuose 9. 
9. Veins on front and hind edges of discal cell bordered with brown; 
black, the palpi yellow; thorax, when viewed from behind, thinly 
whitish polliuose, the front end, behind the suture, andtwosub- 
dorsal vitta- black: frontal vitta at narrowest part half as wide 
as distance between the posterior ocelli; calyptercs whitish; 
wings biown, the base yellowish, the hind margin and centers 
of discal and fust posterior cells usually hyaline, costa rather 
strongly arcuate; length, 4..~ to 6 mm. Clemen ton, N. J. (May 
10 and 26, 181)0), and Potomac Greek, Ya. (May 23, 1890). Six 
male specimens, collected by O. W. Johnson. Type No. 3524, 
T. S. National Museum fumosa n. sp. 
Veins on front and hind edges of discal cell not bordered with 
brown, wings whitish hyaline, the base to beyond the humeral 
crossvein yellowish, costal margin beyond this to slightly below 
apex of third vein, last two sections of third vein, and fourth vein 
beyond the bend bordered with smoky brown, costa excessively 
arcuated; length, 7 mm.; otherwise as in the above descrip- 
tion of fumosa. Grimsby, Canada. A single male specimen, 
collected October 7, 1894. Type No. 3525, CJ. S. National 
Museum pulverea, n. sp. 
