53 
sides of face bare except for the row of macrochaetae, cheeks 
two-fifths as wide as the eye-height; thorax thinly gray polli- 
nose, marked with four black vittaej scutellum bearing three 
pairs of long marginal macrochaetae; abdomen subshining, bases 
of last three segments lightly whitish pollinose, first segment 
bearing a marginal pair, second with a discal and a marginal 
pair of macrochaetae, third with a discal pair and a marginal 
row, fourth wholly covered except the extreme base; wings 
tinged with brown along the veins; calypteres yellowish white; 
length, 7 mm. Fort Wrangel, Alaska. A single female speci- 
men collected by H. F. Wickham. Type Xo. 3531, IT. S. 
National Museum spinosa n. sp. 
Sides of face each bearing only one or two macrochaetae, situ- 
ated near lower end of eyes; black, the antennae, palpi, tip of 
scutellum and fourth segment of abdomen yellow; front in both 
sexes one and two-thirds times as wide as either eye, the sides 
and face yellowish pollinose, two pairs of orbital bristles, frontals 
descending to base of third an tennal joint, sides of face covered 
with black bristly hairs, cheeks three-fourths as broad as the 
eye-height, antennae three-fourths as long as face, the third joint 
six times as long as the second, arista thickened on the basal 
third or half; thorax gray pollinose, marked with three black 
vittae, scutellum bearing three long marginal pairs and a short 
apical pair of macroclnetae ; abdomen thinly gray pollinose, 
subshining, last three segments bearing discal macrochaetae; 
wings subhyaline, veins faintly clouded with brown ; length, to 
7 mm. Opelousas, La. Three males and one female collected 
in March, 1897, by Mr. G. R. Pilate .setigena n. sp. 
Genus ADMONTIA Br. and Berg. 
Admontia Brauer and Bergenstarnm, Zweif. Kais. Mns. Wien, IV, p. 104; 1889. 
On page 410 of Part V of the above-mentioned work, a species from 
"X. Amer.'Ms listed as u Admontia americana n., w but no description 
of it has to my knowledge been published. Our four species have only 
three postsutural niacroclueta- : 
1. Wings wholly hyaline, or slightly smoky costally, usually three 
sternopleural macrochaetae 2. 
Wings whitish hyaline to small crossvein, the remainder brown 
except the hind margin, which is hyaline; onty two sternopleu- 
ral macrocluetoe, palpi yellow, legs black, arista thickened to 
beyond the middle, cheeks one-half as broad as the eye height; 
length, 7 mm. Northern Illinois. ( Journ. N. Y. Ent. Soc, Vol. 
Ill, p. 55 ; June, 1895.) nasoni Coq. 
2. Legs black, two pairs of orbital bristles in both sexes 3. 
Legs and palpi yellow, no orbital bristles in the male, arista thick- 
ened on less than the basal third, cheeks one-third as broad as 
