128 
silvery, including the vitta, in the female grayish pollinose, the vitta 
brownish; orbital bristles present in both sexes; three postsutural and 
two stemopleural macrochieta?, thorax of male grayish pollinose except 
on the front end, not vittate, that of the female gray pollinose and 
marked with four black vittae; abdomen gray pollinose, last three seg- 
ments black on the hind margins, or each marked with three black 
spots; length, 4 to 6 mm. Northern Illinois; Colorado, and Los An- 
geles County, Cal. (Journ. N. Y. Ent. Soc, Vol. Ill, p. 103; September, 
1895.) tergata Coq. 
Genus OPSIDIA Coq. 
Opeidia Coquillett, Journal N. V. Ent. Soc, Vol. Ill, p. 102; September, 1895. 
Our single species is black, the first two joints of the antennae and 
the palpi yellow; three postsutural and two or three stemopleural 
macrocha'ta 1 : length, 9 mm. From the type specimen. Massachusetts; 
Atlantic City, N. J., and Iowa. (Loc. cit.) gonioides Coq. 
Genus HILARELLA Rond. 
Hilarella Rondani, Dipterologite Italicte Prodromue, Vol. I, p. 70; 1856. 
Eumacronyckia Townsend, Trans. Ahum-. Ent, Soc, Vol. XIX, p. 98; May, 1892. 
Gymnojtrosopa Townsend, loc. cit., p. 108. 
This synonymy is by the writer. All of our species have three post- 
sutural and two stemopleural inacrocluetie : 
1. Tip of abdomen black, scutellum bearing three pairs of marginal 
macrochsetae 2. 
Tip of abdomen and the genitalia yellow, scutellum bearing only 
two pairs of marginal inacrochsetae, abdomen gray pollinose, 
hind margins of the first three segments black, third vein bristly 
at least halfway to the small crossvein, arista thickened on the 
basal half; length, to 8 mm. From a cotype specimen received 
from Mr. Townsend. Las Cruces, N. Mex., and Los Angeles 
County, Cal. (Trans. Amer. Ent. Soc, Vol. XIX, p. 99; May, 
189i' : EumacronycMa.) decern Town. 
2. Third vein bristly at least halfway to the small crossvein 3. 
Third vein bearing from one to four bristles near its base 4. 
3. Arista thickened on at least the basal three-fifths, abdomen gray 
pollinose, the first three segments each marked with from one to 
three black spots, hind margin of the fourth segment also black, 
antenna? usually but not always yello»w; length, 5 to 9 mm. 
Franconia, jST. H.; JSTew Bedford, Mass.; Avalon and Angelsea, 
N. J., and northern Illinois. From the type specimen. (Jour- 
nal N. Y. Ent. Soc, Vol. Ill, p. 106; September, 1895: Oymno- 
prosopa.) fulvicomis Coq. 
Arista at most thickened on the basal two-fifths, abdomen shining 
