128 
silvery, including the vitta, in the female grayish pollinose, the vitta 
brownish; orbital bristles present in both sexes; three postsutural and 
two sternopleural macrochetie, thorax of male grayish pollinose except 
on the front end, not vittate, that of the female gray pollinose and 
marked with four black vittze; 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 Dlinois; Colorado, and Los An- 
geles County, Cal. (Journ. N.Y. Ent.Soc., Vol. I], p. 103; September, 
SOG Nae tine cand Bete UF Ae ieee oo Ae Oe octamer eaheee ae tergata Coq. 
Genus OPSIDIA Coq. 
Opsidia Coquillett, Journal N. Y. Ent, Soc., Vol. III, p. 102; September, 1895. 
Our single species is black, the first two joints of the antenne and 
the palpi yellow; three postsutural and two or three sternopleural 
macrochetie; length,9 mm. From the type specimen. Massachusetts; 
Atlantic City, N. J.,and Iowa. (Loe. cit.)...-.......:.. gontoides Coq. 
Genus HILARELLA Rond. 
Hilarella Rondani, Dipterologie Italice Prodromus, Vol. I, p. 70; 1856. 
Eumacronychia Townsend, Trans. Amer. Ent, Soc., Vol. XIX, p. 98; May, 1892. 
Gymnoprosopa Townsend, loc. cit., p. 108. 
This synonymy is by the writer. All of our species have three post- 
sutural and two sternopleural macrochete : 
1. Tip of abdomen black, scutellum bearing three pairs of marginal 
macrochetee. (2 207s US hoe ei ee seers een eto ee ea 2. 
Tip of abdomen and the genitalia yellow, scutellum bearing only 
two pairs of marginal macrochete, 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,6to8mm. 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, 
LB OD. EI UIMNACHONY CHIC.) ee tek crocs aie 122s te ae ee decens Town. 
2. Third vein bristly at least halfway to the small crossvein .-.....- 3. 
Third vein bearing from one to four bristles near its base ......- A, 
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, 
antenne usually but not always yellow; length, 5 to 9 mm. 
Franconia, N. H.; New Bedford, Mass.; Avalon and Angelsea, 
N. J., and northern [linois. From the type specimen. (Jour- 
nal N. Y. Ent. Soc., Vol. III, p. 106; September, 1895: Gymno- 
aa DTOSODAA 2 282 8 Sree Se RE eee ee ee Julvicornis Coq. 
Arista at most thickened on the basal two-fifths, abdomen shining 
