129 
black, the bases of the last three segments gray pollinose; 
length, 4 to 5 mm. Southern Illinois; Atlanta, Ga., and Florida. 
(Trans. Amer. Ent. Soc, Vol. XIX, p. 109; May, 1892: Gymno- 
prosopa. Gymnoprosopa argent if rons Townsend, loc. cit. Gymno- 
prosopa clarifrons Townsend, loc. cit.) polita Town. 
4. Third vein bearing three or four bristles near its base, the outermost 
at the first fifth of distance to the small crossvein, abdomen gray 
pollinose and marked with five rows of black spots, the two 
outer ones situated on the lateral margins; arista thickened on 
the basal two-fifths; length, 5 to 6 mm. Olementon, X. J.; Tif- 
ton, Ga. ; Colorado, and Los Angeles Co., Cal. (Diptera Scandi- 
navia?, Vol. Ill, p. 1213; 1844: Miltogramma.) . . .siphonina Zett. 
Third vein bearing a single bristle near its base, arista thickened 
on the basal three-fourths : 5. 
5. Frontal vitta next the antennae almost as wide as either side of the 
front, abdomen gray pollinose, the first segment and three large 
spots on the second and third shining black; black; face white, 
sides of front yellowish pollinose, front in the male one-half, in 
the female as wide as, either eye, two pairs of orbital bristles in 
both sexes, antenna? four -fifths as long as the face, the third 
joint four times as long as the second, penultimate joint of arista 
broader than long, cheeks scarcely one-sixth as broad as the 
eye height, vibrissa? fully developed, only two or three bristles 
above each; thorax gray pollinose, marked with four black 
vitta 1 , scutellum gray pollinose, the sides black, wings hyaline, 
calypteres white, lnacrochreta? of abdomen short and depressed, 
only marginal; length, 4 to 5 mm. Southern Illinois and Colo- 
rado. One male and two females, the former collected by Mr. 
Charles Kobertson, the latter by Mr. Carl F. Baker. Type Xo. 
3634, U. S. Xational Museum aristalis n. sp. 
Frontal vitta next the antenna? less than one- third as wide as either 
side of the front ; black, the antenna?, face, palpi, and first three 
segments of abdomen yellow, abdomen shining except the 
whitish pollinose bases of the last three segments; front in both 
sexes almost as wide as either eye, antenna? in the male five- 
sixths, in the female three-fourths, as long as the face, the third 
joint in the male six, in the female four, times as long as the 
second, thorax gray pollinose, not vittate, wings hyaline, calyp- 
teres white; length, 4 to 5 mm. Holly Springs, Miss. Three 
males and one female, collected by F. W. Mally . . rufiventris n. sp. 
Unrecognized species. — H. (Eumacr onychia) elita Townsend, Trans. 
Amer. Ent. Soc, Vol. XIX, p. 100; 1892. Las Graces, X. Mex. 
3359 9 
