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 argenUfrons Town send, 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 cross vein, 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. Clementon, IST. J.; Tif- 

 ton, Ga. ; Colorado, and Los Angeles Co., Cal. (Diptera Scandi- 

 navicB, Yol. 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 autennie 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, auteuniie 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', scutellum gray pollinose, the sides black, wings hyaline, 

 calypteres white, macroch.et;^. 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 Robertson, the latter by Mr. Carl F. Baker. Type No. 



3634, U. S. National 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, antenme 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 . . rujiventris n. sp. 

 Unrecognized species.— H. [EumacronycUa) elita Townsend, Trans. 

 Amer. Ent. Soc, Vol. XIX, p. 100; 1892. Las Cruces, N. Mex. 

 3359 9 



