61 
3. Femora and tibiae black ; three sternopleural macrochaetae, but the 
lowest one sometimes very small, sternopleural hairs abundant 
and conspicuous . 5. 
Femora and tibia? yellow, abdomen usually yellow, at least on the 
sides at base, second and third segments bearing discal macro- 
chaetae 4. 
4. With three sternopleural macrochaetae, face in profile concave; 
black, the base of antenna 1 , palpi, proboscis, apex of scutellum, 
coxa 1 , femora, tibia 1 , and sides of first two or three abdominal 
segments partly or wholly yellow; length, 8 mm. Los Angeles 
County, Cal. (Inseeta Saundersiana,Yol. I, p.313; 1850: Dexia. 
Masicera eucerata Bigot, Annates Soc. Entomol. France, p. 203; 
1888.) pedestris Walk. 
With only two sternopleural macrochaetae, face in profile strongly 
convex; yellow, the apical two-thirds of the arista, upper part 
oif the occiput except in the middle, and the middle of meso- 
notum black; front in the mate two-fifths, in the female three- 
fourths, as wide as either eye, two pairs of orbital bristles in 
the female, wanting in the male; frontal bristles descending to 
tip of second antennal joint; cheeks bare, one-sixth as broad 
as the eye height; antenna 1 almost as Jong as the face, the third 
joint six times as long as the second, nearly five times as long as 
broad, arista minutely pubescent, thickened on the basal third; 
thorax grayish pollinose, marked with four black vittae, scutel- 
lum bearing four pairs of marginal macrochaetae; venter of 
abdomen destitute of short, stout spines; front pulvilli of male 
as long, in the female one-half as long, as the last tarsal joint; 
wings hyaline, veins in the female bordered with yellowish, 
third vein bearing two or three bristles at the base; length, 7 to 
8 mm. Franconia, N. H., and North Carolina. One male and 
female, the latter collected by Mrs. A. T. Slosson. Type No. 
3541), U. S. National Museum flaveola n. sp. 
With only two sternopleurals; differs from the female of flaveola as 
follows: Black, the second antennal joint and base of the third, 
palpi, proboscis, femora, and tibia 1 yellow, sides of abdomen 
basally sometimes also yellow; third joint of antenna 1 four 
times as long as the second, nearly four times as long as broad; 
veins not bordered with yellowish; length,.") to 5.5 mm. New 
Bedford, Mass.; Cumberland County, N. J., and Tifton, Ga. 
Twelve females, collected by Dr. G. deN. Hough, Mr. C. W. 
Johnson, and Mr. G. K. Pilate gilvipes n. sp. 
5. Arista thickened on only the basal third 6. 
Arista thickened on the basal three- fourths, third joint of antennae 
in the female three times as long as broad, front slightly wider 
than either eye, face in profile concave, abdomen shining, strongly 
tinged with bronze, base of second segment narrowly white polli- 
v nose, second and third segments destitute of discal macrochaetae, 
