32 Annals Entomological Society of America [Vol. VI, 



This seems to be a southern species, Dr. Loew reporting it 

 from Florida and Washington, D. C, ; the only specimens I 

 have seen (one female and two males) were taken by Mr. 

 Nathan Banks at Falls Church, Va., July 10th to Sept. 26th. 



4 Neurigona carbonifer Loew. 



Figure 4. 

 Saucropus carbonifer Loew, Diptera Americae Septentrionalis Indigena, ix, 

 84, 1869. 



Thorax and abdomen yellow, the former with the flattened space 

 in front of the scutellum black, the latter with black bands; hypopygium 

 yellow; front tarsi with an oval tip. Length 4-5 mm. 



Male : Face and palpi silvery white, the latter longer and narrower 

 than in most species; face rather wide for a male, and with the sides 

 nearly parallel; front and occiput black, thickly covered with white 

 pollen; proboscis and antennae yellow, the latter with the third joint 

 s:nall, arista brownish; orbital cilia and post-vertical bristles yellowish. 

 Thorax reddish yellow, flattened space before the scutellum, a large 

 spot on the pleurae, another above and in front of the middle coxae, and 

 a small spot in front of the halters black; a dark line between the 

 acrostichal bristles, and sometimes along the row of bristles on either 

 side; humeri yellowish white; bristles of the dorsum well developed, a 

 large yellow bristle on the pleurae above the front coxae; scutellum pale 

 yellow, slightly darkened at base; metanotum black. Abdomen yellow 

 more or less distinctly banded with black on the second and third seg- 

 ments; first and fifth segments with yellowish hairs, the large bristles 

 on the hind margin of the first, and the hairs on the dorsum of the 

 second, third, and fourth segments black; venter yellow with long, 

 yellow hairs on the fourth segment, hypopygium, its appendages, and 

 the sheath on the venter of the fifth segment yellow. Coxae and legs 

 pale yellow, all the hairs and bristles of the front coxae whitish, some- 

 times the larger bristles brownish in certain lights ; middle coxse with a 

 few black hairs and bristles in front near the tip; front tarsi twice as 

 long as their tibiae first joint three-fourths as long as their tibiae, the 

 fourth joint whitish and widened at the tip, fifth joint black, flattened, 

 forming an oval tip to the tarsi; middle metatarsi about the same 

 length as their tibiffi; first joint of hind tarsi shorter than second, wings 

 hyaline; veins brown; last section of fourth vein very sharply bent 

 forward near the middle, ending before the apex of the wing, rather 

 close to the tip of third vein. 



Female: Venation the same as in the male; front metatarsi about 

 three-fourths as long as their tibiae; front coxae with yellow hairs and 

 black bristles; the bands on the abdomen narrow but sharply defined; 

 there are no black spots on the pleurae as in the male except the usual 

 one in front of the halters; and no central line on the dorsum; the 

 flattened space before the scutellum seems to be black as in the male, 

 but is so much injured by the pin that I cannot be sure. 



