604 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxih. 



costal cell, a large whitish spot in base of first posterior cell, one in each end of 

 the second posterior cell, none on lower branch of fourth vein, the one in cen- 

 ter of fourth posterior cell extended to margin of wing, only two in anal cell, 

 situated near its apex along the fifth vein; length, nearly 1 mm. 



stellifer, new species. 

 A female specimen, collected June 6 by Mr. H. S. Barber. Washington, District 

 of Columbia. 



Type.—Cixi. No. o-tTO, U.S.N.M. 



18. Mesonotum opaque 19 



Mesonotum polished. Head black, face and mouth parts yellow, antennse dark 

 brown, thorax yellow, mesonotum, except the broad anterior corners and a 

 large spot in front of scutellum, black, pleura spotted with brown; scutellum 

 yellow, middle at base brown; abdomen dark brown, becoming yellowish at 

 apex; legs yellow, destitute of long hairs, knobs of halteres light yellow; wings 

 hyaline, bare except along the apex, third vein beyond its base narrowly 

 separated from the first, but coalescing before its apex, first not extending to 

 middle of third ; length, 1 mm levls, new species. 



A female specimen, collected May 13 by Mr. H. S. Barber. Marlboro, Maryland. 



Tyjje.—C^i. No. 5471, U.S.N.M. 



19. Wings almost wholly covered with brown hairs 20 



Wings bare excei)t the apical fourth, which bears a few scattered brown hairs. 



Head brown, antennje largely yellow, thorax and scutellum dark brown, 

 mesonotum light gray pruinose, abdomen black, legs yellow, knobs of halteres 

 whitish, wings pale grayish, indistinctly mottled with whitish, a small brown 

 stigmal sjsot between two whitish ones, third vein beyond its base separated 

 from the first, but at its middle coalescing for a short distance, first reaching 

 two-thirds length of third and greatly dilated at its apex, as is also the costal 



vein at the same point; length, nearly 1 mm sanguisuga, new species. 



A female specimen, collected May 13 by Mr. H. S. Barber, who reports that it 

 was captured while in the act of biting him. Marlboro, Maryland. 



Type.—Oiii. No. 5472, U.S.N.M. 



20. With no distinct white spots on wings 21 



With a distinct white spot on the small cross vein and another at apex of third 



vein. Head, including its members, dark brown, thorax blackish brown, 

 mesonotum gray pruinose, scutellum dark yellow, abdomen black, almost 

 velvety, legs dark yellow, destitute of long hairs, knobs of halteres yellow, 

 wings grayish hyaline, a darker stigmal spot, third vein beyond its base free 

 from the first, at its middle coalescing for a considerable distance, first reach- 

 ing three-fourths length of third, costal vein distinctly dilated at apex of first; 



length, 1 mm bignttatits, new species. 



A female specimen, collected June 6 by Mr. H. S. Barber. Washington, District 

 of Columbia. 



Type.— Cat No. 5473, U.S.N.M. 



21. Thorax yellow. Yellow, sides of abdomen tinged with brown, second joint of 



hind tarsi two-thirds as long as the first, wings hyaline, third vein beyond its 

 base narrowly separated from the first, at its middle coalescing for a short dis- 

 tance, first reaching three-fourths length of third, costal vein at apex of first 



greatly dilated; length, 1 mm meUen», new species. 



A female specimen, collected by Mrs. A. T. Slosson. Lake Worth, Florida. 



Type.— Cat. No. 5474, U.S.N.M. 



