64 Journal New York Entomological Society. [Vol. xm. 



four fifths length of wing, apex of first near one third length of the third, the 

 fourth forks a short distance beyond the small crossvein. Length i mm. 



maculipennis.* 



17. Second joint of hind tarsi at most two thirds as long as the first iS 



Second joint as long as the first. Black, the antenna? yellowish brown, hal teres 



yellow, legs brown, the knees, a ring above middle and the apices of the hind 

 tibia; yellow, narrow apices of the tarsal joints whitish. Antennae reaches base 

 of abdomen, joints two to nine slightly longer than wide, the twelfth twice as 

 long as wide. Wings densely haired, grayish and with a large whitish spot 

 near apex of first three posterior cells, nearly whole of fourth posterior cell 

 whitish ; third vein reaches middle of wing, apex of first near that of the third. 

 Fourth joint of hind tarsi as long as the fifth, claws small, equal. Length I mm 



cinclipes. f 



18. First joint of hind tarsi slender, hind tibiae without a spine at apex 19 



First joint of hind tarsi swollen, hind tibia; with a black spine at apex of inner 



side. Black, the basal half of antenna;, mouth parts, scutellum, halteres and 

 legs, yellow. Plumosity of antennae yellowish. Mesonotum thinly gray 

 pruinose and clothed with golden yellow hairs. Legs rather slender, very 

 hairy, first joint of hind tarsi nearly as long as the following two, the fourth 

 slightly longer than the fifth. Wings hyaline, wholly densely haired, third 

 vein reaches middle of wing, apex of first near two thirds length of third. 

 Length 1.5 mm cakaratus.% 



19. Mesonotum black, almost velvety, the gray pruinosity scarcely apparent. Black, 



a yellow humeral dot and the scutellum brownish yellow, knobs of halteres 

 chiefly yellow, legs dull yellowish or brownish. Antenna 1 of female reaching 

 beyond base of abdomen, joints two to nine slightly longer than wide, the tenth 

 over twice as long as wide ; in the male the plumosity is black, tipped with 

 gray. Hairs of body chiefly black. Second joint of hind tarsi two thirds as 

 long as the first, the fourth slightly shorter than the fifth. Wings hyaline, 

 nearly covered with hairs, third vein reaching slightly beyond middle of wing, 

 apex of first near two thirds length of the third. Length 1 to 1.5 mm. 



tenebrosus. \ 

 Mesonotum densely gray pruinose. Black, the halteres yellow, the antenna; and 

 legs dull yellowish. Antenna; of female reaches beyond base of abdomen, 

 joints two to nine slightly longer than broad, joint ten three times as long as 

 broad ; plumosity of male antennae blackish and with gray tips. Hairs of 

 body chiefly yellow. First joint of hind tarsi as long as the following two, 

 the fifth slightly longer than the fourth. Wings hyaline, a small white spot 



* Jacksonville, Florida. A female specimen collected by Mrs. A. T. Slosson. 

 Type No. 8366, U. S. National Museum. 



fBiscayne Bay, Florida. A female specimen collected by Mrs. A. T. Slosson. 

 Type No. 8367, U. S. National Museum. 



% Frontera, Tabasco, Mexico. A male specimen collected February 19, by Mr. 

 C. H. T. Townsend. Type No. 836S, U. S. National Museum. 



\ Eureka, Cal. Four males and three females collected May 22, 24 and Tune 3 

 by Mr. II. S. Barber. Type No. 8369, U. S. National Museum. 



