266 PROCEEDINGS OF THE NATIONAL MUSEVM. voL.xxn. 



separated from the eyes and' reaching about to the middle of the front, 

 rounded below, front outside of the triangle sparsely covered with 

 bristly hairs; antennee yellow, upper edge and apex of the third joint 

 black, arista dark brown; palpi and proboscis yellow, apical portion of 

 the latter black, labella slender, folded back ; meson otura dark brown, 

 somewhat polished, but sparsely covered with an appressed yellowish 

 tomeutum, one pair of small dorsocentral macrochsetse, the bristly hairs 

 not arranged in rows ; pleura reddish yellow, a brown spot on the sterno- 

 pleura and another above the hind coxse ; scutellum yellow, metanotum 

 and abdomen polished brown ; legs yellow and brownish, bases of tarsi 

 yellow; wings hyaline; halteres yellowish white. Length, 1.5 mm. Six 

 specimens, collected at Utuado in January, and Fajardo in February. 

 Type.— Cat. No. 4385, U.S.K.M. 



OSCINIS ANONYMA Williston. 



Forty-nine specimens, collected at Mayaguez, Bayamon, Utuado, and 

 Aguadilla in January, and Fajardo, Arroyo, and Vieques Island in 

 February. Originally described from St. Vincent, West Indies. 



OSCINIS VIRGATA Coquillett. 



Seven specimens, from Bayamon, Utuado, and Aguadilla in January, 

 and Vieques Island in February. The species was originally described 

 from Colorado. 



OSCINIS QUADRILINEATA Williston. 



Three specimens, taken at Bayamon and Mayaguez in January, and 

 Fajardo in February. Originally described from St. Vincent, West 

 Indies. 



OSCINIS OBSCURA, new species. 



Black, the labella, halteres, under side of the abdomen, apices of 

 femora, front and middle tibiae, both ends of the hind ones, and the 

 tarsi except at their apices, yellow; base of abdomen sometimes yellow- 

 ish ; frontal triangle polished, almost touching the eyes at the vertex, 

 reaching the lowest third of the front; labella slender, pointed, folded 

 back; mesonotum and scutellum somewhat opaque, thinly brownish 

 pruinose, no dorsocentral macrochsetae, pleura and abdomen polished; 

 wings hyaline, apex of the second vein midway between the apices of 

 the first and third. Length, 1 to 1.5 mm. Seventeen specimens, col- 

 lected at Mayaguez, Bayamon, and Utuado in January, and Vieques 

 Island in February. 



Type.~Gat. No. 4386, U.S.N. M. 



OSCINIS COXENDIX Fitch. 



Ten specimens, from Mayaguez, Bayamon, and Utuado in January, 

 and Fajardo in February. This species also occurs from New Hamp- 

 shire to Florida, and westward to Colorado. 



