March, 1898.] CoQUILLETT : DESCRIPTIONS OF OSCINID^E. 49 



black, polished, in front of the scutellum bearing numerous black, bristly hairs ; scu- 

 tellum black, subtriangular, along the sides bearing numerous black, bristly hairs and 

 at the apex with a pair of bristles which are pressed together toward their tips. Ab- 

 domen black, the base yeHow. Coxa:, femora and tibiae black, the trochanters and 

 tarsi yellow. Halteres yellow. Wings hyaline. Length, 2 mm. 



Thirty-two specimens. A^irginia; and St. Louis and Kirkwood, 

 Mo. Type No. 3807, U. S. Nat. Museum. 



Oscinis virgata, sp. nov. 



Head yellow, an ocellar dot, which sometimes extends over the entire frontal 

 triangle, the occiput except the lower edge, the antenna.' including the arista, the 

 clypeus and apex of proboscis, black ; frontal triangle polished, reaching only slightly 

 below the middle of the front, the latter bearing numerous short, black bristles ; third 

 joint of antennae suborbicular, slightly wider than long. Thorax subshiniDg, yellow, 

 the mesonotum marked with three black vittse, a brown spot beneath the humeri and 

 another beneath the wing ; metanotum in the middle black ; scutellum yellow, semi- 

 circular. Abdomen black, the venter yellow. Coxa?, femora and tibia- yellow, outer 

 side of front femora, and the front and hind tibia, tinged with brown ; tarsi brown. 

 Halteres yellow. Wings hyaline. Length, 3 mm. Colorado. 



A specimen of each sex collected by Carl F. Baker. Type No. 

 3808, U. S. Nat. Museum. 

 Oscinis pectoralis, sp. nov. 



Head yellow, the frontal triangle, occiput except the lower edge, and the antenna; 

 including the arista, black ; frontal triangle polished, reaching only slightly below the 

 middle of the front, the latter bearing black bristly hairs ; third joint of antennae 

 nearly circular, slightly wider than long. Mesonotum subshining grayish black, the 

 sides and pleura reddish yellow, a brown spot beneath the humerus and another near 

 middle of pleura ; scutellum grayish black, semicircular ; metanotum black. Ab- 

 domen black, the base and venter yellow. Coxae, femora and tibiae yellow, the tarsi 

 brown. Wir.gs hyaline. Length, 3 mm. 



Franconia, N. H. A female specimen collected by Mrs. A. T. 

 Slosson. Type No. 3809, U. S. Nat. Museum. 



Sigaloessa flaveola, sp. nov. 



Yellow, dorsum of thorax and of abdomen reddish yellow, the antennal arista 

 and anterior oral margin black, a vitta on middle of occiput, a spot on front end of 

 thorax, one above each humerus, a vitta on upper part of pleura and two spots on the 

 lower part, brown ; knob of halteres brown. Frontal triangle very small, scarcely 

 exceeding the ocelli ; third joint of antenna- orbicular, as long as wide. Wings 

 h) aline, third and fourth wings strongly converging toward their tips, apex of second 

 vein only slightly beyond the hind crossvein. Length, 1.5 to 2 mm. 



Eight specimens. Franconia, N. H., Biscayne Bay, Fla. (Mrs. A. 

 T. Slosson), and Washington, D. C. The specimens from the latter 

 locality were collected on windows by the writer during May and July. 

 Type No. 3810, U. S Nat. Museum. 



