March, 1898.] COQUILLETT: DESCRIPTIONS OF OsCINIDjE. 
49 
ack, polished in front of the scutellum bearing numerous black, bristly hairs ; scu¬ 
te um black, subtnangular, along the sides bearing numerous black, bristly hairs and 
a e apex with a pair of bristles which are pressed together toward their tips. Ab- 
omen black, the base yellow. Coxae, femora and tibiae black, the trochanters and 
tarsi yellow. Halteres yellow. Wings hyaline. Length, 2 mm. 
Thirty-two specimens. Virginia; and St. Louis and Kirkwood 
Mo. Type No. 3S07, U. S. Nat. Museum. 
Oscinis virgata, sp. nov. 
. Head yell °w, an ocellar dot, which sometimes extends over the entire frontal 
triangle, the occiput except the lower edge, the antennas including the arista, the 
cypeus 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 
loint of antennae suborbicular, slightly wider than long. Thorax subshining, yellow 
the mesonotum marked with three black vitte, a brown spot beneath the humeri anj 
another beneath the wing; metanotum in the middle black ; scutellum yellow, semi- 
circu ar Abdomen black, the venter yellow. Coxae, femora and tibiae 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. 71 
Oscinis pectoralis, sp. nov. 
Head yellow, the frontal triangle, occiput except the lower edge, and the antennae 
me udmg 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 
mi e o pleura; scutellum grayish black, semicircular; metanotum black. Ab- 
domen black, the base and venter yellow. Coxae, femora and tibiae yellow, the tarsi 
brown. Wings 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 
ower part, brown ; knob of halteres brown. Frontal triangle very small, scarcely 
exceeding the ocelli; third joint of antennee orbicular, as long as wide. Wino- s 
> alme, 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, FJa. (Mrs. A. 
T. Slosson), and Washington, D. C. The specimens from the latter 
ocality were collected on windows by the writer during May and July 
Type No. 3810, U. S Nat. Museum. 
