tS. W. Williston — North American Conopidm. 97 



Oncomyia abbreviata. 



Oncomyia ahh-eviata Loew, Centur., vii, 73. 



5 $ , Black with clilutely cinerescent, subopaque pollen. Face 

 and cheeks light yellowish, with a silvery luster on the sides, ex- 

 tending up narrowly on the sides of the front. Front lutescent, 

 with a black V-shaped spot above, sometimes only blackish on the 

 upper part. Antennae red, black along the upper border, second 

 joint nearly half as long again as the third. Second joint of the 

 proboscis a little shorter than the first. Dorsum of thorax grayish 

 pollinose, in well preserved specimens with two faint, more thickly 

 pollinose, median, slender sti'ipes on front part of thorax. Abdomen 

 cinereous pollinose, more shiny along the middle. Legs, varying 

 from blackish, except the bases of femora, tibite and tarsi, to yel- 

 lowish red, with a blackish spot on the end of femora, the distal 

 half of all the tibia? and terminal joints of tarsi black. Wings 

 lightly infnscate, veins obscurely fuscous, towards the base reddish. 

 Length 5|-7'"''\ 



The hind femoi'a always show the base more broadly reddish, and 

 when the spot is confined to the tips of the femora it is only fus- 

 cous in the hind pair. These differences would make me doubt the 

 unity of the species were it not that nearly a dozen specimens were 

 taken at the same time and place (Conn., June 25). I do not think 

 it at all doubtful that it is Loew's species ; he had light colored 

 specimens, in which the front was more reddish, and the faint dorsal 

 stripes wholly imperceptible, A single specimen from Washington 

 Territoi'y I can in no wise distinguish unless, perhaps, the second 

 antennal joint is a little shorter. Other specimens I have from New 

 York, also District of Columbia (Lw.) 



Oncomyia Baroni, new species. 



(5 ^ . Closely related to O. abbreviata, but the second joint of the 

 anteiniiB is shoi-ter, scarcely longer than the third; the color is more 

 shining black and the specimens are all distinctly smaller. Front 

 blackish above, shiny, except two opaque elongate spots convergent 

 in fi-ont, yellow on lower part. Antennre black ; the second joint 

 below, and the third joint, except the upper anterior part, reddish. 

 Second joint of proboscis shorter than the first. Legs in most of the 

 specimens reddish yellow at the base of front and middle femora, 

 basal half of hind femora, base of all the tibia? and tarsi ; the remain- 



