96 S. W. Williston — North American Conopidm. 



Second joint of the antennae but little or not at all longer than the 

 third. Small species (5-5^"""). Baroni, new. 



Second joint of antennse considerably longer than the third. 



Large species (8-9°"") ; femora and tibiae wholly reddish yellow. 



modesta, new. 

 Smaller species (5^-7'"") ; femora, or at least tibiae, in large part 

 blackish. abbreviata. 



For 0. lor aria see below. 



Oncomyia modesta, new species. 



$, ? . Front reddish, black above at the vertex, below the vertex 

 with a large blackish V-shaped spot. Face obscurely yellowish 

 white, the excavated portion shining, the sides and cheeks with a 

 silvery luster extending up along the eyes narrowly to the middle of 

 the front. Cheeks scarcely as broad as the horizontal diameter of 

 the eye. Antennae : first joint blackish, second joint black on its 

 upper half, yellowish red below ; third joint black at its tip and upper 

 border, yellowish red on its basal portion, more especially on tlie 

 inner side, not more than two-thirds as long as second joint, scarcely 

 more than once and a half longer than its width; the two joints of 

 the proboscis of nearly equal length. Dorsum of thorax black, in 

 well preserved specimens with whitish dust, leaving a median 

 narrow blackish line. Abdomen black, with the same conspicuous 

 dust on the sides of second and third segments and nearly covering 

 the remainder; in the female the fifth and sixth segments are very 

 short, the seventh wholly shining. Anterior coxa> mostly yellowish 

 red, with silvery luster; middle and posterior coxa? black, the latter 

 with silvery luster. Legs yellowish red, the tips of the tibiae some- 

 times somewhat blackish. Tarsi blackish toward the tip. Wings 

 with a distinct blackish shade, yellow at the base. Length 72-9""". 



Eight specimens. Washington Territory. California (Baron). 



A single female specimen from Mt. Washington (Mr. W. \\. 

 Patton) resembles the western specimens very closely, but the third 

 joint of the antenujc is nearly as long as the second, and rather more 

 than twice as long as wide. The femora are black on the distal and 

 upper portions, the tibia) are blacker at their tips and the tarsi almost 

 whollv so. These differences make me very much inclined to believe 

 that it is specifically distinct, but a single specimen is not sufficient 

 to decide it. 



