*S'. W. Will/'stou — North American Conopklce. 95 



Antennae black, the second and third joints of nearly equal length ; 

 the divisions of proboscis rather longer than anterior tibitu. Tho- 

 rax with whitish pile ; humeri, a small vittula in front of the root of 

 the wings, and a circular spot near tip of scutellum yellow. Abdo- 

 men with similar whitish pile; first segment whoU}' black, second 

 segment with a narrow posterior yellow border, slightly dilated in 

 the middle ; third and fourth segments similar except that the trian- 

 gular is successively larger and acutely prolonged anteriorly ; fifth 

 segment with a narrow spot. Venter yellow, with a black basal tri- 

 angle. Coxa3 black. Legs yellow ; anterior femora, except the apex, 

 jiosterior femora with a rather broad subapical annulus, and all the 

 tarsi black. Halteres yellow. Wings subinfuscated, lighter toward 

 the base. 



$ . Like the male, except that the front is more broadly yellow on 

 the sides ; the face, cheeks and anterior coxfe are yellow, and the 

 black of the anterior femora confined to a subapical dorsal spot. 



Length 6i"'"', Connecticut, New York (Prof. Comstock). 



In the absence of black on the head and legs, the female differs 

 strikingly from the male. Specimens of both sexes were, however, 

 taken at the same time and place, and doubtless belong together. 

 Loew described the male. 



Oncomyia. 



Occemyia Rob. Desvoidy, Dipt. des. Euvir. de Paris, 50 (1853). 

 Oncomyia Loew, Centiir., vii, 73. 



Medium size to small species, nearly bare, moderately shinhig, 

 dark colored, very similar to Zodion in appearance. Face rather 

 larger than in Zodion, along the oral margins with a row of hairs ; 

 cheeks narrower than the vertical diameter of the eyes. Second 

 joint of antennte elongate, third as long or shorter than the second, 

 oval. Proboscis slender, elongate, with a hinge near the middle, 

 the terminal portion folding back as in 3fi/opa. Abdomen elongate, 

 moderately narrowed tow^ard the base, very convex above ; process 

 of the fifth segment below in the female large. Anal cell of the 

 wing acute, extending toward the border. 



The species of Oncomyia are very difficult to distinguish, and the 

 coloration, especially of the legs, is variable. The only way that a 

 certain knowledge of them will be obtained is by the study of large 

 collections, made in the same localities, and properly labeled. For 

 this reason T have not thought it desirable to describe isolated speci- 

 mens, though by so doing several additional species would have been 

 added. 



Trans. Conn. Acad., Vol. VI, 1883. 13 July, 1883. 



