1895. PROCEEDINGS OF THE NATIONAL MUSEUM. 391 



Genus HEMERODROMIA, Meigen. 



The occurrence in North America of H. precatoria, Meigen, rests on 

 Walker's authority, and will re(|uire verifying- before being accepted. 

 Our species are brought together in the following table: 



ANALYTICAL KEY TO THE SPECIES OF HEMERODROMIA 



Anal cell, or at least the cross vein at its apex, present. 



Thorax and abdomen yellow defecla. 



Thorax and abdomen black alhlpes. 



Anal cell wholly absent. 



1. Thorax, or at least the pleura and sternum, red or yellowish 2 



Thorax wholly blaclc, no large tubercle on underside of front femora near the 



base captus (p. 391). 



2. With a medio-dorsal black vitta on the thorax, front femora destitute of a 



large tubercle on the under side near the base empiformia. 



With two black dorsal vitt;e on the thorax, front femora bearing a large, 



si)ine tipped tubercle on the under side near the base super stit'wsa. 



With no black A'itta on the thorax, front femora as in the preceding species 



nxjatoris (p. 392). 



HEMERODROMIA CAPTUS, new species. 



Male. — Head black, white pollinose, depressed; antenna' and pro- 

 boscis light yellow; proboscis rigid, slightly shorter than height of 

 head, projecting obliquely backward; first antennal joint one-half as 

 long as the second, the third two and a half times as long as the second 

 and one and a half times as broad, broadlj^ oval but tapering to the 

 apex, the apical third styliform; upper side of third joint short pilose; 

 style robust, one-third as long as the third joint; eyes bare, widely 

 separated. Thorax, scutellum, metaiiotum, pleura, and sternum black, 

 opa(]ue grayish pollinose, bristles of thorax and of scutellum micro- 

 scopic. Abdomen brownish black, the sides narrowly, front corners of 

 each segment and the venter, yellow. Legs, including the cox.t?, light 

 yellow, front femora not longer than the cox;e, greatly thickened, 

 nearly three times as thick as the tibije, with small teeth below, as has 

 also the tibia?. Base of front femora destitute of a tubercle on the 

 inner side beyond apex of the folded tibiiie, the spine at this point 

 springing directly from the surface. Wings hyaline, stigma wanting, 

 as are also the discal and anal cells ; second basal cell exceeding the first 

 by about twice the length of the cross vein at apex of the second; 

 upper fork of fourth vein about equaling the length of the penultimate 

 section of that vein. Hal teres light yellow. 



Type. — No. 3151, U.S.N.M.; length, 2 to 3 mm. Five specimens 

 in the National Museum collection. 



Locality. — New York. 



