124 DIPTERA OF NORTH AMERICA. 



Hob. North Red River. English River. (Robt. Kennicott.) 

 Observation. Stumps of veins proceed sometimes from the pos- 

 terior side of the fourth longitudinal vein. 



Gen. III. SEPEDOIV LATE. 



All the described species of the genus Sepedon agree much in 

 their structure and are very readily and sharply distinguished from 

 those species of Tetanocera which approach them in the whole 

 structure of the body, as, for instance, Tet. obliterate/, Fall, and 

 gracilis Loew. The most striking difference consists in the form 

 of the heads with the protuberant eyes, the excavated front and in 

 the second antennal joint being very much prolonged and attenu- 

 ated. Among the four N. A. species known to me three fully 

 agree as to these characters with the described species, but the 

 fourth considerably differs from them by having the second anten- 

 nal joint, though much prolonged, not attenuated, but broad as in, 

 the species of the genus Tetanocera, while its head is in every 

 respect that of a Sepedon, so that, if we will not form a new genus 

 for it, it cannot by any means be placed in Tetanocera; I consider 

 it as the type of a new group of Sepedon. 



Synopsis of the Species. 



, ( Second joint of the antennae broad. 1 fuscipennis LOEW. 



I Second joint of the antennae narrow. 



!Hind femora slender and very much prolonged, with a brown ring be- 

 fore the tip. 2 macropus WALK. 

 Hind femora rather much thickened, with no brown ring before the 

 tip. 



I Under side of the hind femora in the male with a deep excision and 

 two teeth. 3 armipes LOEW. 



Hind femora of both sexes simple. 4 pusillus LOEW. 



1. S. fuscipennis LOEW. and $> Rufo-brunneus, secundo an- 

 tennarum articulo lato. 



Chestnut-brown, second joint of the antennae broad. Long. corp. 0.26 

 0.27. Long. al. 0.27. 



SYN. Sepedon fuscipennis LOEW, Wien. Ent. Monatsch. Ill, 299. 



Of a rather dark chestnut color. Head a little paler. Front 

 with a very wide excavation and an oblong black spot on each side 

 near the orbit, and a deep black dot-like one below each antenna 



