jointed, first joint shortest, last joint longest; 

 proboscis shorter than the head ; thorax sub-glo- 

 bular, convex above, and projecting a little for- 

 ward acutely before; beneath convex; scutel 

 transverse; wings moderate, somewhat lanceo- 

 late ; poisers naked ; feet unequal ; anterior pair 

 with the coxae somewhat elongated; thighs di- 

 lated^ and with a series of spines on the lower 

 side; tibiae arcuated, accurately closing on the 

 inferior surface of the thigh; tarsi moderate; 

 intermediate pair slender, longer than the ante- 

 riors ; third pair longest, slender, the tarsi elongat- 

 ed, terminated by a single long and slender nail. 



OBSERVATIONS. 



This genus is closely allied to Tanypus, Chi- 

 RONOMus, and Ceratopogon, but it differs from 

 them by the remarkable conformation of the 

 anterior and posterior feet. 



PLATE xxxv. 



