354 ACADEMY OP NATURAL SCIENCES 



Body black, covered with dense fulvous hair : cheeks naked : 

 proboscis rather prominent, black : antennae, two basal joints 

 yellowish : wings hyaline, basal half fuscous, including all the 

 costal cellule and the middle transverse nervures which are 

 darker than the other part ; two exterior transverse nervures 

 margined with blackish : halteres reddish-brown, tip yellow : 

 tergum each side and at tip yellowish : venter, except on the 

 two or three basal segments yellowish : feet fulvous ; tarsi 

 blackish. 



Length over two-fifths of an inch. 



Belongs to Wiedemann's fifth tribe. 



A. LIMATULUS. — Wings fuscous at base and with three fuscous 

 points. 



Inhabits Indiana. 



Body brownish-black: occiput plumbeous, near the neck 

 black, with a black indented line passing up to the vertex : 

 wings dusky, fuscous at base, chiefly on the costal portion of it, 

 which extends attenuating beyond the middle ; anastomosis, in 

 the hyaline portion, margined with fuscous : tergum with four 

 series of silvery points, or rather abbreviated transverse lines. 



Length % three-tenths of an inch. 



Length 9 two-fifths of an inch. [158] 



Var. a. Posterior cross nervure of the central wing cellule not 

 margined. 



Belongs to Wiedemann's second tribe. 



DASYPOGON Meig. 



D. CEPPHICUS. — Black, with short cinereous hair. 



Inhabits Mexico. 



Hypostoma, mystax, and genas silvery : antennae black, jSrst 

 joint of the style longer than the second : vertex concave, but 

 not very profound : stemmata on a common elevation : thorax 

 with a slight appearance of lineations before : poisers yellow at 

 tip: nervures black: tergum with the segments having short 

 white hair each side : metathorax also somewhat silvery each 

 side : anterior coxse with a slender, arquated, transverse, black 

 common line, and a longitudinal black line of separation : ante- 

 rior tibiae with silvery hair. 



Length one-fourth of an inch. 



[Vol. VI. 



