268 Say^s Descriptions of 



oval-cylindrlc : nasus with a longitudinal indentation each 

 . side before : mandibles piceous : thorax without dorsal 

 grooves, but a simple one over the wings : wings with a 

 very slight obscure tint; nervures brown: feet honey- 

 yellow. 



Length $ less than one twelfth of an inch. 



Differs from the two preceding species by the elon- 

 gated third joint of the antennse. 



5. D. stigmatus. Black ; feet yellowish ; wings with 



a large stigma. 



Inhabits Indiana. 



Body pollshedj black : antenna piceous ; basal joint 

 yellowish ; second joint closely united to the first; short- 

 est, almost spherical ; 2d and 3d joints subequal : wings 

 hyahne^ nervures yellowish ; stigma large, triangular : 

 ahdomen dull rufous : feet pale honey-yellow. 



Length about one twentieth of an Inch. 



FiGiTES, Latr. 



(Antennae monlllform, thicker towards their extremities. 

 Second cubital cellule wanting.) 



1. F. impatiens. Black; mandibles and feet piceous. 



Inhabits Indiana. 



5 Body polished black : antennce piceous-black, two 

 thirds the length of the body, with scattered hairs; be- 

 yond the sixth joint monihforra ; terminal joint ovate 

 conic : mandibles piceous ; area of the stemmata a little 

 elevated ; behind which, on the occiput, are oblique im- 

 pressed lines : scutel with the margin depressed and 

 rugose, the disk oval, the edge obscurely piceous, with 

 an indentation behind, within the edge : wings hyaline ; 

 nervures yellowish : feet piceous.. 



Length three twentieths of an inch. 



i " 



