North American Hymenoptera. 267 



I 



Body black, polished : antenjKB^ first joint rather 

 shorter than the thh'd : scutel rough witli about five 

 raised lines; at tip a broad, compressed^ carinate, sub- 

 acute spine : wings hyaline ; nervures brown : pleura 

 and Jirst joint of the tergum with close-set raised lines : 

 feet^ excepting the inferior surface of the thighs, dull 

 honey-yellow. 



Length three twentieths of an Inch. 



Aside from the color of the antennae and of the inferior 

 surface of the thighs, the scutel differs from that of the 

 preceding species in being rugose, or with about five ele- 

 vated lines, and its terminal spine is much broader at the 

 base and less conic. 



3. D. impatiens. Black ; feet ferruginous ; scutel 

 mutic. 



X 



Inhabits Indiana. 

 Body black, poli; 



scutel 



with the margin deeply depressed and rugose ; the disk 

 elevated, oval, with an acute edge, within which, on the 

 posterior half, is an indentation and a more slight indenta- 

 tion before it, each side of which are two or three punc- 

 tures: wings hyaline, nervures pale brown: ahdomen 



feet 



piceous. 



Length three twentieths of an inch. 



I 



4. D. peddtus. Black ; feet yellowish ; antennae 

 piceous ; third joint long. 

 Inhabits Indiana^ 



V: 



Body polished, impunctured, black : antenna yellow- 

 ish-piceous; 1st joint not much longer than the second; 

 third joint much longest, equal to the 4th and 5th to- 

 gether, and a little arcuated ; remaining joints subequal, 



