\ 



North American Hymenoptera. 219 



Inhabits Indiana. 



$ Body greenish-yellow : head with a dilated black 

 vitta on the vertex: anienn<z black: nasxis whitish, not 

 very deeply emarginate : lahrum white, depressed ante- 

 riorly, rounded before : mandibles piceous at tip : thorax 

 with three much dilated, abbreviated, black vittae ; an 

 oblique, black spot behind the scutel : ivings hyaline ; 

 costal nervure and carpus dull waxen ; no obvious emar- 

 gination on the costal edge near the carpus ; nervures 

 blackish : tergum black ; lateral edge and posterior nar- 

 row margins of the basal segments whitish : jposterior 

 pair oftibice and tarsi black- 

 Length over one fourth of an inch. 

 Resembles the preceding, but the form is much more 

 robust, and that species has the usual emargination of the 

 costal edge- The present species has much more of 

 black in its color. 



+ 



3. N. longicornis. Black ; beneath, head and before 

 the win^s whitish. 



Inhabits Indiana. 



Body black: head yellowish-white, a dilated black 

 spot on the vertex : antenna fuscous, joints elongated : 

 thorax black, line before the wings and wbg-scale whit- 

 ish : wings hyaline, nervures fuscous ; carpus rather 

 large, yellowish : beneath greenish, or yellowish-white : 

 pleura with two black spots beneath the wings, the 

 anterior spot longitudinal. 



Lenffth three twentieths of an inch. 



J 



Emphytus, Leach. 



antennae 



white. 



