OF NATURAL HISTORY. 679 



white, somewhat bilobate : labrum not very obtusely rounded be- 

 fore, a little indented on the disk, white : mandibles piceous at 

 tip : thorax trilineate with black : scutel black : wings hyaline ; 

 nervures blackish : costal nervure and carpus pale greenish : ter- 

 gum with a vitta of blackish spots, almost obsolete towards the 

 tip : tarsi dusky. 



Length one-fourth of an inch. 



2. N. INTEGER. — Greenish-yellow ; antennee, spots and tergum 

 black; costal edge not emarginate at the carpus. [2191 



Inhabits Indiana. 



9 Body greenish-yellow : head with a dilated black vitta on 

 the vertex : antennae black : nasus whitish, not very deeply emar- 

 ginate : labrum white, depressed anteriorly, rounded before : man- 

 dibles piceous at tip : thorax with three much dilated, abbre- 

 viated, black vittse ; an oblique black spot behind the scutel : 

 wings hyaline; costal nervure and carpus dull waxen ; no obvious 

 emargination on the costal edge near the carpus ; nervures black- 

 ish : tergum black ; lateral edge and posterior narrow margins of 

 the basal segments whitish : posterior pair of tibiae 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 the black in its color. 



3. ]N. LONGiCORNis, — Black J beneath, head and before the 

 wings whitish. 



Inhabits Indiana. 



Body black : head yellowish-white, a dilated black spot on the 

 vertex : antennae fuscous, joints elongated : thorax black, line be- 

 fore the wings and wing-scale whitish : 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. 



Length three-twentieths of an inch. 



E3IPIIYTUS Leach. 

 1. E. TARSATUS.— Black ; tarsi and tip of the antennae white. 

 Inhabits Indiana. L ^^ J 



9 Body black : antennae with three and a half or four terminal 



1835.] 



