OF NATURAL HISTOllY. 679 



wliite, somewhat bilobate : lubruin not very dbtusoly mmuled be- 

 fore, a little iruU'ntc'd on the disk, wliiti- : iiiatidiljles |ti<'eons at 

 tip: thorax triliiioate with black : scutol black: win^s hyaline • 

 nervures blackish : costal ncrvure and carpus palu greeni.sh : tcr- 

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

 tip : tarsi dusky. 



Lenj^th oiie-1'ourth of an inch. 



2. N. INTK(;kii. — (irccnish-yellow ; antenna), spot.s and tcri'inu 

 black; co8tal edge not eniargiuate at the carpus. [219] 



Inhabits Indiana. 



9 13ody greenish-yellow : head with a dilated black vitta on 

 the vertex : anteniuc black : nasus whitish, not very deeply einar- 

 ginate : labruiu white, deprcs.sed anteriorly, rounded before : man- 

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

 viated, black vittas ; an obli(jue black spot behind the scute): 

 wings hyaline; costal nervure and carpus dull waxen ; no obviou.«i 

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

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

 the basal segments whitish : jiosterior pair of tibijcand 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. X. LONQICORNIS. — Black ; beneath, head and before the 

 wings whitish. 



Inhabits Indiana. 



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

 vertex : antenn:v fuscous, joints elongated : thorax black, line be- 

 fore the wings and wing-scale whitish : wings hyaline, uervure.s 

 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. 



EMTIIYTUS Leach. 

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

 Inhabits Indiana. [220] 



9 Body black : antenn;c with three and a half or four terminal 

 1835.] 



