368 HETEROPTEROUS HEMIPTERA. 



few specimens from the quantity of at least a peck, exposed for 

 sale by an Aztec woman. They are made use of as food. 



It is larger than calva nob., and further distinguished by the 

 immaculate base of the hemelytra. 



NOTONECTA L. Latr. 



1. N. undulata. — Whitish ; scutel and band blackish. 



Inhabits Missouri and Indiana. 



Body greenish-white : thorax dusky or blackish behind : scutel 

 velvet black, a slight dull fulvous spot each side near the base 

 and another more or less dilated, at tip : hemelytra with an 

 undulated, fuscous band behind the middle; tip simply emargi- 

 nate, not fissile : beneath blackish, varied with yellowish : feet 

 greenish. 



Length two-fifths of an inch 



Var. a. Small spots at base of the scutel, none. 



This approaches the description of A 7 ", americana F., which } 

 however, is said to be " postice nigro " corresponding with speci- 

 mens in my cabinet from Mexico. The black color of the poste- 

 rior portion of the thorax is only transmitted from the part of 

 the scutel which is beneath it. 



Var. b. Yellowish, or greenish-white; beneath varied with 

 blackish and yellowish : feet green : hemelytra with three 

 lateral, longitudinal brown spots ; a lateral, submarginal black- 

 ish line. 



Var. e. Scutel black : hemelytra blackish with a line at base 

 and tip whitish. 



Inhabits Mexico. 



This may possibly prove to be a distinct species, but as it pos- 

 sessess many characters in common with the undulatus, I refer 

 it for the present to this species as a variety. I owe it to the 

 kindness of Mr. Ma[c]lure ; it forms part of the collection taken 

 by William Bennett. 



I found an individual in Missouri that appears to be the same 

 as Var. c. [ 813] 



