312 HETEROPTEROUS HEMIPTERA. 



ance of a cross on the back : beneath yellowish : venter with ab- 

 breviated, lateral, slender, sanguineous lines, tip sanguineous. 



Length two-fifths of an inch. 



When the hemelytra are at rest their sanguineous margins re- 

 present a common cross. 



Curtis gives this genus the name of Acanihosoma, but the 

 character upon which it is instituted enters into the natural 

 [757] character of Edessa, as stated by Fabricius, "Sterno saspius 

 elevato," notwithstanding which, however, he referred some of the 

 species to another genus, probably without observing their dis- 

 tinguishing trait. 



2. E. lateralis. — Tergum sanguineous, lateral margin yellow 

 with a black spot. 



Inhabits North-west Territory and Canada. 



Body yellowish-green, with large, sparse, dusky punctures : 

 antennas a little tinged with rufous ; terminal joint blackish at 

 tip : thorax on the edge immediately behind the posterior lateral 

 angles obtusely deeply emarginate : hemelytra slightly bifasciate 

 with pale fuliginous and a slight spot of the same color on the 

 membranaceous portion : tergum sanguineous : lateral margin yel- 

 low, interrupted with quadrate black spots ; venter pale sangui- 

 neous, with deeper colored punctures and lateral transverse ab- 

 breviated lines. 



Length three-tenths of an inch. 



A smaller species than the preceding and quite distinct by 

 many characters. I obtained several specimens in Major Long's 

 expedition to the source of St. Peter's river. 



PENTATOMA Oliv. Lat. 



■j" Thorax armed on each side with a spine or prominent angle. 



1. P. cynica. — Yellowish, with impressed rufous punctures; 

 antennae rufous. 



Inhabits Missouri. 



Body yellowish tinged with green ; with numerous impressed 

 punctures, those beneath more strongly contrasting : head before 

 the eyes rather wider near the tip than in the middle : antennae 

 pale rufous, first joint oval, yellowish; second joint considerably 

 longer than the third ; thorax with the posterior lateral angles 

 prominent, acute : anterior to which the edge is granulated; tergum 



