HETEROPTEROUS HEMIPTERA. 335 



anterior body by a profound contraction, and a little wider : he- 

 melytra whitish ; corium with a fuscous band on the middle and 

 spot at tip : thighs pale honey-yellow, fuscous towards their tips; 

 anterior pair dilated, spinous, beneath blackish ; pectus and post- 

 pectus black on the middle : venter black, margin piceous. 



Length one-fifth of an inch. 



This varies considerably in the coloring of the head and 

 thorax, which are sometimes even obscure cinereous, with obso- 

 lete blackish lines, and on the posterior part of the thorax of 

 many specimens are three distinct black lines. It resemble? 

 vincta nob., which, however, is not banded in the middle of the 

 corium. 



8. P. dorsalis, — Thorax with a whitish line; three last joints 

 of the antennae subequal. 



Inhabits Indiana. 



Body dull honey-yellow, punctured : head with an obsolete 

 whitish line : antennae rather robust, dull rufous ; joints a little 

 [780] thicker to the tip; first joint longest; remaining joints 

 subequal; ultimate joint of the usual form but hardly longer 

 than the preceding one : thorax, transverse line not impressed : 

 longitudinal whitish line not reaching the head or scutel : corium 

 with a blackish edge on the inner side at tip ; membrane with a 

 double interrupted dusky line ; abdomen dark livid, with a yellow- 

 ish margin; pectus gray, darker in the middle: feet yellowish; 

 thighs with dusky punctures; anterior pair blackish beneath, 

 and armed with many spines. 



Length over one-fifth of an inch. 



Corresponds with the Fabrician description of Lyyseus crassir 

 maims, excepting that the anterior thighs are armed. 



The following species has the third and fourth joints of the 

 antennae dilated, subovate. 



Subgenus Ptochiomera [Plociiiomera.] 



9. P. nodosus. — Two ultimate joints of the antennae thick : 

 thorax constricted behind the middle. 



Inhabits United States. 



Body piceous-black : antennae yellowish, two ultimate joints 

 equal, dilated, blackish; second joint not longer than the third : 

 thorax behind the middle constricted, particularly to the lateral 



