256 ACADEMY OP NATURAL SCIENCES 



the antennae : front brown, deeply impressed witli the grooves of 

 the rostrum, presenting three prominent carinas : rostrum with a 

 fuscous band on the middle, and spot near the tip : thorax yel- 

 lowish : hemelytra white, an obsolete band at base ; an oblique 

 distinct one on the middle united to a curved one beyond the 

 middle, which attains the tip and incloses a linear oblique spot 

 near the tip of the costal margin : feet spotted with fuscous : ab- 

 domen pale yellowish : tergum blackish in the middle. 



Length of the body and wings three-twentieths of an inch. 



Came on board of our boat as we ascended the Missouri, in 

 considerable numbers on the third of July. The hemelytral 

 fascia, may, on many specimens, be traced into the form of the 

 letter W, [3383 the oblique spot being included between the 

 posterior curve of the letter and the costal margin. 



CERCOPIS Fabr. 



1. C. QUADRANGULARis. — Brownish-cinereous ; elytra with 

 two oblique brown bands confluent at the outer margin : beneath 

 black ; feet annulate with pale. 



Inhabits Missouri. 



Body brownish-cinereous, covered with dense, minute hairs : 

 head obsoletely spotted : eyes fuscous, a pale longitudinal line on 

 the middle, in which is a brown central line : stemmata indis- 

 tinct, black : thorax emarginate at the anterior angles for the re- 

 ception of the eyes, and deeply emarginate behind for the recep- 

 tion of the scutel ; a double series of obsolete, indented spots 

 before : scutel, tip and basal angles acute : hemelytra pale brown- 

 ish-cinereons ; an oblique black-brown fascia from the inner basal 

 angle, is confluent at the middle of the exterior margin, with an 

 oblique fascia which terminates near the sutural tip ; tip with a 

 small blackish curve ; region of the humerus dusky ; beneath 

 black : feet black : thighs annulate with pale ; posterior pair of 

 tibiae pale, armed with two robust spines behind, and numerous 

 small ones at tip ; posterior tarsi armed with spinules at the tips 

 of the first and second joints beneath : abdomen black; tail pale 

 beneath. [339] 



Length more than three-tenths of an inch. 



2. C. OBTUSA. — Head and anterior part of the thorax pale, 



[Vol IV. 



