54 [May, 1846. 



Color of the head, palpi, mandibles, body beneath, femora and tarsi, as in the 

 preceding ; eyes as in the preceding, black ; head and thorax punctured as in 

 the preceding; the latter each side of the middle with a short, longitudinal 

 profound impression; scutel as in the preceding; elytra uniform, very pale 

 testaceous, lessrugulose, and more closely and distinctly punctured than in the 

 preceding, otherwise as in the preceding; tibiae darker than the femora, and 

 each, as in the preceding, with two spines at tip ; claws as in the preceding. 



Nemognatha, Illig. 



N. bimaculata. Black ; thorax yellow, with two blackish spots. 3 1. long. 

 Pennsylvania. 



Black, densely black hirsute : head profoundly and densely punctured ; an- 

 tennae black, filiform, with the second joint smallest, the following subequal, 

 first and second joint rather hirsute ; eyes black ; a triangular dull rufous spot 

 between the antennae ; mandibles testaceous, with the tips and labrum piceous : 

 thorax yellowish, much and finely punctured, narrower than the head, narrower 

 at base than before the middle ; angles rounded ; basal edge straight ; sides 

 straight from the base to the anterior curve ; each side of the middle before the 

 base, with a roundish oval brownish spot: elytra finely shagreened, with two 

 longitudinal, oblique, raised lines before the middle, very obscurely defined ; 

 wings fuliginous : beneath as above ^posterior and intermediate feet blackish : 

 anterior ones brownish. 



CEdemeridce, Leach. 



ISCHNOMBKA, Steph. 



I. unicolor. Black ; elytra with three faint longitudinal raised lines. 3 1- 

 long. Pennsylvania. 



Necydalis unicolor, Melsh. MS. 



Black, opake : head very minutely punctured and wrinkled, with the front 

 dull cyaneous ; tip of the clypeus testaceous ; labrum black ; antennae fuscous> 

 with two basal joints and palpi dull testaceous : thorax punctured like the head, 

 each side before the middle somewhat depressed ; sides behind the anterior mar- 

 gin abruptly deflexed, and there on the lateral margins a fine, short, transverse 

 raised line ; medial space somewhat flattened, with an obsolete raised dorsal line : 

 elytra finely shagreened, with three fine, rather obsolete lines, beneath black- 

 cyaneous : feet blackish-brown, tibiae and tarsi paler, all with a bluish reflexion. 



Nacerda, Stev. 



1. N. lateralis. Rufo-testaceous, eyes, lateral margins of the thorax and 

 elytra, and abdomen, blackish. 4 1. long ; 1 1. wide, Pennsylvania. 



Rufo-testaceous, finely ashy-pubescent, finely shagreened : antennae ; la- 

 brum long, indented at tip; palpi testaceous ; eyes large, round, deep black : 

 thorax rather oblong, narrowed posteriorly ; faintly impressed in front of the 

 scutel, and even less so each side of the middle behind the anterior margin ; 

 sides each with a black spot, much dilated at the anterior margin, and acute 

 towards the hind angles, which it does not attain : elytra paler than the thorax 

 and head, with the sides parallel ; a broad blackish vitta, which does not 

 cover the lateral edge and tip ; general color of the entire sutural space not as 

 broad as one of the vittae : abdomen brownish : pectus and feet testaceous- 

 yellow. 



