196 ACADEMY OF NATURAL SCIENCES 



scutel black : elytra densely punctured, rounded at tip, with two 

 longitudinal, blued-black lines on the disk of each : beneath 

 black ; sides of the pectus, margins of the ventral incisures, and 

 middle of the thighs, rufous. 



Length two-fifths of an inch. 



This insect, which is not very uncommon in the vicinity of 

 Council Bluff and the Pawnee villages, bears some resemblance 

 to the vittata of Swederus in Stockh. Trans. 1787, p. 198, and of 

 Hellwig in Melsh. Catal., but in that insect there is but a single 

 elytral vitta. In many other characters it is widely distinct, 

 and approaches somewhat in [417] character to the genus Rha- 

 gium. It varies in having an immaculate thorax and rufous 

 clypeus. 



[Unknown to me. — Leg.] 



2. L. CYLiNDRicoLLis. — Sericeous, rufous ; elytra, tibia, and 

 tarsi blackish. 



Inhabits the United States. 



Rhagium sericeum Knoch in Melsh. Catal. 



Body sericeous, yellowish-rufous : head with a longitudinal, 

 indented line, and a transverse, elevated one between the antennae : 

 antennsB rather longer than the body : palpi blackish : thorax 

 long, subcylindric, with a longitudinal, dorsal, and anterior and 

 posterior, impressed, submarginal lines : elytra blackish, attenu- 

 ated rectilinearly or somewhat concavely from the prominent 

 humerus to the obliquely emarginate or bidentate tip : feet ru- 

 fous : knees, tibia and tarsi, black. 



Length, male more than half an inch ; female more than 

 three-fifths. 



In the male the head is often dusky, and the thorax, with the 

 exception of the more elevated j^art, and the coxre, are blackish. 



In the general appearance of the head and thorax of this 

 insect, it is closely allied to the genus Rhagium, and has been 

 referred to that genus by Mr. Melsheimer in his Catalogue; 

 but as the thorax is destitute of armature, and the autennje are 

 longer than the body, I prefer giving it a place in the present 

 genus, agreeably to the generic characters of Latreille and Leach. 

 I think it ought [418] to form a distinct genus, together with 

 Rhagium trivittatum . 



[Vol. III. 



