DESCRIPTIONS OF NEW SPECIES. 213 



thighs, tibia, and tarsi fuscous. The sexual characters are more 

 strongly developed than in any other species in our fauna. The 

 5th abdominal ring is much swollen, the dorsal segment convex, 

 the ventral one very deeply excavated, with the sides laminate, 

 broadly impressed externally, and obtusely pointed at the end ; 

 the excavation occupies not only the whole of the under surface 

 of the segment, but extends over half of the 4th ventral, as a 

 shallow impression ; the hind tibiae are thickened at the outer end, 

 and acutely carinate on the inner margin for the lower third ; the 

 3d joint of the hind tarsi is nearly one-half as long as the 2d, and 

 scarcely emarginate. Texas. 



TYPOCERUS Lec. 



The species of this genus have not been increased since the pub- 

 lication of my first memoir on Cerambycidoe ; but as the study 

 of typical specimens in the British Museum has enabled me to 

 arrange definitely the synonymy of Mr. Newman's species, I have 

 prepared the following table : — 



A. Antennae black with the 6th and following joints with impressed porifer- 

 ous spaces ; prothorax not strongly rounded on the sides : 



a. Prothorax very coarsely punctured 



* Prothorax margined before and behind with golden hair, legs 

 ferruginous ; 

 Elytra acutely acuminate, chestnut colored, with indistinct yellow bands; 



prothorax narrowed from the base, sides subsinuate ; 1. badius. 



Elytra less acutely acuminate, obliquely truncate, black, with three bands 

 and two basal spots yellow. 2. zebkatcs. 



** Prothorax at base margined with grayish hair, legs and an- 

 tennae black ; 

 Elytra with a broad angulated yellow spot extending from the base to 

 the side margin, inclosing the humeral angle. 3. luxatus. 



b. Prothorax more densely, less coarsely punctured ; pubescence 



golden, denser at base and tip ; legs ferruginous ; 

 Elytra brown with four yellow bands, frequently imperfect or obsolete, 



tip sub-obliquely truncate, and feebly bispinose. 4. yelotixus. 



Pubescence black, grayish at the base ; body entirely black, tip of elytra 



obliquely truncate, shortly acuminate. 5. ldgubkis. 



B. Prothorax strongly punctured, much rounded on the sides before the 

 middle ; pubescence long, grayish, denser at the base, but not 

 golden ; elytra with four yellow bands, more or less confluent, 

 the anterior one basal, the 2d and 3d frequently connected near 

 the suture ; tip subtruncate, not spinose ; legs ferruginous, an- 

 tenna? brown : 



