222 DESCRIPTIONS OF NEW SPECIES. 



b. Elytra not protuberant at base, rounded at tip ; prothorax very 



deeply constricted before and behind, sides strongly rounded, 

 and disk very convex ; head prolonged behind the eyes ; 



Black, front legs, base of thighs, and tibiae more or less yellow ; prothorax 

 sometimes red, very finely pubescent, nearly smooth ; base punctured, 

 paupercula Newm. ; ruficollis Say ; allecta Newm. 61. SPH^ERICOLLIS. 



Black, front legs, base of thighs, and tibiae more or less yellow, prothorax 

 sparsely finely punctured, base punctured ; elytra more coarsely punc- 

 tured, with a yellow vitta extending from the base almost to the tip, 

 sometimes interrupted near the tip, nitidicollis Horn. 62. VIBEX. 



Testaceous, prothorax densely punctured, clothed with yellow pubescence ; 

 elytra more coarsely punctured, with a sutural and lateral black vitta, 

 extending nearly to the tip. 63. AUKATA. 



Piceous or black, prothorax scarcely punctured, feebly pubescent ; elytra 

 less coarsely punctured, with three marginal spots and a sinuate black 

 vitta extending from b&se for three-fourths the length, where it is con- 

 fluent with the posterior spot ; legs testaceous, hind thighs dusky at tip ; 

 a. Vitta reduced to a very short basal streak ; and marginal spots to 

 faint clouds. 64. SCRIPTA. 



c. Elytra not protuberant at base, rounded at tip, prothorax slightly 



constricted at base and at tip, sides tnberculate, head pro- 

 longed behind the eyes ; antennae stout, 3d and 4th joints 

 united equal to 5th ; 



Testaceous, elytra very coarsely punctured, with a small fuscous spot near 

 the side about the middle. 65. GNATHOIDES n. sp. 



D. Prothorax constricted before and behind, hind angles scarcely pro- 



longed, but broadly and feebly lobed ; elytra parallel, truncate at tip. 

 and armed with a strong sutural spine ; palpi not dilated, penulti- 

 mate joint of maxillary nearly as long as last joint ; hind angles of 

 head short, rounded, genae moderate, mouth rather short, front with 

 a deep transverse impression ; antennae slender with 4| joints punc- 

 tured, remainder sericeous ; llth joint not appendiculate ; with 

 antennae longer, and 5th ventral broadly and deeply emarginate with 

 angles acute ; 



Testaceous, finely pubescent, elytra with narrow sutural line, two small 

 clouds near the base, and two about the middle fuscous, (very large 

 species). 66. VALIDA. 



E. Prothorax quadrate, slightly narrowed in front, not constricted but only 



feebly impressed behind, elytra feebly narrowed from the base, 

 slightly truncate at tip; palpi as in B, with the last joint 

 feebly dilated, truncate, and longer than the preceding; head 

 suddenly narrowed behind, but not constricted, very short hind 

 angles, rounded ; antennae with 4^ joints punctured, the re- 

 mainder sericeous llth joint of antennae of $ very strongly 

 appendiculate, 7th and following with a smooth feebly carinated 

 line beneath ; 

 a. Elytra punctured ; 



