142 Mr. Crotch's DcscrijJtions of 



family, by the square emargination of the clypeus; it is 

 confined to Mexico, and Central and Suuth America. 



The sj)ecies are very embarassing, as the variation of 

 colour is very great ; further material is required to decide 

 some of the questions. 



The species have a wide range, several occurring from 

 the Amazons through Cayenne to Ecuador and Bolivia. 



2. Psela/phacus cUstortus, sp. nov. 



P. curvii^edi simillimus, thorace crebrius punctato, fas- 

 ciis elytrorum (prasertim ultima) integris, vel vix denti- 

 culatis. L. c. 6-7i lin. 



Mexico. Coll. Crotch. 



The Nicaraguan specimens differ from the Mexican in 

 having the interstices scarcely punctulate, and the two 

 medial fasciae decidedly denticulate. 



3. Fselaphams vitticollis, sp- nov. 



P. dentato affinis, thorace fulvo, margine tenui, vitta 

 discoidali, punctoque utrinque nigris ; elytris basi nigra, 

 annulo apicali incompleta. L. c. 5^-6 lin. 



N. Granada. Coll. Crotch (Eeiclie, Chevrolat). 



The Nicaraguan specimens difter from those from New 

 Granada in that the central vitta of the thorax is reduced 

 to a basal triangle. 



4 Psdap)liacus signatus, Guer. Eev. Zool. 1841, p. 158. 



Also found in Cayenne, Amazons, Columbia, Ecuador 

 (Bucldcy), and Bolivia. 



Syn. : P. signatipcnnis, Lac. Mon. Erot., p. 84 (1842). 



5. Psdapliacus Nicaragua', sp. nov. 



Oblongus, subparallelus, niger, nitidus, capite sat crebre 

 punctato ; thorace quadrato, lateribus rotundatis, ante an- 

 gulos posticos angulos sinuatis, parce subtiliter punctato, 

 punctorum majorum seriebus dorsalibus 2 ; scutello nigro, 

 Itevi : elytris nigris, subtilissime parce punctulatis, leviter 



