Mr. Westwood on the Affinities of Clinidium. 221 



For the purpose, however, of tracing this affinity more minutely, I 

 shall now proceed to an investigation of the characters of several of the 

 insects comprized in the family Cticujidce, which, from the interest ex- 

 cited by an examination of many of their organs, must be considered as 

 peculiarly worthy the attention of the entomologist. 



I shall commence this investigation with the Cucujvs rufus, in conse- 

 quence of its being the species supposed by Mr. Kirby to be the most 

 nearly allied to Clinidium. This insect and several others of a similar 

 formation, vaiy so materially from the true Cucvji, in many of their 

 essential characters, as fully to warrant their separation and establish- 

 ment as a distinct genus, which I propose to name, in allusion to the 

 formation of the under side of the head, 



Catogenus.* 



Type of the Genus Cucujus rufus, Fab., Oliv. 



Tab. Supp. xlvi, fig. 2. 



Labrum minutissimum, transversum. A and C. 



Mandibul(B validse, subtriangulares, porrectse, extus rotundatae, intus 

 dentibus tribus obtusiusculis, apice unidentato. A. 



MaxiUcB minutae, planae, subtriangulares, lobo superiori majori, in- 

 tegro, angustato, ciliato, inferior! minuto. Palpi 4-articulati, in lobuni 

 dorsalem inserti, lobo superiori longiores, articiilis tribus basalibus lon- 

 gitudine subaequalibus, sed sensim crassioribus, articulo ultimo majori, 

 elongate, apice subacuto. D. 



Mentnm brevissimum, transversum, antice pauUo angustiur,. E. 



Labium bifidum, laciniis linearibus, angustis, divaricatis, ciliatis ; — 

 palpi in labium, lateraliter inserti, et laciniis ejus paullo longiores, arti- 

 culo Imo tenuissimo elongate, 2do brevi et paullo crassiori, 3tio Imi lon- 

 gitudine, arcuato, apice subacuto. E. and F. 



Antenna; moniliformes, capitis thoracisque longitudine, articulis sub- 

 eequalibus (2do minori.) A. 



Corpus depressum lineari-quadratum. 



Caput subquadratum, depressum, angulis rotundatis, antice clypeo 



* Kdro) (subtus) and yivv<^ (gena.) 



