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 Cucujide, 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 Cucujus 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, vary so materially from the true Cucuji, 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. 
Tas. Supp. XLVI, fig. 2. 
Labrum minutissimum, transversum. A and C. 
Mandibule valide, subtriangulares, porrecte, extus rotundate, intus 
dentibus tribus obtusiusculis, apice unidentato. A. 
Mazille minute, plane, subtriangulares, lobo superiori majori, in- 
tegro, angustato, ciliato, inferiori minuto. Palpi 4-articulati, in lobum 
dorsalem inserti, lobo superiori longiores, articulis tribus basalibus lon- 
gitudine subzequalibus, sed sensim crassioribus, articulo ultimo majori, 
elongato, apice subacuto. D. 
Mentum brevissimum, transversum, anticé paullo angustius. E. 
Labium bifidum, laciniis linearibus, angustis, divaricatis, ciliatis ;— 
palpi in labium lateraliter inserti, et laciniis ejus paullo longiores, arti- 
culo Imo tenuissimo elongato, 2do brevi et paullo crassiori, 3tio 1mi lon- 
gitudine, arcuato, apice subacuto. E. and F. 
Antenne moniliformes, capitis thoracisque longitudine, articulis sub- 
equalibus (2do minori.) A. 
Corpus depressum lineari-quadratum. 
Caput subquadratum, depressum, angulis rotundatis, anticé clypeo 
* Kdrw (subtus) and yévug (gena.) 
