Genera of the Cossonida. 569 



first sight of a minute Tenebrio ; and although it is mani- 

 festly much allied to Cossonus, I feel satisfied that it can- 

 not be admitted amongst the numerous specific modifi- 

 cations of that extensive group. Thus, not only is its 

 opake upper-surface sparingly besprinkled with very short 

 and minute fulvescent setaa (a circumstance of great signi- 

 ficance in this particular department of the present family), 

 but its head is considerably broader and more developed, 

 with the eyes (which are rounder and more prominent) 

 consequently much more remotely separated ; its rostrum 

 likewise is wider, shorter, and more parallel (it being 

 merely a trifle narrowed, and gradually so, behind), its 

 prothorax (which is relatively more abbreviated and more 

 oval) is very coarsely, densely, and uniformly punctured 

 all over, but unimpressed (although sub-carinulated) pos- 

 teriority, and its legs (the intermediate ones of which are 

 extremely wide apart) have their femora (the four hinder 

 ones of which are less clavate), their tibias (which are 

 slightly flexuose), and their tarsi, each of them, propor- 

 tionately, more elongated. 



86. BOROPHLCEUS (nov. gen.}. The members of the 

 present genus, which appear to be North- American (one 

 of them having been communicated by Mr. Fry as coming 

 from Mexico, and the other by Mr. Janson), are, I sus- 

 pect, in most collections treated as small Cossoni ; never- 

 theless it seems to me to be scarcely possible to refer them 

 to Cossonus, as rigidly defined, from which they differ, 

 not only in their rostrum being relatively shorter, broader, 

 and nearly parallel (indeed completely so as regards one 

 of the species), but also in their eyes being larger, rounder, 

 more prominent, and more widely separated, in their pro- 

 thorax being more equally and closely (though very 

 coarsely) punctured, and unimpressed behind, in their 

 metasternum being longer, their coxae more approximate, 

 and the third joint of their feet less decidedly simple (it 

 being, although very minutely so, sub-bilobed). 



87. PACHYTROGUS (nov. gen.}. The affinities of this 

 genus, which is founded on an insect from Chili com- 

 municated by Mr. Janson, are extremely difficult ; for 

 whilst the large size and robust general aspect of its type, 

 in conjunction with its somewhat shortened scape, is at 

 first sight entirely suggestive of Stereoborus and Stereo- 

 tribus. its still thicker and broader rostrum (the tendency 



