466 CLASSIFICATION OF THE RHYNCHOPHOROUS COLEOPTJfiRA. 



front coxae are widely distant. The side pieces of the metasternum 

 are large, and those of mesosternum also large, ascending ob- 

 liquely. The hind coxae are oval, and widely separated, the tibiae 

 are slender, sinuate, strongly unguiculate at tip, with the articular 

 surface lateral ; tarsi usually dilated, and brushlike beneath, some- 

 times narrow and not scopiferous ; last joint rather long, claws 

 simple, separate. 



Rhinid^. 



Again a different modification of mouth is seen in this sub-family. 

 The gular peduncle becomes a broad short plate projecting for- 

 wards, forming the floor of the mouth, within which the mentum is 

 concealed. The mandibles are smooth and very convex on the in- 

 ner face, while the outer face is rough and flattened, and the teeth 

 project outwards. The beak is long and slender. The antennae 

 are geniculate, the club is smooth and corneous at base, spongy 

 and pubescent for the rest of the surface. The eyes are large 

 and coarsely granulated, and meet on the under surface of the 

 head. The front coxae are very narrowl3'" separated, the under sur- 

 face of the bod}', and the dorsal segments are as in Calandridae, 

 except that the pygidium is covered by the elytra. Tibiae slender, 

 strongly hooked at tip, tarsi narrow, 3d joint bilobed,ciliate at 

 the sides, not pubescent : 4th joint long, claws simple, separate. 



A small black species of Rhina has been found by Mr. G. R. 

 Crotch, in the trunks of Yucca in the Mohave Desert of California ; 

 otherwise the genus occurs generally in tropical America. 



COSSONID.E. 



With the same arrangement of abdominal segments above de- 

 scribed, these insects have an oral structure similar to that of the 

 Hj^lobiini in the true Curculionidae. The gular peduncle is moder- 

 ately long, the mentum distinct, and palpi large. The mandibles 

 are normal in form, convex externallj^, toothed as usual at tip. 

 The beak is moderate, or (Rhyncolus) short and stout. The eyes 

 transverse, moderately finely granulated. The antennae genicu- 

 late, rather stout, club oval annulated, pubescent. Front coxae 

 separate, tibiee hooked at tip, tarsi narrow, 3d joint not dilated. 

 P^'gidium cover^ed by the elytra, smaller than in the two preceding 

 sub-families. 



SCOLYTIDiE. 



The members of this family, which contains some of the most 

 destructive enemies of forest trees, may be easily recognized by 



