12 TERTIARY RHYNCHOPHOROUS COLEOPTERA. 
these, an extinct genus, Masteutes, has two representatives at Florissant. 
The actual number of species is therefore a little greater than in the 
European Tertiaries where four species have been referred to Rhynchites 
(some of which, as will be pointed out later, will probably be found to be- 
long rather to the Isotheing:) and one to an extinct type, Antliarhinites. 
MASTEUTES (yaorevurns), gen. nov. 
This genus is founded principally upon the first of the two species here 
described, the other being insufficiently preserved to be sure of its position. 
The head is here of small size, conical, with circular or transverse eyes, the 
antennz attached to the middle of the rostrum, about as long as the pro- 
thorax, and consisting of similar, equal, slender joints perhaps twice as long 
as broad, excepting the last three, which form an elongate oval club fully 
twice as broad as the preceding and itself more than twice as long as broad. 
The prothorax is large, tumid, well rounded, and scarcely narrower than 
the base of the elytra. These have longitudinal markings and apparently 
cover the pygidium. 
Two species occur, both at Florissant. 
Table of the species of Masteutes. 
Rostrum much shorter than the prothorax......-.-.----.-+----+--+---+-++++-- rupis. 
Rostrum as long asthe prothorax........---.--.--------.------------------ saxifer. 
MASTEUTES RUPIS. 
Pla, Pigs 29° 
The dorsal view is seen in the only specimen we have. The head and 
rostrum, the latter hardly longer than the head, are very delicately granu- 
late. The prothorax is coarsely and densely granulate, as are also the fore 
femora; the prothorax is tumid, largest in the middle and with convex sides, 
the base a little narrower than the elytra. The position of the fore coxz 
can be seen through the body, showing them to be separated by about one- 
third or one-fourth of the diameter of one of the coxal cavities. Elytra with 
nine visible series of sharp granulate carinze, the granulations indistinct, 
but of the same size as those on the prothorax, though elongate; there are 
also marks of the interspaces having been clothed sparsely with short hairs. 
