12 TERTIARY RHYNCHOPHOROUS COLEOrTERA. 



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 l)e foinul to be- 

 long rather to the Isotheinae) and one to an extinct type, Antliarhinites. 



MASTEUTES {txaarevTr^^), 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 liere of small size, conical, with circular or transverse eyes, the 

 antenn* 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 roinided, and scarcely narrower than 

 the base ()f 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 as the prothorax saxifer. 



Masteutes rupis. 



PI. Ill, Fig. 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 prothoi'ax is tumid, largest in the middle and with convex sides, 

 the base a little narrower than the elytra. The position of the fore coxae 

 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 carinaj, 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. 



