18 TERTIARY RHYNCHOPHOROUS COLEOPTERA. 
PALTORHYNCHUS (zaAror, puyyos) gen. nov. 
Closely allied to Isothea, described below, differing from it in the gen- 
eral form of the body and the structure of the antennz. The form is dis- 
tinctly parallel-sided throughout nearly the whole of its extent, being 
broadest at the middle of the prothorax. The rostrum is slender and 
twice as long as the rest of the head, straight and porrect, and yet to- 
gether with the head not much, if any, over half as long as the rest of the 
body. Antennze of the same length as in Isothea, the first and second joints 
subequal, scarcely if at all stouter, and certainly shorter than joints 3-8, 
which are subequal, two or three times longer than broad, 9-11 forming 
an elongate ovate club not very deeply annulate, its basal joints at least 
only a little broader at apex than at base. Eyes moderately large, lateral, 
not prominent. Legs rather short and not stout. Third ventral segment 
of abdomen as long as the second. 
Dr. J. L. Le Conte, who, many years ago, cursorily examined one of 
the specimens of this genus, remarked to me that it was a ‘(very strange” 
insect. 
Three species occur in Colorado, one of them not uncommonly. 
Table of the species of Paltorhynchus. 
A large species, with coarse sculpture; elytra with a deep, median, longi- 
tudinal sulcation: <2 ssh. ose sey no SO oe Rene eee ee narwhal. 
A species of medium size with delicate sculpture; elytra with no conspie- 
MOUSs SUC AUON Hes: =) fey ee te eee ae eae ions Tee eee rectirostris. 
A small species, with subdued sculpture; elytra with a pair of longitudi- 
nal suleations, one median, the other subsutural .......-............ bisulcatus. 
PALTORHYNCHUS NARWHAL. 
Pais 10 ele 
A very striking species, with its auger-like beak, coarse sculpture, and 
deeply grooved elytra. The head besides being granulate is transversely 
corrugate. The prothorax, which is fullest in the middle, is coarsely gran- 
ular, the granules circular, and distant from one another by rather less than 
their own diameter, the middle of the sides with a rather coarse arcuate 
