18 TERTIARY RHYNCHOrHOROUS COLEOl'TERA. 



PALTORHYNGHUS {naXrhv, pvyxo?) gen. nov. 



Closely allied to Isothea, described below, differing" from it in the gen- 

 eral form of the body and tlie structure of the antemife. The form is dis- 

 tinctly parallel-sided througliout nearly the whole of its extent, l)eing 

 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. Antenn.'B of the same length as in Isothea, the first and second joints 

 subequal, scarcely if at all stouter, and certainly shorter than joints 3-H, 

 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, cur.sorily examined one of 

 the specimens of this genus, remarked to me that it was a "verj' strange" 

 insect. 



Three species occur in Colorado, one of them not uncommonly. 



Table of the species of PaUorhynvhus. 



A large species, with coarse sculpture; elytra with a deep, median, longi- 

 tudinal sulcation narirlial. 



A species of medium size with delicate sculpture; elytra with no conspic- 

 uous sulcation revtirosfris. 



A small species, with subdued sculpture; elytra with a pair of longitudi 



nal sulcatious, one median, the other sub.sutural bisulcntxs. 



Paltorhynchus narwhal. 



PI. I, Figs. 9, 10, 18. 



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 



