0TI0KI1YNGII1DJ-: — Ol'HIiYASTlNI. 41 



at each extremity, hardly arched, the surface bhiiitly rugose. Elytra from 

 two and one-third to two and one-half times as long as broad, verj- gently 

 arched, descending not at all rapidly behind, the sti-ise shallow, marked bv 

 not very deep but moderately large circular punctures, their own diameter 

 apart, inducing very slight transverse creases beside them, which are gener- 

 ally inconS][)icuous. 



Length, excluding rostrum, 4"""°; head and rostrum, 1 l'"""; height of 

 body, l^™"'. 



Roan mountains, western Colorado, from the riches* shales at summit 

 next head of East Salt creek. Five specimens, Nos. 309, 10U2 and 10<)3, 

 1005 and 1006, 1035, and 1056, U. S. Geological Survey; from near the 

 same, one specimen. No. 11, U. S. Geological Survey. 



PHYXELIS Sch<")nlieiT. 



Phyxelis is now a monotypic genus, having but a single species, fonnd 

 on the Atlantic slope of the United States. One or nmre of the four 

 species here refeiTed are found in all the principal Tertiary localities of 

 the West excepting Floris.sant. The species placed here in all probability 

 belong to two or more ditierent genera, and it is doubtful whether an}- one 

 of them properly belongs in Phyxelis. They are placed Irmv provisionally 

 until better specimens may show fm-ther details of their structure. The 

 last two, at least, seem to belong together. 



Table of the species of Phyxelis. 



Larger forms, fxrppding .'}•."»""" in length: 



Eye small, transverse dilapsus. 



Eye large, subcireular exeisxus. 



Smaller forms, less than S-o""" iu length crigoratux. 



The fourth species, being iusutticieutly known, is omitted from the table. 



PllVXKLIS DILAPSL'S. 



PI. VIII, Fi- 11. 



The single specimen is preserved so as to show a nearlv dorsal view. 

 It is a stout, pretty well rounded form. The head is extremely short, hardly 



