OTIORHYNCHIDA—OPHRYASTINI. 37 
OPHRYASTES PETRARUM. 
Pl. vin, Fig. 10. 
I have placed this insect in the same genus as 0. compactus of the 
Green river beds, from their close general resemblance, although the totally 
different form of the eye would seem to forbid it. It is a little larger than 
that species, and does not so nearly resemble recent species of Ophryastes. 
The head is short and smooth, the snout much enlarged, almost bullate, 
with a short basal neck; the antennal scrobes oblique, passing beneath the 
eye, but straighter than usual in Ophryastes, the eye transverse, oval, with 
a slight obliquity, rather larger above than below. The prothorax is con- 
siderably higher than long, well arched above, the surface uniformly ver- 
miculato-rugose, with no lateral ruga; the rugosities somewhat subdued. 
Elytra well arched, with no very abrupt apical descent, with close series of 
large, attingent, circular punctures (or on the reverses elevated lenticles), 
the series of opposite sides of the elytron showing a tendency to unite 
toward the apex. 
Length, excluding snout, 95™"; of snout, beyond eye, 0°1™; of 
elytron, 73"; height in middle, 4". 
Roan mountains, western Colorado, from the most prolific beds at the 
crest of the bluffs at head of East Salt creek. One specimen, Nos. 338 
and 342, U.S. Geological Survey. 
Here also belongs an elytron, from the very lowest shales on the 
White river, western Colorado, opposite Canyon butte. No. 507, U.S. 
Geological Survey. 
OPHRYASTES GRANDIS. 
PY, ya, Wigs: 7: 
Only a single elytron has been found, but this agrees so well in form 
and sculpture with the other fossil species placed here that I include it in 
the same category, although much large than any of them. The inter- 
spaces between the punctured striz are either naturally very flat or have 
been abraded; the strize suddenly depressed, but not very deeply, except 
by the equally abrupt and somewhat deeper, large, circular puncta, which 
