oTiouiiVNciiiD.i; — oriiuvASTiM. 37 



Or-HRYASTKS PETRARUM. 



PI. VIII, Kif.-. 10. 



I have placed this insect iii tiic siiiiie (melius us 0. compactits of tht> 

 Green river beds, from their close g'eneral resemblance, althuu<^h the totally 

 different form of the eye would seem t<i t'mliid it. It is a little larycr tlum 

 that species, and does not so nearly re-semble recent species of Ophryaste.s. 

 The head is short and sinootli, the siimit much enlarj^ed, almost bullate, 

 with a short ba.sal neck; the antenna! scrobes oblique, pa.ssing beneath the 

 eye, but straij^htc^r than usual in Opliiyastes, the eye transverse, oval, with 

 a slight obli(|uity, rather hirger al)0ve than below. The jirothorax is con- 

 siderably higher than long, well arched above, the surface nniforndy 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), 

 tlie series of opposite sides of the elytron showing a tendency to unite 

 toward the apex. 



Length, excluding snout, O")"'™: of snout, beyond eye, Ol™""; of 

 elytron, 7-3"""; height in middle, 4""". 



Roan mountains, western Colorado, from tlie 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 ver\- lowest shales on the 

 White river, western Colorado, opposite Canyon butte. No. 507, U. S. 

 Geological Survey. 



Ophryastes grandis. 



PI. viir. Fig. 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 stria- are either naturally very Hat or have 

 been abraded; the stiije suddenly depressed, but not very deeply, except 

 by the equally abrupt and somewhat deeper, large, circular puncta, which 



