138 TERTIARY RHYNCHOPHOROUS COLEOPTERA. 
939 and 940, 1044, 1058, U. 8. Geological Survey. White river, Utah, 
from the very highest beds next Colorado boundary. One specimen, No. 
707, U.S. Geological Survey. 
AULOBARIS COMMINUTA. 
Pl. xu, Fig. 9. 
The form is slender and parallel-sided. All the specimens are some- 
what obscure, not permitting a very close description. The head is longer 
than in the other species, and the eyes small and subcircular; beak short 
and stout, considerably shorter than the prothorax, hardly arcuate. Pro- 
thorax considerably more than half as high again as long, tapering a little, 
hardly full, punctate. Elytra long, but little arched, punctato-striate. Legs 
rather long, the tibize very slender. 
Length, excluding rostrum, 3:5™"; rostrum, 0°6™"; height of body, 
cepa 
White river, Utah, from the highest elevation next the Colorado border. 
Two specimens, Nos. 702, 703, U.S. Geological Survey. The same locality, 
from blocks on the river bank that had fallen from cliffs. One specimen, 
No. 397, U. 8S. Geological Survey. 
CENTRINUS Schonherr. 
A strictly American type with numerous species, of which about half 
occur in North America, mostly in the Southern States. Two species occur 
in our Tertiaries, one at Florissant, Colorado, the other at Green River, 
Wyoming. 
y 
Table of the species of Centrinus. 
Dorsal curve considerable; apex of elytra subacuminate; eyes obliquely oval. . obnuptus. 
Dorsal curve slight; apex of elytra broadly rounded; eyes transversely oval. .diruptus. 
CENTRINUS OBNUPTUS. 
Pl n, Figs 2; Pl yn, Wien6> Fie aie 
Jody ovate, about twice as long as broad, the dorsal curve regular and 
considerable. Tlead fully half as long as high, minutely punctate; eyes 
obliquely oval, moderately large, situated low; beak slender, equal, gently 
