TERTIARY RHYNCHOPHOROUS COLEOPTERA. 
bo 
[or 
TERETRUM PRIMULUM. 
PL ww, Fig. 3. 
Head very delicately, finely, regularly, and transversely corrugated 
or carded with a few granulations anteriorly; rostrum smooth, imperfectly 
preserved, but evidently very gently curved and nearly as long as the head 
and prothorax combined. Thorax well arched, with feeble, sparse, but 
rather coarse granulations. Elytra with feeble distant carine not well pre- 
served. 
Length, excluding rostrum, 3°75"; height, 1:8"; length of rostrum, 
Utes 
Florissant, Colorado. One specimen, No. 6377. 
TTERETRUM QUIESCITUM. 
Pl. vin, Fig. 6. 
Head obscure but apparently rather coarsely granulose, the rostrum of 
the same character, very gently arcuate, of about the length of the prothorax. 
Prothorax finely and irregularly rugulose, scarcely arched above. Elytra 
finely striate and serially granulose, the granulations pretty large. 
Length, excluding rostrum, 2°77"; height, 1:2"; length of rostrum, 
O.Gzee 
The head is twisted upside down in the specimen drawn. 
Green river, Wyoming, from the upper part of the bluffs behind the 
town. One specimen, No. 740, U. S. Geological Survey. 
This insect bears a close general resemblance to the European Cossonus 
marionii Oust. from the Aix Tertiaries. 
TOXORHYNCHUS (cé6éor, pv'yxos), gen. nov. 
The form is very compact, the dorsum strongly arched. The head is 
conical, nearly as long as broad, the eye large, circular er nearly circular, 
situated at the very base of the snout, the latter delicate, scarcely arcuate, 
at least as long as the head. Antennze, obscurely preserved in only a single 
specimen of one of the species, inserted very near but not at the base of the 
beak, as long as it, slender, the club composed of subquadrate joints not 
