RHYNCHITIDH—ISOTHEIN &—ISOTHEINI. 19 
prominent ruga, followed beneath by a corresponding sulcation, adding to 
its distinctness, fading out before attaining the posterior margin. Elytra with 
similar, but even larger and sometimes more distant circular granules, show- 
ing a tendency, especially on the sutural half, to a longitudinal arrangement; 
a little within the middle of each elytron and parallel to the suture is a deep, 
straight suleation, scarcely fading before reaching either extremity of the 
elytra, and another, perhaps weaker, originating not very far from the same 
point and becoming submarginal. 
Length of body, ticluding rostrum, 10-11"; of rostrum, 2°5-2:75""; 
breadth of body, 2°6-—2-9™™. 
Florissant, Colorado. Four specimens, Nos. 463, 12247 and 12248, 
and from the Princeton collection, Nos. 1.580, 1.847. 
PALTORHYNCHUS RECTIROSTRIS. 
: Plot, Fig: 8. 
A smaller species than the last, with more subdued sculpture, heavier 
and coarser antennze, and relatively longer beak. Head transversely and 
regularly corrugate, with a few independent granulations above. — Prothorax 
not very coarsely, and not prominently granulate, the surface uniform with- 
out a lateral ruga. Elytra feebly striate, with scattered dull granulations 
larger and more distant from each other than those on the prothorax. 
Length of body, including rostrum, 7:25"; of rostrum, 2™"; height of 
body, 3”. 
Florissant, Colorado. One specimen, No. 7714. 
o] } } 
PALTORHYNCHUS ? BISULCATUS. 
Pl. vin, Fig. 3. 
The imperfection of the specimens does not permit certainty in generic 
location of this species, and it is placed here only because of the general re- 
semblance of the surface sculpture of the elytra, which is somewhat remark- 
able. One of the specimens shows only the fragment of an elytron, the 
other the dorsal view of the prothorax and elytra. The prothorax, not per- 
fect, is faintly, distantly, and coarsely punctate, and shows a pair of longi- 
tudinal strize close beside the middle line. The elytra are together about 
