RHYNCHITIDA—ISOTHEIN.-E—ISOTHEINI. 21 
what forward at the base of the rostrum. The prothorax is delicately 
eranulose, as are also the hind femora. 
Length of body, including rostrum, 7:°5°; of head and rostrum, 
3™™"; of antenn, 21"; breadth of abdomen, 2:3". 
Florissant, Colorado; one specimen, No. 1058. 
I name this species for my friend and fellow-student, Mr. J. A. Allen, 
of the American Museum of Natural History, New York. 
TRYPANORHYNCHUS (zpv'zavor, pu'yzxos), gen. nov. 
The form of the body is here more plump than in “the preceding 
genera, and the rostrum, instead of being thrust straight forward, is 
directed more or less obliquely downward. The head is large at base, 
rapidly tapers, with a full outline, and, with the rostrum, is fully two-thirds 
as long as the elytra; the rostrum is stout, rigidly straight, longer than the 
head; the eyes are moderately large, more or less oval, almost or quite 
longitudinal, situated next the base of the rostrum; the antenn are 
inserted a little beyond the base of the rostrum, and in the only specimen 
in which they can be made out the basal joints are destroyed; the antennie 
are about as long as the rostrum, the fourth and fifth joints cylindrical, a 
little enlarged apically, more than twice as long as broad; the sixth to the 
eighth about two-thirds as long as the preceding and more distinctly 
enlarged, and also more or less truncate apically; the succeeding joints 
form a long and slender, oval, loose club twice as broad as the stalk and 
four or five times as long as broad, the joints subequal. The prothorax is 
simple, tumid, and, with the elytra, shows a well-arched back. The legs 
are of moderate length, the fore femora only a little enlarged apically. 
Three species occur in the western Tertiaries, all at Florissant. 
Table of the species of Trypanorhynchus. 
Larger. Rostrum much shorter than head and thorax together, enlarged in its apical 
half; longer axis of eye set at an acute angle with the rostrum....... corruptivus. 
Smaller. Rostrum nearly or quite as long as head and thorax together, tapering 
throughout; longer axis of eye almost identical with that of rostrum. - . .depratus. 
Smallest. Rostrum of the length of the prothorax only, equal-throughout or possibly 
tapering at base; longer axis of eye inclined slightly from that of rostrum. . sedatus. 
