R 
RHYNCHITID.Z—ISOTHEIN 2—TOXORHYNCHINI. 23 
~ 
this is rather slender, apparently equal or a little stouter at base than in 
the middle, of the length of the prothorax, and with the slightest possible 
arcuation. Prothorax densely but not very coarsely punctate (granulate 
by reverse), with the slightest possible indication of a somewhat irregular 
transverse disposition. Elytra rather coarsely punctate-striate, the inter- 
spaces also punctate, but more finely and less conspicuously. 
On account of its small size, the punctate head free from transverse 
corrugations, and the obscurity attaching to the rostrum by its inflexed 
position and not perfectly clear preservation, I have had some doubt about 
placing this insect here, but the position of the rostrum seems to be due 
to the excessive bending of the head, as shown by the longitudinal wrinkles 
behind the summit, which appear to belong to the softer membrane natur- 
ally concealed, and if this be conceded, there seems to be no valid reason 
for refusing it a place here. 
Length over the body from tip of rostrum to tip of elytra (restor- 
ing the head to an assumed natural position), 5-2"; length of rostrum, 
1™; height of body, 1:5"™. 
Florissant, Colorado. One specimen, No. 8515. 
Tribe TOXORHYNCHINI. 
The members of this tribe have commonly a plump, arched body, 
rarely elongate, and are usually of small size, though the largest are nearly 
as large as the smallest of the Isotheini, excepting Trypanorhynchus sedatus ; 
the head is usually shorter, the rostrum straight or gently curved, usually 
of considerable length, and always porrect. 
Table of the genera of Toxorhynchini. 
ROM n ON AORN TOI). ooo oop coo one aoe ue aoe Souda CULUUSadERdGe Docirhynchus. 
Rostrum gently curved. 
Head excluding rostrum almost as long as the prothorax. 
Body elongate, relatively slender, much more than twice as long as high 
: Teretrum. 
Body compact, rounded, stout, scarcely twice as long as high..Toxorhynchus. 
Head excluding rostrum very much shorter than prothorax...... ...--. Steganus. 
