CURCULIONID. 65 
Roan mountains, western Colorado, from the richest shales at the sum- 
mit of the bluff at the head of East Salt creek. One specimen, No. 1055, 
U.S. Geological Survey. From the same locality in slightly lower beds at 
same station. One specimen, No. 117, U.S. Geological Survey. White river, 
western Colorado, from the very lowest shales on the south side of the river 
opposite Canyon butte. One specimen, No. 468, U.S. Geological Survey. 
Family CURCULIONID 4. 
One hundred species, or slightly more than one-half of the Tertiary 
Rhynechophora of North America, belong to the Curculionidee, but this pre- 
ponderance is a little less than in the recent American fauna where the family 
holds a still more important place; and is the more conspicuous from the 
fact that its numbers are more than four times those of any other family, 
while in the Tertiary deposits of the West the Otiorhynchidie have nearly 
half as many species as the Curculionide. In general, the relative 
numerical proportion of the subfamilies is similar to what obtains in North 
America at the present day, or at least the vast proportion of the species 
belong as now to the Curculionine; but the Alophinze possessed then a far 
greater percentage (eight times greater) than now, while the Balaninee were 
also relatively much more numerous, the percentage of species to the whole 
number of the family being then nearly five times greater; the loss fell.on 
the Curculioninee and to a small extent on the Apionine, while the Ithyce- 
rine, now represented by a single species, are not known to have existed. 
In Europe, if we regard the species of Hipporhinus as Alophinz, the 
relative preponderance of the subfamilies of fossil Curculionidae approaches 
nearer and indeed very closely to the condition of things in America to-day, 
for more than four-fifths of the species are to be referred to the Curculionin, 
though the Alophinze are still nearly three times in excess of their present 
American proportion, and the Sitoninz have an even slightly greater rela- 
tive preponderance. As in America, all the subfamilies are present excepting 
the Ithycerine. The total number of species, strangely enough, is exactly 
the same as in America. 
5 
MON XXI 
