Scudder.] 
386 
[Feb. 3, 
No family of Rhynchophora is so much more poorly represented 
in Tertiary deposits than in the living fauna as the Scolytidae ; 
this must doubtless be accounted for in a large measure by the 
habits of these insects, living as they do benentli the bark of 
trees, and therefore, as before remarked, less exposed than the 
members of the other families to such accidents as would precip- 
itate them to the bottom of lakes and ponds. In our own coun- 
try they form less than three per cent of the Tertiary Rhyncho- 
phorous fauna, while in the existing fauna they compose more than 
fifteen per cent of the whole. The Platypodinae are represented 
n the European Tertiaries by a couple of amber species of Platy- 
pus, but are not found in our rocks, while the Scolytinae have the 
meager and equal number of five species in the Tertiary deposits 
of either continent. 
In the American Tertiaries the Anthribidae are unusually well 
developed, the proportional representation being considerably 
above what exists to-day. The relative numbers of the different 
tribes are similar to what we now find, and all the tribes are pres- 
ent except the Xenorchestini which is the smallest today. The 
numbers of the Tropiderini, however, are above their present pro- 
portion, and those of the Araeocerini below it. In the European 
Tertiaries, neither the Tropiderini nor the Xenorchestini occur, 
while the actual numbers in the other groups are precisely as in 
the American rocks. The total number of European fossil spe- 
cies is scarcely more than half that of the American. 
This family contains one very striking extinct genus which I 
have called Saperdirhynchus, with excessively long antennae, re- 
minding one of the existing oceanic genus Cerambyrhyncnus. 
February 3, 1892. 
Vice-President B. Joy Jeffries in the chair. Eighty-eight 
persons present. 
Dr. J. Eliot Wolff read a paper on the geology of the Crazy 
Mountains, Montana. 
Mr. Walter G. Chase spoke of the scenery, glaciers, indus- 
tries, and inhabitants of Alaska. 
February 17, 1892. 
President George L. Goobale in the chair. Eighty-seven per- 
sons present. 
