“160 TERTIARY RHYNCHOPHOROUS COLEOPTERA. 
Family AWN THREE Da 
In the American Tertiaries this family is unusually well developed, its 
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 present except the Xenorchestini, which is the 
smallest to-day. The numbers of the Tropiderini, however, are above 
their present proportion, and those of the Arzeocerini 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 Amer- 
ican rocks. The total number of European fossil species is scarcely more 
than half that of the American. 
Tribe DROPIDERINTI: 
This tribe is wholly wanting in the European Tertiaries, but is very 
well represented in ours, having five species of four genera, of which two 
from Florissant, with one species each, represent extinet types, while the 
others are referred to Tropideres, one species each from Florissant and 
Green River, and Hormiscus from Green River. 
SAPERDIRHYNCHUS (Saperda, nom. gen., pvyzos), gen. nov. 
This striking genus of Anthribidze does not fall in any of the groups now 
recognized as living in North America, but rather belongs to one allied to 
our Ischnoceri termed Discotenides by Lacordaire; for the immensely long 
antenne are inserted on the sides of the rostrum, the antennal scrobes are 
circular and terminal, the rostrum is at base smaller than the head, the eyes 
are rounded and not longitudinal, and the prothoracie ridge is prebasal. 
This group, as defined by Lacordaire in 1866, consisted of only three 
genera, two of which were found in islands of the South Pacific ocean, the 
third, Discotenes, in Brazil. The present formis not very close to that 
genus, having a much shorter thorax, and antenn of different construction, 
somewhat resembling Cerambyrhynchus, a genus of another group found 
only inthe Pacific islands. The following are some of the details of the 
structure of the fossil type. 
