1892.] 
379 
[Scudder. 
The difference between the Gosiute and Lacustrine faunas is 
shown to be much more remarkable when we examine the larger 
groups. Thus, of the sixty-six genera found at Florissant, only 
eighteen occur also in the Gosiute fauna, which contains, besides, 
thirty-one genera not found at Florissant ; and there are even a 
number of tribes which, as far as we yet know, are entirely con- 
fined to one or the other fauna. 
Besides the beetles here mentioned no fossil Rhynchophora 
have been described from any formation, Tertiary or Pretertiary, 
on the American continent, with the single exception of a species 
of Curculionidae which I have called Hylobiites cretaceus and which 
was discovered in the Pierre shales of the Assiniboine River, 
northwestern Manitoba, by Mr. J. B. Tyrrell of the Canadian 
Geological Survey, in 1888. 
In conclusion, the following statements may be made regarding 
the Rhynchophorous fauna of the American Tertiaries in general. 
1. The general facies of the fauna is American, and somewhat 
more southern than its geographical position would indicate. 
2. All the species are extinct, and though the Gosiute Lake 
and the ancient lacustrine basin of Florissant were but little re- 
moved from each other, and the deposits of both are presumably 
of Oligocene age, not a single instance is known of the occurrence 
of the same species in the two basins. 
3. No species are identical with any European Tertiary 
forms. 
4. A very considerable number of genera are extinct, often 
including a number of species. 
5. Existing genera which are represented in the American 
Tertiaries are mostly American, not infrequently subtropical or 
tropical American, and where found also in the Old World are 
mostly those which are common to the North Temperate zone. 
A warmer climate than at present is indicated. 
6. There are no extinct families, but in one instance an ex- 
tinct subfamily with numerous representatives. 
7. The Tertiary European fauna is nearer than our own Terti- 
ary fauna to the existing American fauna in the relative prepon- 
derance of its families, subfamilies, and tribes. 
These conclusions are almost identical, word for word,* with 
those reached from a study of the Tertiary Hemiptera of the 
* Proc. Bost. soc. nat. hist., xxiv : 564-565. 
