DESCRIPTIONS OF SPECIES. 
Family RH YNCHITID2. 
There is no family of American Rhynchophora paleontologically more 
interesting than the Rhynchitidze. In point of numbers the species of this 
group form 104 per cent of the fossil Rhynchophora of North America, 
while the recent species comprise less than 24 per cent of the existing fauna. 
They were also vastly more numerous, both absolutely and relatively, than 
in Europe, where they compose only about 3°3 per cent of the Tertiary 
Rhynchophora. 
In keeping with this fact of their numerical importance is that of their 
variety of type. Our existing native species have been grouped in two sub- 
families, one composed of three genera, the other of one. All these genera, 
excepting Pterocolus, the type of the Pterocolinz, are recognized among 
our fossils, but they include a mere fraction of the fossils, which embrace, 
besides a new generic form of Rhynchitinz, an entirely new subfamily of 
Rhynchitidze with two tribes, seven genera, and thirteen species, about 
equally divided between the two tribes. The total number of fossil species in 
America is therefore fully two-thirds that of the existing forms, a proportion 
which altogether surpasses that found in any other family of insects. Nor 
is there any other family of fossil insects where it has been found necessary 
to establish a distinct subfamily group for an entire series of mew forms. 
The abundance and variety of Rhynchitide may therefore be looked upon 
as the most striking feature in the Tertiary’ Rhynchophorous fauna of North 
America. Of the twenty species found in our Tertiaries, three quarters are 
found exclusively at Florissant. 
Subfamily RHYNCHITIN A. 
Each of the three genera of Rhynchitinze now found in North America 
appears to be represented in our Tertiaries, two of them by a single species 
each at Florissant, Eugnamptus by two species at Green river; and besides 
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