156 TERTIARY RHYNCHOPHOROUS COLEOPTERA. 
thorax but less pronounced; eyes small, broad oval, less than half as long 
as the breadth of the beak, transverse, set far back ; beak somewhat longer 
than the head, somewhat more than twice as long as broad. Prothorax 
scarcely so long as high, not arched, coarsely and rather faintly punctate. 
Elytra not arched, poorly preserved but apparently shallowly striate, cover- 
ing the pygidium. Femora rather slender, rather longer than the snout. 
Length exclusive of beak, 8:5"; height, 0°75""; length of rostrum, 
Oda 
Florissant, Colorado. One specimen, No. 2311. 
This species resembles in general form, proportions and size our C. 
impressifrons Boh. 
Named in memory of an industrious geologist and paleontologist, the 
late Mr. W. M. Gabb. 
Family SCOLYTID.A5. 
No family of Rhynchophora is so much more poorly represented in 
Tertiary deposits than in the living fauna as the present. This must doubt- 
less be accounted for in large measure by the habits of these insects, living 
as they do beneath the bark of trees, and therefore less exposed than the 
members of the other families to such accidents as would precipitate them 
to the bottom of lakes and ponds. In our own country they form less than 
3 per cent of the Tertiary Rhynchophorous fauna, while in the existing 
fauna they compose more than 15 per cent of the whole. The Platypodinze 
are represented in the European Tertiaries by a couple of amber species 
of Platypus, but are not found in our rocks, while the Scolytines have the 
meager and equal number of five species in the Tertiary deposits of either 
continent. 
Subfamily SCOLYTIN AE. 
Of the three tribes into which the modern American species of this sub- 
family are divided, the least important, the Scolytini, have not been found 
fossil in America, though a species of Seolytus was recognized by Serres at 
Aix, in Provence. On the other hand, the Tomicini, relatively and abso- 
