154 TERTIARY RHYNCHOPHOROUS COLEOPTERA, 
LITHOPHTHORUS RUGOSICOLLIS. 
Pl. 11, Fig. 20. 
Although the head is almost perfectly smooth and glistening, with only 
seattered dots of granules behind the rather prominent transverse ridge or 
fold behind the eye, the beak is coarsely rugose, almost as coarsely so as the 
prothorax where the crowded granulations are larger and more prominent 
above than on the sides; a sinuate or bent slender longitudinal ridge tray- 
erses the pronotum near the lower base of the elytra; the latter besides 
the costze have crowded longitudinal series of granulations, and the whole 
under surface of the body appears to be similarly but less conspicuously 
granulate, especially less so on the abdominal segments. 
Length, exclusive of beak, 4°75""; breadth, as preserved ona partially 
side view, 2°5™"; length of beak beyond front of eyes, 1™; breadth of 
same, 0:3™™. 
Florissant, Colorado. One specimen, No. 5251. 
Tribe COSSONINI. 
All the fossil species of this tribe, three in Europe and two in America, 
are referred to the genus Cossonus. The European species come from 
Oeningen and Aix; the American from Florissant and the Roan mountains. 
COSSONUS Clairville. 
The numerous species of this genus are spread all over the globe, but 
America claims much the largest share of them and especially North America. 
In the United States only nine species are known, which are widely dis- 
tributed but mostly in the middle section of the country from Atlantic to 
Pacific. 
To this genus I provisionally refer two fossil species which are cer- 
tainly not congeneric but whose structure is as yet too imperfectly known 
to permit a closer determination. 
Three species from the European Tertiaries have formerly been referred 
to this genus, but have no very close affinities with ours. Two of them, 
the species from Oeningen, C. meriani Heer and C. spielbergiit Heer, are 
