154 TEKTIAKY KHYNCnOPHOKOUS COLEOPTEKA. 



LiTHOPHTHORUS KUOOSICOLLIS. 

 PI. II, Fig. -20. 



Although the head is ahnost perfectly smooth and glistening, with only 

 scattered dots of granules behind the rather prominent transverse ridge or 

 fold behind the eye, the beak is coarsely rugose, ahnost as coarsely so as the 

 prothorax where the crowdeil granulations are larger and more prominent 

 above than on the sides ; a sinuate or bent slender longitudinal ridge tra^'- 

 ei'ses the pronotum near the lower base of the elytra ; the latter besides 

 the costa' have crowded longitudinal series of granulations, and the whole 

 under surface of the body appears to be similarly ])ut less conspicuously 

 granulate, especially less so on the abdominal segments. 



Length, exclusive of l)eak, 4'75""": lireadth, as preserved on a partially 

 side view, •2'.")'""'; length of beak beyond front of eyes, 1°""; breadth of 

 same, 0-'d'^"\ 



Florissant, Colorado. One specimen. No. 5251. 



Tribe COSSONINI. 



All the fossil species of this tribe, three in Eui'ope 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 onlv nine species are known, wliich are wideh' dis- 

 tribut('(l l)ut mostly in the middle section of the countrv 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, l)ut have no very close affinities with ours. Two of them, 

 the species from Oeningen, (J. iiin-'iuiti Ileer aiul ('. spu-Uitryii Heer, are 



