1C) TKRTIARY I'OLKOPTKRA OK NORTH AMKRICA. 



Dedicated to the honored memory ot President Thomas Jefferson, one 

 of the earliest writers on American palaeontology. 



CALOSOMA Weber. 



Thi-. n'eims is at present less numerous in species than the preceding, 

 bur has much the same range. Over twenty-five species are recorded from 

 North America. The tossil species are, however, more numerous in the 

 early and middle Tertiaries than are those of ( 'arabus, for no less than 

 eleven species are described from Aix, Oeningen, Switzerland, and the 

 Rhine, besides rhe one from Florissant here recorded. 



CALOSOMA K.MMOXSII sp. nov. 

 PI. I. iig. 7. 



Represented hv an excellently preserved elytron, with subparallel sides 

 and eighteen strise, of which fourteen are equidistant, e<mall\ and gently 

 impressed, while the others are crowded together next the outer border, and 

 onlv distinct on the apical half of rhe elytron. The interspaces are gentlv 

 convex and broken by finely impressed lines into quadrate cells which are 

 generally about two-thirds as long as broad, and are in all parts very obscure. 

 The figure on the plate is not magnified enough to show these. No tove:v 

 whatever cai, be seen. The species is nearest (' tnllro.i-/ of any ot our 

 native forms and agrees fairly well with it in size and shape; in that species 

 the tbvea- are very slight. It agrees still better with the fossil species ('. 

 i.'Sclii'i'i and ('. deplanatum Heer from the Miocene of Oeningen, but both of 

 these species are verv much larger and punctato-striate, while in our species 

 no sign of punctures appears. 



Length of elytron, 13 mm.; breadth, 4.f> mm. 



Florissant, Colorado; one specimen, Nos. iM) and 71. 



The species is named lor my honored instructor, the late I >r. Kbenezer 

 Kmmoiis. 



FLAIMIKTS Fabricius. 



The present is the only known fossil species of this north temperate 

 genus, excepting one which has been indicated from ( )euingen. 



