16 TERTIARY COLEOPTERA OF NORTH AMERICA. 



Dedicated to the honored memory of President Thomas Jefferson, one 

 of the earliest writers on American palaeontology. 



CALOSOMA Weber. 



This genns is at present less numerous in species than the preceding, 

 but has nmch the same range. Over twenty-five species are recorded from 

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

 early and middle Tertiaries than are those of Carabus, for no less than 

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

 Rhine, besides the one frojn Florissant here recorded. 



Calosoma emmonsii sp. nov. 

 PI. I, fig. T. 



Represented by an excellently preserved elytron, with subparallel sides 

 and eighteen strife, of wliich fourteen are equidistant, equally and gently 

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

 only distinct on the apical half of the elytron. The interspaces are gently 

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

 generalh^ 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 fove?e 

 whatever can be seen. The species is nearest C. willcoxi of any of our 

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

 the fovese are very slight. It agrees still better with the fossil species C. 

 escheri and C. deplanatum Heer from the Miocene of Oeningen, but both of 

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

 no sign of punctures appears. 



Length of elytron, 13 mm.; breadth, 4.5 mm. 



Florissant, Colorado; one specimen, Nos. 20 and 71. 



The species is named for my honored instructor, the late Dr. Ebenezer 

 Emmons. 



ELAPHRUS Fabricius. 



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

 genus, excepting one which has been indicated fi-om Oeningen. 



