78 TERTIARY COLEOPTERA OF NORTH AMERICA. 



The species agrees best perhaps witli G. niyrititx Miill., but is not very 

 close to any, differing in the granulated structure- of the body and the 

 absence of any posterior collar-like constriction of the thorax. 



Length of fragment, o.l mm.; of thorax, 1 nun.; of elytra, 1.7:"> nun.; 

 breadth of thorax, 1.1 mm.; of elytra, 1.8f> mm. 



Florissant, Colorado; one specimen, No. 2186. 



GEODROMICUS STIKICIDII. 



(i, iiilrnniii-iix atii'!i-!<1i! Scudd. , Contr. Canacl. Pahtont., II, 43, pi. ~2, fig. 1 (iJS'.i.!). 

 Clay beds of Scarboro, Ontario. 



ARPEDIUM Krichson. 



A widespread genus, with a very limited number of species, of which 

 nearly half a dozen occur in North America. The only fossil known is 

 one from the Canadian Pleistocene, here recorded. 



ARPEDIUM STILLICIDII. 

 Arpi'i/iini, xtiniciiJl! Scudd., Contr. Canad. Palajont.. II, 42-48. pi. '2, fig. -2 (ISHi'). 



f 



Clay beds of Scarboro, Ontario. 



TRIGA Fauvel. 



A North American monotypic genus, which is represented in the earlier 

 Tertiaries by a species from Colorado. 



TRIGA CXENI sp. nov. 

 PI. IX, fig. 5. 



Head orbicular, with barely prominent eyes, about half as broad again 

 as the brief constricted neck, smooth, with distant, exceedingly brief hairs 

 set in minute punctures. Anteiime with only the three or four basal joints 

 preserved, and these imperfectly, but thev indicate nothing- at variance with 

 those of 7'. iiii-i/intHix LeC., unless thev are stouter. Thorax slightly wider 

 than the head, transversely suborbicular, slightly broader than long, trun- 

 cate at apex, but well rounded at base and regularly convex on sides, with 

 a faint median stria, the disk verv sparsely and feebly punctate, the pnncta 

 giving rise t<> moderate hairs. Klytra a little wider, but scarcely longer 



