62 TERTIARY COLEOPTERA OF NORTH AMERICA. 



appear to belong. J have therefore placed it in the genus to which most of 

 the Florissant Xantholini are referred, until more material may give us better 

 means for judgment. It should possibly be placed in Othius. 



The head is quadrate, of about ecj^ual length and breadth, with 

 scarcely rounded posterior angles, the surface feebly and shallowly 

 punctate, with scattered short hairs. Antennae poorly preserved but 

 evidently geniculate, reaching back nearly to the middle of the thorax 

 (which is not far, both head and thorax being so short), enlarging a little 

 apically, the terminal joints scarcely broader than long and the last 

 one subglobose. Thorax quadrate, scarcely so long as broad, with 

 straight and almost parallel sides, scarcely narrowing from base to apex, 

 where it is scarcely broader than the head, shallowly punctate and with 

 short scattered hairs. Legs rather short, the tibise very slender. Elytra 

 apparently somewhat longer but scarcely broader than the thorax and 

 apparently with the same structure. Abdomen scarcely narrower than the 

 elytra, with straight and parallel sides, the apex bluntly rounded, the surface 

 faintly and minutely punctate. 



Length, 5.5 mm.; breadth, 0.9 mm. 



Florissant, Colorado; one specimen. No. 12767. 



LATHROBIUM Gravenhorst. 



A genus rich in species, almost exclusively found in north temperate 

 regions, but with a few elsewhere, and abundantly supplied in North America. 

 Only a few fossil species are known ; one occurs in the Pleistocene of Canada; 

 a different species is found at each of the older Tertiary localities of Aix, 

 Oeningen, and Wyoming, and the genus has been recognized in amber. 



Lathrobium abscessum. 



Lathrohium abscessum Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., II, 791 (1876); 

 Tert. Ins. N. A., 505-506, pi. 8, tigs. 15, 21 (1890). 



Green River, Wyoming-. 



Lathrobium interglaciale. 



Lathrobium interglaciale Scudd., Tert. Ins. N. A., 506, pi. 1, fig. 38 (1890); Contr. 

 Canad. Palseont., II, 44 (1892). 



Clay beds of Scarboro, Ontario. 



