STAPHYLIX1DJS. 51 



scarcely tapering, the last segment broadly rounded, the surface smooth or 

 with the faintest possible shallow punctuation and unprovided with hairs. 



Length, !).;"> mm.: breadth, 2.1 mm. 



Florissant, Colorado; one specimen, Xo. 13678. 



LKISTOTROPIIUS Perty. 



North America possesses two living species of this genus, most of 

 whose other species, not numerous, occur in Europe. A single fossil species 

 has been found in Utah. 



LEISTOTROPHUS PATKIARCHICUS. 



Leistotrophus //.///v'.ov///n/.v Scudd., Bull. U. 8. (icol. (ioogr. Surv. Terr., II, 78-79 

 (ls7ti); Tt-rt. In*. N. A.. ;>i>7. pi. 5. tig. 11:2 (LSHM). 



White River, Utah. 



STAPHYLIXUS Linne. 



This genus has numerous species all over the world, of which about 

 twenty occur in the United States. Fossil species are by no means unknown, 

 nine having been described from Aix, Oeningen, and Florissant, while the 

 genus has been recognized in such different deposits as Senigaglia in Italy, 

 Sicilian amber, Baltic amber, Rott on the Rhine, and the Isle of Wight, 

 leading us to presume several additional species, all in the early Tertiaries. 



STAPHYLINUS LESLEYI sp. nov. 

 PI. VI. tigs. <3, 7. 



This most abundant species of the genus and one of the commonest of 

 the family at Florissant resembles most X. i-ii/i/Kiiioptcnt* Grav., but is scarcely 

 so large and has shorter and stouter antennae, and slenderer less densely 

 spinous tibia?. The head is subtriangular, the basal third with parallel sides, 

 in front of which it tapers considerably; the posterior margin is truncate, 

 but with rounded angles, and the head is a little longer than broad, includ- 

 ing the sharply pointed longitudinally channeled mandibles: the surface is 

 very delicately granulate. The antenna; are about as long as the elytra 

 and are well represented in fig. 7, though the extreme base of the first joint 

 does not appear. The pronotum is slightly broader than the head and of 

 the same length as it, fig. 6 showing it a little too short; it is nearly quad- 

 rate, of about equal length and breadth, with slightly convex sides and 



