STAPH YLINID^. 75 



Bledius adamus. 



Bledim adarmcs Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., IV, 762 (1878); Tert. 

 Ins. N. A., 504, pi. 8, %. 10 (1890). 



This species, though poorly preserved, would appear to be allied to the 

 last two species, but has head, thorax, elytra, and abdomen of equal breadth; 

 the head appears to be faintly marked with a rather coarse transverse comb- 

 ing, while the thorax and elytra are indistinctly and minutely granulated, 

 which may possibly be traced on the abdomen. It is perhaps nearer the 

 sem/ferrugineus group than anv other. 



Green River, Wyoming. 



PLATYSTETHUS Mannerheim. 



This genus has a moderate number of species, nearly all of which are 

 found in the north temperate regions of the Old World. North America 

 has but a single living species, but two occur in the Oligocene of Colorado. 



The two species placed here are remarkable for their close resemblance 

 to our American species in the surface structure of the upper side of the 

 body, and they agree well also in the more important features. They both 

 differ, however, in their shorter antennae, and each has certain peculiar 

 features of its own; in general, however, their affinities with a living type 

 is more marked than in any other group of Staphylinidae. 



Platystethus carcabeus sp. nov. 



PI. IX, fig. 1. 



Body piceous tln-oughout, excepting the prothorax, which is dark tes- 

 taceous. Head rounded, transverse, slightly broader than long, the surface 

 apparently with tine transverse rugae, xintennse shorter than in our com- 

 mon P. americanus Er. (which it closely resembles in size, form, and general 

 jiroportions, as well as in minor characters), scarcely reaching beyond the 

 middle of the prothorax, of exactly the same structure as in our species. 

 Thorax fully as long as the head and somewhat broader than it, transversely 

 quadrate; its exact form can not be determined, but it would appear to be 

 broader posteriorly than in our modern species; it has a distinct median 

 stria, deeper than in the living form, and, like it, is sparsely punctate, tlie 

 puncta giving rise to delicate hairs, which are only half as long as in P. 



