STAPHYLINID^. 69 



Mycetoporus demersus sp. nov. 

 PI. Vm, fig. 6. 



Of the form and size of B. americanus Er., which it closely resembles. 

 Head rounded triangular, of equal length and breadth, fusco-testaceous, 

 smooth and shining. Antennae reaching a little farther back than the hinder 

 edge of the thorax, and therefore considerably shorter than in B. americanus, 

 imperfectly preserved, but so far as can be seen of precisely the same gen- 

 eral form as there, except in being somewhat slenderer, and with tJie same 

 form of such individual joints as can be made out (notably the tifth or 

 sixth and the last), except in their greater brevity, apparently uniformly 

 luteous. Legs rather short. Thorax slightly longer than the head, about 

 half as wide again as long, tapering, in front of the same width as the head, 

 scarcely broader behind than the base of the elytra, smooth, shining, and 

 luteous. Elytra slightly shorter than the head and thorax together, slightly 

 broader than long, smooth, shining, fusco-testaceous, with sutural, lateral, 

 and discal striae., having faint signs here and there of delicate setse in them. 

 Abdomen as broad at base as the elytra, about as long as the rest of the 

 body, tapering pretty uniformly to a dull point, luteous or luteo-testaceous, 

 the surface smooth and shining, apparently with no pubescence, but the 

 apices of the joints with a few fine setse which become coarse and longer 

 on the terminal joints, especially at the sides. 



Length, 3.75 mm.; breadth, 1 mm.; length of antennae, L2 mm. 



Florissant, Colorado; one specimen. No. 14737, obtained by Miss C. 

 H. Blatchford. 



OXYPORUS Fabricius. 



This genus, with a moderate number of species, is almost exclusively 

 Nortli American, but a couple of species occur in Europe. In the older 

 Tertiaries of Europe four species occur at Oeningen, Rott, and in amber. 

 In America a single fossil is known, from the Pleistocene of Canada. 



OxYPORUS STIRIACUS. 



Oxypcmm stiriacvs Scudd., Tert. Ins. N. A., 505, pi. 1, fig. 36 (1890); Contr. Canad. 

 Falfeont, II, U (1892). 



Clay beds of Scarboro, Ontario. 



