288 PROCEEDINGS OF THE NATIONAL MU8EUM. vol.45. 



Genus STAPHYLINUS Linnaeus. 



STAPHYLINUS VULCAN, new species. 

 Plate 22, fig. 7. 



Preserved in dorsal view. Form elongate, more like that of Ocypus 

 than of StapJiylinus, head suborbicular as in the group containing 

 the recent S. hadipes. Antennae rather short and but shghtly en- 

 larged distally, the first to third joints elongate, the second shorter 

 than either the first or third, the remainder transverse, the last a 

 little longer and rounded at the tip. Eyes not definable as such, 

 but not prominent nor disturbing the contour of the head. Pro- 

 thorax about equal to the head in size, base and apex subequal, 

 sides apparently regularly arcuate each way from about the mid- 

 dle, the angles not well defined but obtuse and not prominent. 

 Elytra about one and a half times as long as the pro thorax, humeri 

 ill-defined, sides somewhat rounded, the pair (as preserved) probably 

 overlapping a Httle along the suture which is not distinctly marked. 

 Abdomen with the sides subparaUel to the anterior margin of the 

 fifth segment, thence tapering to the tip. Terminal processes ob- 

 scure. Legs moderate, the front pair stouter, the tarsus (in this 

 specimen, which is therefore presumably a male) strongly dilated. 

 The sculpture of the insect is not well shown, but appears to have 

 been a subscabrous punctuation. A few well defined hair prints on 

 the cheeks indicate vestiture of a type similar to that now seen on 

 S. hadipes. Length, exclusive of the terminal appendages, 13.50 

 mm.; of the head, 2.20 mm.; of the pro thorax, a little less; of the 

 elytra, 2.65 mm. ; of antenna, from margin of head, 2.75 mm. Width 

 of head, 2.10 mm; of elytra, 2.30 mm.; of the abdomen across the 

 fourth exposed segment, 2.45 mm. 



Type.—€sit. No. 59636, U.S.N.M. 



This insect, known from a single specimen, has the slender form 

 of an Ocypus, but I have preferred to place it in StapJiylinus on 

 account of the shape of the head and the antennal structure, both 

 of these features allying it with S. hadipes, to which it has been com- 

 pared. In the specimens of Ocypus at my command, the antennae 

 are much more slender. It is a somewhat larger insect than Scud- 

 der's S. lesleyi, from these shales, and that species is described as 

 having a subtriangular head, which would put it in a different group. 

 From S. vetulus Scudder, the new species differs in being much 

 smaller and more slender. 



Genus PHILONTHUS Cu. tis. 



PmLONTHUS MARCIDULUS Scudder. 



A specimen with reverse, showing underside and antennae, is 

 assigned here with some doubt. It is a little larger than the meas- 

 urements given by Scudder, reaching the length of 13.75 mm. 



Cat. No. 59648, U.S.N.M. 



