Casey — Observations on the Staphylinidae. 363 



ticularly its entire facies, indicate subtribal isolation at 

 least. 



Platyprosopi. — The very remarkable genus Platyprosopus, 

 of the southern parts of the palaearctic province, is the only 

 representative of this subtribe at present known. Its species 

 are of large size, parallel and convex form, with the neck 

 extremely wide and only feebly delimited from the head by 

 shallow lateral impression of the occiput. The head behind 

 the antennae is shorter than wide, rounded at the sides, which 

 are not longitudinally modified behind the eyes ; the latter are 

 well developed in point of size and rather convex, but appar- 

 ently unique, perhaps in the entire Staphylinidae, in having the 

 facets wholly obsolete except in very limited number around 

 the anterior part, the rest of the surf ace being densely opaque, 

 evenly convex and with fine scattered punctules like those of 

 the other parts of the cephalic surface. The antennae are 

 more slender, elongate, loose and filiform than usual in 

 the Xantholinini and have the outer joints elongate, obconictil 

 and compressed, the basal joint about as long as the next two 

 combined. The labrum is short, transversely truncate, ap- 

 parently with a feebly projecting median lobe, the mandibles 

 large, arcuate, convex externally, with an acute edge toward 

 base, the palpi short and thick, the three outer joints of the 

 maxillary subequal in length, the last cylindric, obtuse at 

 tip; gular sutures short, converging posteriorly but still 

 narrowly separated where they attain a median tumorosity at 

 the base of the head. The prothorax is wider than \ou^, 

 rather wider than the head, wider apically than basally, the 

 sides evenly arcuate, the basal angles broadly rounded, the 

 apical not rounded, the surface not strigilate but having very 

 minute and irregularly scattered nude punctules throughout, 

 the lateral edges more strongly beaded than in any other 

 genus; hypomera rapidly descending; middle coxae contig- 

 uous, large, extending to the sides of the body. The legs 

 are long and rather thick, the tarsi elongate, with the basal 

 joint of the posterior longer than the next two combined, the 

 anterior strongly dilated and twisted. The elytra have the 

 suture fine and normal, without contiguous beading, and, afc 



