Casey — Observations on the Staphylinidae. 349 



abdomen wider and with the impression of the third tergite 

 feeble, becoming wholly obsolete toward the sides of the 

 plate. 



Amenusa n. gen. 



In its subdeppessed, parallel form and dense dull integu- 

 ments, the general aspect of this distinct genus is not unlike 

 Placusa^ but it differs in having the middle coxae rather 

 widely separated, the mesosternal process very short, truncate 

 and virtually abutting against the very long broad metaster- 

 nal projection. The infra-lateral carinae of the head seem 

 to be entire but are extremely feeble or obsolescent anteriorly 

 and the hind tarsi are short, with the first four joints short 

 and subequal, the fifth long, almost equaling the four basal 

 together; the claws are long, slender and feebly arcuate. 

 The single known species may be thus briefly described : — 



Form rather slender, parallel, feebly convex, alataceoas, black or blackish, 

 the elytra paler, piceous ; legs pale, the antennae blackish, gradually 

 paler toward base; integuments densely micro-reticalate, the abdomen 

 minutely, faintly strigilate in transverse wavy lines; punctures very 

 fine, close-set but indistinct except on the elytra, very fine on the abdo- 

 men and sparse, the latter more shining; pubescence short and incon- 

 spicuous; head wider than long, the eyes rather well developed, promi- 

 nent, the sides strongly converging and broadly arcuate behind them 

 to the neck; antennae fully attaining basal third of the elytra, gradu- 

 ally and moderately incrassate distally, the elongate second and third 

 joints subequal, the subapical joints transverse, the eleventh subpyrl- 

 form; prothorax transverse, a fourth wider than the head and one- 

 half wider than long, widest at apical third, the sides broadly arcuate, 

 feebly converging and straight toward base, the angles obtuse but not 

 at all rounded, the surface not distinctly impressed ; elytra only just 

 visibly wider but one-half longer than the prothorax, parallel, very 

 feebly impressed behind the scutellum, the humeri somewhat exposed 

 at base ; abdomen obviously narrower than the elytra, the first three 

 tergites narrowly and subequally impressed at base. Length 2.7 mm. ; 

 width 0.67 mm. California (Pomona, — Los Angeles Co.), — H. C. 

 Fall angnstnla n. sp. 



The male has no discal marks on the apical tergites but 

 the sixth is broadly truncate at tip, the edge throughout 

 closely pectinate, the teeth triangular, the extreme lateral 

 tooth on each side more isolated, longer and more slender. 



