Casey — Observations on the Staphylinidae. 215 



densely punctate; pubescence inconspicuous; head lariie, wider than 

 long, broadly arcuito-truncate at base, the sides parallel, the angles 

 narrowly rounded; antennae short, stout, scarcely longer than the 

 head and prothorax, the first three joints rapidly diminishing in 

 length, the outer joints compact and rather strongly transverse; pro- 

 thorax about as wide as the head, slightly transverse, the sides broadly 

 rounded anteriorly, thence feebly convergent and less arcuate to the 

 base, the surface with a very small transverse impression before the 

 middle of the base, the latter moderately arcuate; elytra slightly 

 transverse, about two-fifths wider and longer than the prothorax, the 

 suture feebly and broadly impressed in basal three-fifths; humeri 

 somewhat well exposed, slightly rounded; abdomen parallel, distinctly 

 narrower than the elytra but wider than the prothorax, the sides of the 

 fifth ventral converging posteriorly; legs slender; sixth ventral of the 

 female evenly rounded at tip, the male unknown. Length 1.9 mm.; 

 width 0.42 mm. California (Monterey Co.). [= Tachyusa lat. Csy.]. 



laticeps Csy. 

 Form and coloration nearly similar, the anterior parts and legs rather 

 darker, the abdomen black throughout, almost similarly sculptured, 

 shining; head smaller, but slightly wider than long, similarly arcuato- 

 truncate at base, the antennae nearly similar, but little longer than the 

 head and prothorax, the outer joints still more strongly transverse, 

 compact; prothorax rather more transverse, somewhat wider than the 

 head, the sides much more narrowly rounded anteriorly, thence con- 

 verging and straighter to the base, the short transverse impression be- 

 fore the scutellum similar; elytra similar in form, with the humeri 

 equally exposed, the impression on the suture behind the scutellum 

 very much shorter, oval; abdomennearly similar but somewhat broader, 

 the coarse punctuation of the short, deep, transversely linear basal im- 

 pressions somewhat coarser and closer; sixth ventral of the female 

 broadly, subparabolically rounded at tip, the male not at hand. Length 

 1.75 mm.; width 0.4 mm. California (Los Angeles Co.). 



placidala n. sp. 



These species are apparently rare and 1 have at present 

 before me only a single example of each. 



Euliusa n. gen. 



In general form and f acies this genus resembles Gnypeta and 

 it is undoubtedly closely allied, the intermesocoxal structure 

 being much the same, a short isthmus separating the rather 

 short and in general obtusely truncate free tip of the meso- 

 sternal process from the metasternal projection, but, poste- 

 riorly, there is no trace of the circumambient beaded edge 

 delimiting the acetabula, so well developed and constant in 

 Gnypeta. The sculpture is always very feeble and there is 



