Casey — Observations on the Staphylinidae. 293 



closed sinus feebly lobed toward the middle, the lobe bearing two fine, 

 aciculate and very approximate processes extending posteriorly half way 

 to the line of the apices of the principal processes, the adjoining surface 

 with two oblique smooth elliptical tumors, similar to those of the fifth 

 tergite, and, between each of these and the base of the large processes, 

 a small setigerous asperity; female with the sixth tergite broadly 

 roundel. Length 1.3-1.6 mm.; width 0.63-0.78 mm. Colorado 



(Boulder Co.) montieola n. sp. 



Form more slender and parallel, distinctly depressed, the elytra flat; entire 

 surface micro-reticulate, the abdomen very feebly so toward base, the 

 elytra strongly; head darlier, the prothorax rather pale, rufo-piceous, 

 the antennae darfe flavate toward base, more slender than in montieola 

 and with the ninth and tenth joints similar and slightly transverse like 

 the preceding joints; elytra very pale flavate, the outer apical angles 

 rather abruptly piceous-black; abdomen pale and slightly more ruf j- 

 flivate, the fourth tergite black and the two adjoining piceous; legs 

 pale flavate; head moderate, with some coarse scattered punctures at 

 each side of the front; prothorax but very slightly wider than the head, 

 nearly three -fourths wider than long, the sides subparallel and strongly 

 arcuate, the base arcuate and finely reflexed as usual, punctured as in 

 the preceding species; elytra two-fifths wider and longer than the pro- 

 thorax, transverse, the humeri somewhat well exposed, rounded, the 

 punctures very flue and sparse, disposed as usual ; abdomen but slightly 

 narrower than the elytra, parallel and straight at the sides, narrowed 

 only slightly at apex. Male with four small, subequal and equidistant 

 asperities near the tip of the fifth tergite in median third, the sixth with 

 two long, very slender, acutely pointed and feebly arcuate porrect pro- 

 cesses, widely separated and slightly curved inward, much more slender 

 than in montieola, the bottom of the inclosed sinus just concealed in the 

 only males at hand, but evidently without porrect processes of any de- 

 cided prominence. Length 1.5 mm.; width 0.63 mm. British Colum- 

 bia (Kamloops and Glenora) , — H. F. Wickham pacifica n. sp. 



5 — Antennal joints five to ten as long as wide or nearly so, sometimes 



slightly elongate 6 



Antennal joints five to ten always distinctly transverse, forming a usually 

 stouter and more compact club ; species always very small in size .... IS 



6 — Prothorax strongly transverse, almost as wide as the base of the elytra. 



Body stout, fusiform, moderately convex, polisbed, the head and prono- 

 tum very obsoletely micro-reticalate, the latter almost completely smooth ; 

 head blackish-piceous, the antennae and legs pale ; prothorax pale 

 luteous, broadly infuraate toward the middle; elytra whitish-flavate, 

 not distinctly darker at the outer apical angles; abdomen pale flavate, 

 the median part of the fourth tergite black, the neighboring surface 

 infumaie; head with very few coarse punctures toward the eyes, the 

 antennae rather stout, with joints five to ten slightly wider than long, 

 and just visibly increasing in width but virtually forming the paralle 

 club of the remaining species, the fourth joint shorter than wide; 

 eyes small; prothorax much wider than the head, fully three-fourths 

 wider than long, the sides subparallel, broadly rounded, the base 

 rather strongly arcuate, the post-median pair of punctures strong; 



