STAPHYLINID.-E 213 



terior, consisting of only about three separated facets; antennae not as 

 long as the head and prothorax, gradually and distinctly incrassate 

 distally, the second joint almost as long as the first and as long as the 

 next two, third one-half longer than wide, constricted at base, fourth 

 slightly, the tenth two-thirds, wider than long, the last obtuse, not as 

 long as the two preceding; prothorax somewhat longer than wide, widest 

 at apical fourth, where the sides are narrowly rounded, thence distinctly 

 converging and nearly straight to the obtuse and blunt basal angles, 

 the surface broadly, very feebly impressed along the middle except at 

 apex and base; elytra short, at base as wide as the base, at apex not quite 

 as wide as the widest part, of the prothorax, the suture two-thirds as 

 long as the latter; abdomen at base not quite as wide as the elytra, but, 

 at apex, distinctly wider than the latter, the sides evenly diverging and 

 straight, the fifth tergite one-half longer than the fourth, with the basal 

 impression deep. Length (rather contracted) 1.6 mm.; width 0.3 mm. 

 Vancouver Island (Victoria), Wickham. 



Distinguishable from brevipes by the relatively larger head and 

 prothorax, shorter and less parallel abdomen and different coloration. 



Thinusa Csy. 



This will probably prove to be a tolerably large genus; it is con- 

 fined to the seabeachesof the Pacific coast. It is very closely allied 

 to the European Actosus, to which it might perhaps w r ith some 

 propriety be attached as a subgenus. It agrees with Aclosus in 

 the structure of the abdomen, the fifth tergite not being impressed 

 as it is in Amblopusa, in its well developed eyes, spinose external 

 edge of the middle tibiae and in having the tarsal claws abruptly 

 bent at a nearly right angle at base; but the hypomera or inflexed 

 sides of the pronotum are less vertical in plane or slightly inflexed 

 and are narrower and more parallel, not being anteriorly so dilated 

 as they are in Actosus. The following are some species hitherto 

 undescribed : 



Thinusa divergens n. sp. Moderately slender and convex, parallel, 

 blackish-piceous, the head nearly, the abdomen above and beneath deep, 

 black, the under surface and legs pale brown, the elytra feebly pallescent 

 at base; surface dull, the reticulation fine and very strong, much larger 

 though feebler on the shining abdomen; punctures of the head well 

 separated, shallow, parted along the middle, of the pronotum and elytra 

 close but obscure, of the abdomen fine, rather sparse, nowhere asperate; 

 pubescence pale, rather long, very coarse and bristling; head slightly 

 wider than long, not quite as wide as the prothorax, parallel and feebly 

 arcuate at the sides, the eyes well developed, not prominent, bristling 

 with erect setae and at a little less than their own length from the base; 

 antennae blackish, paler basally, one-half longer than the head, the basal 



