STAPHYLINID^E 205 



moderately converging and arcuate; antennae very pale ochreous through- 

 out, short, gradually and distinctly incrassate, the second joint much 

 shorter than the first and distinctly longer and thicker than the third, 

 fourth wider than long, the tenth more than twice as wide as long, the 

 last obtusely ogival and as long as the two preceding; prothorax nearly 

 three-fourths wider than long, widest near anterior third, where the sides 

 are rather prominently rounded, thence distinctly converging, becoming 

 straight, to the obtuse but well defined basal angles, the transverse 

 ante-basal impression barely traceable ; elytra evidently shorter than wide, 

 with the sides just visibly diverging and the humeri only very slightly 

 exposed at base, only as wide as the anterior part of the prothorax, the 

 suture two-thirds longer, the apical sinuses rather small and not deep; 

 abdomen evidently narrower than the elytra, parallel, the first three 

 impressions deep, the fourth tergite also impressed at base but more 

 feebly; mesosternal process very short, rather obtuse, the metasternal 

 projection unusually large, extending to the middle of the coxae, its very 

 acute apex separated from the process by a moderate though very deep 

 interval. Length 1.4 mm.; width 0.3 mm. California (Hoopa Valley, 

 Humboldt Co.). 



This species is at least subgenerically different from the two pre- 

 ceding, as shown by its flatter surface, the relatively more developed 

 basal joint of the differently colored antennae, by the more promi- 

 nent eyes, quite different mesosternal structure and in having the 

 fourth tergite impressed at base, though much more feebly than the 

 first three; the abdomen is just visibly and gradually pallescent 

 basally in the single type, which appears to be a female. 



Subgenus Dianusa Csy. 



The prothorax is here broader than in the preceding and some- 

 times inflated at the sides, with the head relatively less developed, 

 giving a very different habitus; but the general structural characters 

 are nearly the same, so that the propriety of reducing the genus to 

 the status of a subgenus appears to be sufficiently evident. Besides 

 the type Dianusa pasadence Csy., the following should be made 

 known : 



Eucryptusa (Dianusa) bakeri n. sp. Oblong, parallel, moderately 

 convex, rather shining, rufo-piceous, the head darker, the elytra notably 

 paler, the abdomen black, gradually pallescent basally and with the tip 

 flavate, the legs very pale; punctures of the head very minute, sparse 

 and feeble, of the pronotum and elytra fine, sparse and only slightly 

 asperate, of the abdomen also feebly asperate, fine and still sparser; 

 pubescence coarse, pale, not erect; head small, much wider than long, 

 parallel, barely two-thirds as wide as the prothorax, the eyes rather small 



