STAPHYLINID.E. 99 



Very readily distinguishable from the preceding by its coloration, 

 apically narrowed prothorax, denser abdominal sculpture and pubes- 

 sence and still more slender antennae. 



Colposura Csy. 



This subgenus of Amischa is distinguished by the fine transverse 

 raised line of the metasternum, which also surrounds the acetabula 

 in the manner so general throughout the Athetid group. Its type 

 is Colposura prcdonga Csy. The following is another species: 



Amischa (Colposura) tersa n. sp. Very slender and only feebly convex, 

 slightly shining, coarsely and strongly micro-reticulate, the punctures ex- 

 tremely fine, not very dense, the abdomen as usual in Amischa, not reticu- 

 late, but with imbricate sculpture, the punctures minute and not dense; 

 vestiture very short; color pale flavo-testaceous, the head piceous basally 

 and the abdomen indefinitely clouded except basally and apically, the legs 

 pale; head triangular, with rounded sides, slightly wider than long, flattened 

 above, the eyes not prominent, anterior, the carinae wanting; antennae pale, 

 only feebly incrassate, short as usual, the basal joint about as long as the 

 second though a little stouter, the second longer than the third, both obconic, 

 the outer joints slightly wider than long; prothorax moderately transverse, 

 a fourth wider than the head, as wide as the elytra, parallel, with feebly ar- 

 cuate sides and broadly rounded base, the basal impression distinct; elytra 

 short, the suture not quite so long as the prothorax, the outer sinus at the 

 apices unusually feeble; abdomen long, parallel, about as wide as the elytra. 

 Length 2.2 mm.; width 0.3 mm. Colorado (Colorado Springs), Wickham. 



Closely allied to prcelonga but differing in the more obtusely 

 rounded basal angles of the head, broader prothorax, the latter less 

 prominent medially at apex and in the shorter elytra; in prcelonga 

 the elytra are evidently longer than the prothorax. The neck in 

 this genus is unusually narrow for the Athetids, being, in pr<zlonga> 

 only about a third as wide as the head. 



Dimetrota Rey. 



The hypomera are here horizontal, but as before stated of the 

 present section of Athetids, warped, so that a small portion is visible 

 when viewed from the sides. The species are suggestive in some 

 respects of the Acrotona section, but there the hypomera are so 

 strongly inflexed as to be wholly invisible from a lateral viewpoint, 

 Dimetrota is abundantly represented in America, though, as usual 

 in an American extension of European genera, there are many 

 aberrant forms which will probably have to be separated eventually. 



