Staphylinidce of tlie Amazon Valley. 291 



thorax, slender and scarcely thickened towards the apex ; 

 2nd joint half as long as 1st; 3rd distinctly longer than 

 2nd, slightly longer than 4tli ; 4 — 7 scarcely differing 

 fi'om one another, 7 — 10 each very slightly shorter but 

 scarcely stouter than the predecessor, 11th one and a half 

 times the length of 10th. Head scarcely broader than 

 thorax ; eyes rather large and prominent, blackish or 

 pitchy, quite dull ; punctuation dense, very indistinct, 

 consisting of large umbilicated punctures, separated by 

 very fine interstices, with a fine pale pubescence and out- 

 standing black seta?. Thorax about as broad as the elytra, 

 a good deal narrowed behind, but broad at the base ; 

 colour, sculpture and pubescence similar to those of the 

 head. Elyti-a only slightly longer than the thorax, pitchy, 

 with a narrow band at the apex yellow ; densely punctured, 

 with rather fine granular punctures, quite dull. Hind 

 body elongate and narrow, only a very little narrower at 

 the extremity than at the base, dull, densely and finely 

 punctured, with a fine but very distinct ashy pubescence. 

 Legs very pale yellow. 



In the male the 6th segment of the hind body has an 

 ill-defined channel along the middle, which reaches neither 

 the base nor the hind margin ; the latter is hardly per- 

 ceptibly emarginate, but is furnished in the middle with a 

 row of very short, fine black sette ; the hinder part of the 

 ventral plate of the next segment bears a rather deep 

 excision. 



Tapajos ; one male and three female individuals. 



Ohs. I. — Rather closely allied to our European S. 

 diver sus ; this species is readily distinguished, however, 

 therefi'om by its duller surface, longer antenna), broader 

 thorax and the narrower band of the elytra. 



Obs. II. — Besides these individuals, I have from the 

 same locality two specimens ( $ and $ ) which do not 

 appear to me to differ from them in any material respect 

 except that of colour. These two individuals are entirely 

 of a pale-fulvous colour, and appear at first sight, there- 

 fore, very different from the dark individuals above 

 described ; but I consider them merely a variety of the 

 species. 



2. Sunius vittahis,n. sp. Elongatus, angustulus, paral- 

 lelus, dense punctatus, antennis, palpis, pedibusque fere 

 albidis, niger ; elytrorum apice vittisque duabus longitu- 

 dinalibus testaceis. Long. corp. 2 lin. 



u 2 



