StaphylinidcB of the Amazon Vallcij. 295 



Para ; a single female captured by Mr. Rogers. 



Obs. — The resemblance of this species to S. angustatus 

 is at first extreme ; not only is the general form and out- 

 line similar, but the colours of the elytra are similarly 

 disposed ; nevertheless, the two species are very different 

 when compared. S. marginatus has the antennre very 

 much longer, the eyes larger, the thorax more elongate, 

 and the sculpture coarser and less dense. .S'. marginatus 

 is closely allied to S. strictus, but has the sculpture coarser, 

 less dense, and therefore more distinct ; the elytra rather 

 longer, and the colours differently disposed, and the in- 

 termediate joints of the antenna rather more elongate. 



7. Sunius brevis,n. sp. Brevior, latiusculus, parallelus, 

 testaceus, capite thoraceque rufescentibus, elytris macula 

 laterali nigra ; opacus, dense punctatus ; capite subqua- 

 drato, oculis prominulis ; thorace transverso. Long. corp. 

 11 lin. 



Antennje pale yellow, rather slender, a little shorter than 

 head and thorax ; 1st joint elongate, as long as the three 

 following together, 3rd a little longer than 2nd ; the joints 

 from 4 — 10 slightly thickened, the 10th being distinctly 

 broader and shorter than the 4th, but not so broad as long ; 

 11th joint rather stout, and a good deal longer than 10th. 

 Labrum large, oblique on each side, so as to be prominent 

 in the middle, the most projecting part Avith a slight notch. 

 Mandibles moderately long; the left with one, the right 

 with two teeth. Head broad, quite as broad as the elytra ; 

 the eyes large and prominent, placed in the middle of the 

 sides, the vertex appearing eraarginate in front of the neck ; 

 the hind angles about right angles, and a little rounded ; 

 the surface dull, densely punctiu-ed with large but indis- 

 tinct punctures, the interstices of which are extremely fine. 

 Thorax about as broad as the elytra, distinctly transverse ; 

 the front rounded, the sides a little narrowed behind; the 

 surface densely punctured, in a similar manner to the 

 head. Elytra yellow, paler than the head and thorax; the 

 side of each with an ill-defined spot, distinctly longer than 

 the thorax, rather closely punctured. Hind body broad 

 and short, very finely punctured. Legs pale yellow, rather 

 short. 



In the male the hind margin of the ventral plate of the 

 6 th segment of the hind body is slightly emarginate on 



