Staphylinidce of the Amazon Valley. 383 



distinct punctures. Thorax about as long as its breadth 

 at the base ; the sides gradually nai-rowed from the front to 

 the base, and not sinuate in front of the hind angles ; the 

 base distinctly curved near the hind angles, so that these 

 are obtuse, the lateral margin strongly raised on its pos- 

 terior half; the surflice coriaceous, but shining, sprinkled 

 with distinct punctures, with a very short indistinct 

 channel on the middle. Elytra slightly longer than the 

 thorax, shining, but distinctly rugulose, and with some 

 rather coarse, but obsolete punctiu'es. Hind body above 

 shining, and with one or two setigerous punctures on each 

 segment ; its under surface with rather coarse, sparing, 

 setigerous punctures; hind portion of the apical segment 

 sparingly punctured, but longitudinally smooth along the 

 middle. 



St. Paulo ; two individuals. 



3. Osorius simplex, n. sp. Cylindrlcus, nitidus, nigro- 

 j)iceus, pedibus rufescentibus ; capite parce sat fortiter 

 punctato, clypeo antice subtruncato, angulis prominulis; 

 prothorace parce punctato, angulis posterioribus obtusis ; 

 elytris subrugulosis et parce obsolete punctatis ; abdomine 

 supra laivigato. Long. corp. 4.3 lin. 



Clypeus almost straight in the middle in front, but with 

 the angles thick and prominent, but not at all spinose. 

 Head shining, rather s})aringly but distinctly punctured, 

 the antennal tubercles well marked, and the eyes distinctly 

 prominent ; the punctures are wanting in front of the 

 vertex, and are wanting about an irregular longitudinal 

 space along the middle. Thorax slightly longer than it is 

 broad at the base, a little narrowed from the front to the 

 base; the surface shining, sprinkled with punctures like the 

 head, indistinctly channelled along the middle; the hind 

 angles distinctly obtuse, but not far from right angles. 

 Elytra a little longer than the thorax, shining, with indis- 

 tinct rugulose impressions and elongate punctures. Hind 

 body shining, rather slender, impunctate above ; on tlie 

 underside the 7th segment bears a large smooth impression 

 in the middle at the extremity, on each side of which it is 

 sparingly sculptured, and furnished with scanty hairs, the 

 punctures quite at the side forming obscure distant ruga^ ; 

 the 6th segment coarsely punctured, the punctures rather 

 close on the middle; the ])receding segments also with 

 coarse pimctures on the middle. 



Ega ; a single male. 



