Staphylinid(B of the Amazon Valley. 303 



towards the front and slightly towards the base : blackish in 

 colour (or reddish if immature), coarsely sculptured in a 

 similar manner to the head, the sides towards the front 

 appearing serrate. Elytra rather longer than the thorax, 

 of a shining castaneous colour, with a dark spot on the 

 middle, rather coarsely and deeply but not densely punc- 

 tured. Hind body with the segments sericeous and cori- 

 aceous at the base, the hind portion of each shining and 

 punctured, the punctures rather obsolete but moderately 

 coarse ; beneath entirely with a peculiar silky lustre and 

 very obsoletely punctured. Legs yellow ; the apex of the 

 femora slightly infuscate. 



In the male the ventral plate of the 6th segment is con- 

 siderably shorter than the dorsal plate and is a little 

 emarginate, and the ventral plate of the following segment 

 is broadly but not deeply excised. The aideagus itself is 

 provided at the extremity with a slender elongate ap- 

 pendage, which is quite as long as the body of the organ ; 

 this appendage is sinuate in the middle, and furnished at 

 the apex with an abruptly inflexed additional piece, giving 

 its apex the form of a hook. 



Ega ; three individuals, — two males, one female. 



18. Sunius celatus, n. sp. Elongatus, castaneus, 

 capite thoraceque nigris, illo elongato, labro spinis duabus 

 elongatis armato ; elytris nitidulis, fortiter punctatis, 

 macula media fusca ; antennis tenuibus perelongatis. 

 Long. Corp. 3^ lin. 



In the male the Eedeagus is furnished with an elongate 

 and rather broad strap-like appendage, which is shorter 

 than the body of the organ, a little constricted in the 

 middle and furnished at the extremity with a very small 

 abruptly inflexed additional piece. 



Tapajos ; a single male. 



Ohs. — The single individual before me seems to me to 

 offer no certain character to distinguish it from S. spi- 

 nifer, except the difference in the Eedeagus; as the form 

 and length of the appendage of this organ is quite the 

 same in the two males from Ega, I have thought it advi- 

 sable to consider the Tapajos individual as indicating a 

 different species, though further researches on an addi- 

 tional number of specimens will be necessary before this 

 can be considered to be certainly established. 



19. Sunius insignis, n. sp. Castaneus, nitidulus, an- 



