StaphylinidcB of the AmazoJi Valley. 119 



Mas : abclomine segmento sexto ventrali medio basin 

 versus fovea transversa setigera ornato, segmento 7° apice 

 medio, late minus profunda emarginato ; tarsis anticis 

 simplicibus. 



AntennjE moderately long, blackish, the last three joints 

 yellow ; 3rd joint twice as long as 2nd, 4th a little longer 

 than the 2nd. Mandibles and palpi pitchy. Head above 

 blue, slightly broader than the thorax, very coarsely 

 punctured, with a triangular space behind the labrum, and 

 a small central one, impunctate; pubescence and sette 

 rather long, underside black and impunctate. Thorax 

 bluish above, a little longer than broad, a little sinuate at 

 the sides, a little narrowed behind, very coarsely punctured, 

 with a medial line impunctate ; pubescence long, scanty 

 and fine, grey. Scutellum dull, finely punctured and 

 pubescent. Elytra longer than the thorax, moderately 

 closely and not finely punctured, at the base and apex 

 with grey pubescence. Hind body narrowed towards the 

 extremity, black, with the 6th and 7th segments bright 

 yellow; 2nd segment impunctate, 3 — 5 rather sparingly 

 punctured, 3rd with a grey pubescence. Legs black, 

 tarsi pitchy. 



In the male, on the underside, the 6th segment of the 

 hind body has in the middle, near the base, a short trans- 

 verse impression or fovea, bearing some long, fine hairs; 

 the 7th segment is furnished in the middle of the hind 

 margin with a broad shallow notch or eraargination. The 

 jedeagus is small, and furnished with a ligula shorter than 

 the body of the organ, and so slender as to be easily over- 

 looked. The front tarsi are simple. 



St. Paulo; one i specimen. 



Obs. — Notwithstanding the extreme resemblance of this 

 species to P. tricolor, the redeagus is so different as to 

 suggest that the two insects may possibly have to be re- 

 ferred to distinct genera. 



4. Plociopterus affinis, n. sp. Niger, nitidus, antennis 

 articulo ultimo ferrugineo, elytris cyaneis, fasciatim 

 cinereo-pubescentibus; abdominis segmentis apicalibus 

 rufo-testaceis, stylis analibus nigris. Long. corp. 6^ lin. 



Mas latet. 



Antennre moderately long, black, with the apical joint 

 reddish. Mandibles and palpi pitchy. Head shining 

 black, coarsely punctured, with a large space on the middle 



