Staphylinidcs of the Amazon Valley. 119 



Mas: abtlomiue seOTiento sexto ventral! medio basin 

 vei'sus fovea transversa setigera ornato, segmento 7° apice 

 medio, late minus profunde emarginato ; tarsis anticis 

 simplicibus. 



Antennre moderately long, blackish, tlie last three joints 

 3"ellow ; 3rd joint twice as long as 2nd, 4tii 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 seta? 

 rather long, underside black and impunctate. Thorax 

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

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

 Avith 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 som.e long, fine hairs; 

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

 maro:iu with a broad shallow notch or emaro-iuation. The 

 redeao'us 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 a?deagus is so different as to 

 suggest that the tw^o insects may possibly have to be re- 

 ferred to distinct genera. 



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

 articulo ultimo ferrugineo, elytris cyaneis, tasciatim 

 cinereo-pubescentibus; abdominis segmentis apicalibus 

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



Mas latet. 



Antenna3 moderately long, black, Avith the apical joint 

 reddish. Mandibles and palpi })itchy. Head shining 

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



