StaphylinidoB of the Amazon Valley. 369 



nis, palpis, pedibusqiie pallide flavis ; thorace crebre sat 

 fbrtiter punctato, medio carina, angusta ; elytris thoracis 

 longitudine, crebre fortiter piiuctatis ; abdomine obsolete 

 punctato. Long. corp. 2^ lin. 



Antenna3 pale yellow, elongate and slender, longer than 

 head and thorax ; 3rd joint more than twice as long as 

 2nd, and a good deal longer than 4th. Head about as 

 broad as the elytra; the front not excavate, but a little 

 depressed on either side between the eyes and the middle 

 part, which is shining and impunctate. Thorax a good 

 deal narrower than the elytra, miich longer than broad, 

 cylindric, the sides nearly straight, a little narrowed 

 towards the base and slightly towards the front; mode- 

 rately coarsely and closely punctured, Avith an abbreviated, 

 shining, narrow space along the middle. Elytra about as 

 long as the thorax, rather coarsely punctured, the punctu- 

 ation moderately close ; the shoulders but little prominent. 

 Hind body elongate, the basal segment margined finely, 

 each segment only obscurely constricted at the base ; quite 

 obscurely punctured, with a distinct, silvery, depressed, 

 long pubescence ; its under surface finely and sparingly 

 punctured. Legs very pale yellow, elongate and slender; 

 the lobes of the tarsi broad. 



Tapajos ; a single female. 



O^s. — This species bears an extreme resemblance to 

 S. ventralis, but is undoubtedly distinct ; S. extensus is 

 rather the more slender of the two, and has the thorax 

 more cylindric and distinctly carinated along the middle ; 

 it is best distinguished, however, by the punctuation of 

 the hind body, which is finer than in /S'. ventralis, a differ- 

 ence Avhich is very easily perceived Avhen the undersides 

 are compared. 



14. Stenus genalis, n. sp. (Sect. II. B, Er.) _ Elon- 

 gatus, angustus, niger, metallescens, antennis, palpis, pedi- 

 busque pallide flavis; fronte plana, thorace cylindrico, 

 dense punctato, fere opaco ; elytris thoracis longitudine, 

 dense fortiterque punctatis ; abdomine crebre fortiterque 

 punctato, fere nudo. Long. corp. 2\ lin. 



Blackish, Avith a leaden-green tinge. Antenna elongate 

 and slender, yellow ; palpi pale yellow. Head broad, quite 

 as broad as the elytra ; the space between the eyes broad, 



TRANS. ENT. SOC. 1876. — rATlT II. (jUNE.) B B 



