StapliT/liiiidcB of the Amazon Valley. 369 



nis, palpis, pedibasque pallide flavis ; tliorace crebre sat 

 fbrtiter punctato, medio carina angusta ; elytris thoracis 

 longitudine, crebre fortiter piinctatis ; abdomine obsolete 

 punctato. Long. corp. 2^ lin. 



Antenna 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 

 ]iart, which is shining and impunctate. Thorax a good, 

 deal narrower than the elytra, much 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, mth an abbreviated, 

 shining, narrow space along the middle. Elytra about as 

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

 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 siu'face finely and sparingly 

 punctured. Legs veiy pale yellow, elongate and slender; 

 the lobes of the tarsi broad. 



Tapajos ; a single female. 



Obs. — This species bears an extreme resemblance to 

 S. ventralis, but is imdoubtedly 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 iS*. ventralis, a differ- 

 ence which is very easily perceived Avlien the undersides 

 are comjjared. 



14. Ste7ius genalis, n. sp. (Sect. II. B, Er.) Elon- 

 gatus, angustus, niger, metallescens, antennis, pal})is, pedi- 

 busque pallide flavis ; fronte planTi, tliorace cylindrico, 

 dense punctato, fere opaco ; elytris thoracis longitudine, 

 dense fortiterque punctatis ; abdomine crebre fortiterque 

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



Blackish, with a leaden-green tinge. Antennas elongate 

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

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



TRANS. ENT. SOC. 187G. — PART II. (jUNE.) B B 



