Stapliylinidce of the Amazon Vallei/. 375 



Pal[)i elongate, very pale yellow. Head with the eyes 

 large, rather smaller than the elytra, distinctly excavate ; 

 at the bottom of the excavation with a smooth, carina-like 

 space. Thorax much longer than broad, subcylindric, bvit 

 distinctly narroAved towards the front, and a little towards 

 the base ; shining brassy, with fine, pale hairs ; coarsely, 

 deeply and rather closely punctured. Elytra quite as long 

 as the thorax, with the shoulders well marked and pro- 

 minent ; coarsely, deeply and closely punctured, shining 

 brassy, with a fine, pale, scanty pubescence. Hind body 

 cylindrical, not margined, shining, sparingly, moderately 

 coarsely ]:)unctured, with a fine, pale, elongate pubescence. 

 Legs yellow, rather long ; 4th joint of tarsi bilobcd, the 

 lobes rather long and narrow. 



The male characters are extraordinary: the hind legs 

 are deformed ; the femora are incrassate, the loAver margin 

 thickened near the middle, abi-uptly contracted near the 

 base ; the tibiro are also thickened, and fui-nished near the 

 middle with an angular prominence on their inner face, 

 and below this prominence the inner face is partly sliced 

 off; the basal joint of the tarsus is also distinctly dilated. 

 On the underside of the hind body the basal segment has 

 the hind margin thickened in the middle, but much emar- 

 ginate, so as to form a broad notch, with rather prominent 

 edges ; the next segment has a smaller but shining notch, 

 the 4th and 5th segments are also shining in the middle, 

 in front of the hind margin ; the 6th is broadly emarginate, 

 and the 7th is emarginate at the extremity, the emargination 

 being continued forwards as a narrow, deep fissure. 



Tapajos ; one male, two female individuals. 



22. Stenus Bafesi, n. sp. Plumbeo-niger, breviter 

 albido-pubescens, dense pimctatus ; antennis palpisque tes- 

 taceis, illis apice infuscatis ; pedibus fuscis, tibiarum basi 

 testaceo; capite coleopteris multo angustiore, bisulcato, 

 crebre punctato; prothorace macula medio lajvi ; eljtris 

 thorace longioribus, dense fortiterque punctatis ; abdo- 

 mine elongato-conico, dense punctato. Long. corp. fere 

 2 lin. 



Antennffi moderately long, and rather stout, dark yellow ; 

 the club, which is long in pro]3ortion to the other part, more 

 obscure. Head rather small, much narrower than the 

 elytra, not excavate, but with a small space on the middle 

 elevated, and a depression on either side of this; rather 



