364 Mr. D. Sharp's Contributions to the 



rather moi*e slender, the tarsi being conspicuously more 

 slender. 



7. Stenus fallax, n. sp. iEnco-niger, dense punctatus, 

 subopacus, jialpis flavis, antennis podil)nsqne testaceis, illis 

 apice infuscatis ; fronte cxcavata, medio carinata ; abdo- 

 mine sat robusto, crebre, apicem versus obsolete, ptmctato, 

 segmento basali marginato ; tarsis gracillimis, articulo 4" 

 simplice. Long. corp. 2 lin. 



Antenna? moderately long, yellowish, infuscate towards 

 the extremity; palpi pale yellow. Head about as broad 

 as the elytra, excavate between the eyes, and with a dis- 

 tinct shining carina in the middle of the excavation. 

 Thorax rather longer than broad, the sides in front of the 

 middle distinctly rounded ; the surface coarsely and closely 

 punctured, the punctures somewhat confluent, so as to 

 form transverse rugfe. Elytra about as long as the thorax, 

 deeply, densely and coarsely punctured. Hind body 

 moderately broad, with the basal segment finely margined, 

 and carinate at the base in the middle, the two following 

 segments with less elongate carinas; the segments rather 

 closely punctxu-ed, the punctures much finer toAvards the 

 apex than on the basal segment. Legs yellow ; the femora 

 and tarsi obscured towards the exti*emity. 



In the male the 6th segment of the hind body beneath 

 is broadly impressed along the middle ; each side of the 

 impression towards the extremity is densely pubescent, and 

 there is a notch on each side concealed by the pubescence ; 

 the following segment bears an elongate narrow notch ; the 

 4th and 5th segments are also a little flattened along the 

 middle. 



Tapajos ; one male, one female specimen. 



Ohs. — This species, at first sight, a good deal suggests 

 our common Eiu'opean S. impressus : though closely allied 

 in strncture to S. co(/natus and the neighbouring species, 

 it is undoubtedly distinct from them all. 



8. Steniis simulator, n. sp. Angustulus, niger, vix 

 aenescens, nitidulus, palpis flavis, antennis fuscis, pedibus 

 testaceis, femorum apice obscuriore ; fi-onte excavata, 

 medio carinata; thorace elytrisque dense fortiterpunctatis; 

 abdomine segmento basali marginato, dense sat fortiter 

 punctato, segmentis antepenultimis dense obsolete punc- 

 tatis ; tarsis articulo 4° simplice. Long. corp. 1| lin. 



