Staphylinidm of the Amazon Valley. 55 



the punctuation being less evident on the apical segments. 

 Beneath it is closely and distinctly punctured. The basal 

 joint of the posterior tarsus about as long as the tlu'ee 

 following together. 



In the female the 6th segment above has a longitudinal 

 elevation on each side ; the 7th segment is covered mth 

 granulations not much elevated, but with their points 

 directed backwards ; these granulations are larger towards 

 the extremity of the segment, and the hind margin is 

 slightly emarginate. 



Ega ; one specimen, which I consider to be a female. 



qIs. — Though rather closely allied to 3L scahripennis, 

 31. pollens will be very readily distinguished therefrom by 

 the denser and finer punctuation of the thorax and elytra, 

 and by the less uneven surface of the thorax. 



3. Mijrmedonia Batesi, n. sp. Nigro-picea,_ nitidula, 

 elytris opacis, brunneis, apiccm versus late infuscatis, 

 autennarum basi pedibusque pallidis; prothorace sub- 

 quadrato, ina?quali, fortiter punctato ; elytris dense sub- 

 tiliter scabrosis ; abdomine supra IfBvigato, subtus crebre 

 subtiliter punctulato. Long. 4 lin. 



Antenna? moderately long and slender, pitchy, paler at 

 the base ; 3rd joint twice as long as the 2nd ; 4th shorter 

 than the 3rd, twice as long as the 5th; 5— 10 each a 

 little shorter and a little broader than the preceding one, 

 5th about as long as broad, 10th with the breadth greater 

 than the length'; lltli pointed, quite t^dce as long as the 

 10th. Head black and shining ; front punctured on each 

 side, smooth in the middle. Thorax black, its breadth 

 one and a third times its length, scarcely narrowed behind ; 

 the base rounded; the posterior angles extremely obtuse, 

 the anterior rounded and deflexed; its upper surface 

 strongly ])unctured and uneven, with an impression m 

 front'of the scutellum, and with an indistinct longitudinal 

 channel, and a large ill-defined impression on each side, 

 reaching from the posterior angles nearly to the front. 

 Elytra about as long as the thorax, reddish, but all the 

 hind part smokv black, densely and finely scabrous, punc- 

 tate, more strongly so near the suture behind. Hmd body 

 pitchy, with the margins of the segments paler, narrowed 

 behind, and with the basal segment a little constricted, 

 smooth, shining and impunctate above, finely and closely 

 punctured below ; the side margins of the segments much 



