StaphylinidcE of the Amazon Valley. 267 



shining. Legs yellowish ; basal joints of front tarsi a little 

 dilated; hind tarsi slender and rather long, 4th joint 

 simple : underside of head coarsely punctured, with only 

 a narrow sjiace along the middle smooth. 



Tapajos; six individuals, in Avhich I perceive no indica- 

 tions of external sexual characters. 



19. Lithocharis polita, n. sp. Kufo-testacea, nitida, 

 parce nigro-setosa, fere impunctata ; prothorace subqua- 

 drato, basin versus angustato, angulis anterioribus minus 

 rotimdatis; elytris thorace paulo longioribus, macula longi- 

 tudiuali fusca ; abdomine parce punctato, segmento sexto 

 utrinque maculate. Long. corp. 3 lin. 



Antennas reddish, scarcely longer than head and thorax, 

 rather slender, very slightly thickened towards the ex- 

 tremity ; .3rd joint elongate and slender, one and a half 

 times the length of 2nd; lOtli joint a good deal longer 

 than broad ; 11th joint obtusely pointed, distinctly longer 

 but not broader than 10th. Labrum wdth a large notch 

 in the middle, reaching almost to the base, the front margin 

 projecting as a tooth on each side the notch. Mandibles 

 short, the basal portion very stout, and at the extremity 

 with three or four fine teeth or serrations ; beyond these 

 abruptly contracted. Maxillary palpi with the 3rd joint 

 truncate at the extremity ; the 4th joint hidden. Head 

 broad and short, quite as broad as the thorax ; the vertex 

 nearly straight, but with a distinct emargination in the 

 middle, shining reddish-yellow; the surface with a few 

 scattered punctures, each bearing a black seta. Thorax 

 in front nearly as broad as the elytra, not quite so long as 

 broad ; the sides not curved, but a good deal narrowed 

 towards the base, the front a little rounded, the angles a 

 little rounded ; the surface shining reddish-yellow, impunc- 

 tate, except for some setigerpus punctures at the sides. 

 Elytra a little longer than the thorax, quadrate, reddish; 

 each with a dark mark on the middle towards the extre- 

 mity, smooth and shining, each with a series of fine distant 

 punctures close to the suture, and with two or three other 

 such series of punctures towards the sides. Hind body 

 broad, strongly margined, sparingly punctured, reddish ; 

 the 6th segment on either side wdth a large dark mark. 

 Legs yellow; hind tarsi slender ; the basal joint elongate, 

 2, 3 and 4 each shorter than its predecessor. 



In the male the front tarsi are distinctly dilated; the 



