Staphylinida of the Amazon Valley. 401 



tlie antennre. These changes may be briefly summed up 

 as follows : in Osorius the labrum appears to be attached 

 to the edge of the front of the head, but is, in fact, 

 attached to a membrane underneath the front of the head, 

 and is, therefore, mobile ; in Apocellus this membrane 

 intervenes in a very visible manner between the front of 

 the head and labrum ; for I consider the large semi- 

 corneous portion of the head, intervening between the 

 transverse suture (very visible in Apocellus) and the 

 labrum, to be clearly the homologue of the membrane 

 above mentioned in Osorius, and which is very visible in 

 many of the Staphylinini. In the Aleocharini the trans- 

 verse suture above alluded to has disappeared, and the 

 antennal tubercles can scarcely be recognized. 



1. Apocellus planus, n. ^'^. Testaceus, metasterno, ab- 

 domine, elytrisque plus minusve infuscatis ; capite, thorace, 

 elytrisque opacis, dense subtilissime strigosulis ; abdomine 

 nitidulo, fere impunctato. Long. corp. \^ lin. 



Antenna yellow, rather stout and very elongate, longer 

 than head, thorax and elytra ; 2nd and 3rd joints slender 

 and elongate, the latter a good deal the longer ; 10th joint 

 much longer than broad, 1 1th distinctly longer than 10th. 

 Head yellow, the part in front of the transverse suture 

 between the antennal tubercles more shining and less cor- 

 neous than the other parts ; the antennal tubercles strongly 

 elevated, the front rendered opaque by very fine, indistinct, 

 strigose sculpture, the middle with an indistinct fovea. 

 Thorax small, only about half as broad as the elytra, about 

 as long as broad, distinctly narrowed towards the base, 

 very finely margined at the sides and base, subquadrate, 

 but with the angles rounded ; the surface rendered opaque 

 by a very fine, indistinct, strigose sculpture. Elytra 

 distinctly longer than the thorax, yellowish, but somewhat 

 infuscate, especially towards the pleurre ; opaque, densely 

 and finely strigose. Hind body broad, a little curved at 

 the sides, shining yellowish, slightly infiiscate, especially 

 towards the extremity, almost impunctate ; its under face as 

 well as the metasternum more distinctly infuscate. Legs 

 elongate, pale yellow. 



Ega ; three individuals, of doubtful sex. 



2. Apocellus l(Bins, n. sp. Castaneo-testaceus, nitidulus, 



TIIANS. ENT. SOC. 1876. — PART II. (jUNE.) D D 



