StaphylinidcB of the Amazon Vullei/. 301 



head and thorax ; 1st joint elongate and slender, not qnite 

 so long as the three following together; 2nd joint rather 

 long ; 3rd joint elongate and very slender, longer than 

 2nd; 4 — 10 each very slender, each slightly shorter than 

 its predecessor, even the 10th three times as long as 

 broad; 11th slender, but distinctly stouter than the pre- 

 ceding ones, rather longer than 10th. Labrum large, 

 with two short, obtuse denticles in the middle, forming its 

 most prominent part ; slightly emai'ginate on each side of 

 these, and thence falling away on either side as an oblique 

 sinuation to the lateral angle. Mandibles elongate, ab- 

 ruptly curved, stout at the base ; the left in the middle 

 with a large stout tooth, which is slightly emarginate on 

 its inner side ; the right one with two rather large teeth, of 

 which the upper one is the longer. Head broader than 

 the thorax, quite as broad as the elytra ; the eyes large, 

 and very outstanding in front ; the sides behind the eyes 

 rounded and naiTowed in a curve to the neck, yellowish in 

 colour, rather flat; the sui-face with Sunius punctuation, 

 forming rather large meshes, but immediately in front of 

 the neck the sculpture obsolete ; the underside almost 

 impunctate. Thorax a good deal narrower than the elytra, 

 the sides in front of the middle much rounded and nar- 

 rowed to the neck, only very slightly curved, and narrowed 

 from the widest part to the base ; its colour and sculpture 

 similar to the head. Elytra elongate, one and a half times 

 the length of the thorax, yellowish, each with a dark spot 

 on the middle, moderately finely and closely punctured. 

 Hind body elongate and slender, dull, but only sparingly 

 and indistinctly punctured. Legs elongate, very pale. 



In the male the hind margin of the ventral plate of the 

 6th segment is broadly but slightly emarginate ; the 7th 

 has a very large and deep semicircular excision. 



Ega ; a single indi^-idual. 



16. Sunius bisp{nus,n. sp, Elongatus, subcylindricus, 

 testaceus, el}i:ris abdomineque minus distincte fusco-varie- 

 gatis ; antennis elongatis, tenuibus, labro medio breviter 

 bispinoso. Long. corp. 2| lin. 



Antennae almost white, elongate and slender ; joints 

 8 — 10, though very slender, each distinctly stouter than 

 its predecessor ; 11th joint a good deal stouter and a little 

 longer than the 10th. Labrum large, with two short, 

 distinct spines in the middle. Thorax rather broad, 



