Stapliylinidce of tJie Amazon Valley. Ill 



the 6th and the whole of the 7th segment bright, reddish- 

 yellow ; segments 3 — 6 sparingly punctnred, 7th nearly 

 impnnctate ; the pnbescence is scanty, and is yellowish on 

 segments 3 — 5. Front legs yellowish, with the coxre and 

 base of the femora pitchy ; middle legs dusky yellow, 

 their tibiae rather darker ; hind legs nearly black, with the 

 tarsi ferruginous. 



In the male the 6th segment beneath has the hind mar- 

 gin emarginate in the middle ; the 7th is triangularly pro- 

 duced in the middle, but instead of being pointed has a 

 small notch at the extremity. 



Ega ; four specimens, 3 ^ , 1 $ . 



3. Brachydtrus styloceros, n. sp. Fulvo-testaceus, ab- 

 domine nigro, ano pedibusque testaceis. Long. corp. 4g lin. 



Mas : abdomine segmento sexto ventrali apice medio sat 

 profunde semicirculariter emarginato, 7" carinato-com- 

 presso, in stylo tenui apice bifido producto. 



Antennge yellow, rather short, thickened towards the 

 extremity ; 2nd and 3rd joints about similar in length ; 

 6tli joint about as long as broad, 7 — 10 transverse ; last 

 joint moderately long and pointed. Head a little broader 

 than the thorax, very short ; the front part extremely 

 densely, the vertex more sparingly punctured. It is of a 

 tawny-yellow colour, with an extremely fine pubescence. 

 Thorax rather shorter than long, a little broader in front 

 than behind, the sides a little sinuate ; like the head and 

 elytra, it is of a tawny-yellow colour, coarsely and irregu- 

 larly pvmctured, with the usual smooth spaces. Elytra 

 considerably longer than the thorax, rather coarsely punc- 

 tured, with a distinct concolorous pubescence. Hind body 

 narrower at the extremity, black, with the hind margin of 

 the 6 th segment and the whole of the 7 th yellow ; lateral 

 lobes of the 8th black ; 2nd segment impnnctate, 3—6 

 moderately punctured, 3 and 4 Avith a yellowish pubes- 

 cence. Legs yeUow. 



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

 has a broad and rather deep semicircular incision ; the 

 ventral plate of the 7th segment is most remarkably 

 formed, being compressed into a sort of keel, and produced 

 behind as a slender tongue, the extremity of which is 

 divided into two still more slender, short styles. 



In the female the ventral plate of the 7tli segment is a 

 little produced, and is pointed at the extremity ; in this 



