Siaphylinidce of the Amazon Valley. 113 



Mas : abdomine segmento 6° ventrali margine posterlore 

 emarginato, 7° apice medio anguste sat profuii deque 

 excise. 



Antennas yellow, short, a good deal tliickened towards 

 the extremity ; 4th and 5th joints similar to one another, 

 not at all transverse ; 6th joint a little transverse, 8 — 10 

 strongly transverse, 11th moderately long. Mandibles 

 pitchy. Head with the upper surface largely of a metallic- 

 green colour ; the vertex however tawny ; densely and 

 coarsely punctured, the punctuation distinctly less dense 

 on the vertex than on the anterior portion. Thorax a 

 good deal narrower than the elytra, with rather coarse and 

 numerous punctures, distributed in the usual manner. 

 Elytra a good deal longer than the thorax, and, like it, 

 of a tawny colour. Hind body black, with the hind part 

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

 lobes of the 8th segment black ; the 2nd segment is im- 

 punctate, and has a few yellow hairs on each side ; 3rd 

 segment sparingly punctured, and with yellow hairs on 

 each side ; 4th and 5th rather sparingly punctured, much 

 clothed with pale hairs; 6th segment more closely, 7th 

 very sparingly, punctured. 



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

 6th segment is emarginate, while the next segment bears 

 a narrow, rather deep notch in the middle. In the female 

 the hind margin of the ventral plate of the 7 th segment 

 forms a very obtuse angle in the middle. 



Three individuals, 2^,1$, found by Mr. Bates ; the 

 male specimen described is labelled Para. I have also 

 a male individual of the species labelled Peru in my col- 

 lection ; it differs only very slightly from the Para indi- 

 vidual. 



6. Brachydirus amazonicus, n. sp. Fulvus, abdomine 

 nigro, ano testaceo, antennis articulis 8 — lOfuscis. Long. 

 Corp. 4^ lin. 



Mas latet. 



AUied to the B. cribricollis ; antennae longer and less 

 stout, and with the three joints before the last one dark, 

 and the thorax much more sparingly punctured. An- 

 tenna with 3rd joint slightly longer than the 2nd, slender 

 to the 6th joint, 7th slightly transverse, 8 — 10 distinctly 

 so; last joint much pointed. Head broad, rather broader 



TRANS. ENT. SOC. 1876. — PART I. (MAY.) I 



