StapJiylinidce of the Amazon Valley. 159 



5. Bclonuchus decipiens, \\. sp. Niger, nitidus, anten- 

 narum basi pcdibusque piceis, ano late tcstacco, protlio- 

 racis serie dorsali 5-piinctato, abdomine crebre punctato. 

 Long. Corp. o.^ lin. 



INlas : capite majore cly]3eo sub-bidentato, abdomine 

 scgmento 1'^ ventrali apice leviter emarginato, femoribus 

 posticis subtus fortiter biseriatim spinosis. 



Fern. : femoribus posticis uniseriatim setosis. 



AntennfB blackish, ^Yith the two or three basal joints 

 pitchy, and the last joint rusty ; 3rd joint but slightly 

 longer than 2nd, 4th quadrate, 5 — 10 transverse but not 

 strongly so. Palpi reddish ; mandibles pitchy. Head 

 black and shining, with two points on each side between 

 the eyes, and with several other coarse punctures on each 

 side near the hind angles, the front portion with an im- 

 pressed line extending half-way to the back. Thorax 

 rather narrower than the elytra, quadrate, not or scarcely 

 narrowed behind, the anterior angles a little depressed and 

 rounded, the sides scarcely sinuate; it is black and shining, 

 and has on each side a dorsal row of five punctui'cs; of 

 these the hinder one is placed at a distance from the 

 others. The elytra are about as long as tlie thorax, 

 shining blackish, rather finely and not closely punctured. 

 The hind body is black, with the hind portion of the 6th 

 and the whole of the 7th segment yellow ; segments 2 and 

 3 are rather sparingly punctured, 4 — 6 more closely 

 punctured and with a coarse black pubescence, 7th seg- 

 ment very finely and sparingly punctured. Legs pitchy. 



The individual described above is a male (from Ega), 

 and has the head rather larger than the thorax ; the man- 

 dibles and palpi elongate, the clypeus obtusely projecting 

 on each side between the insertion of the antennaj ; the 

 back part of the under face of the anterior femora dilated 

 from the base to near the extremity, and furnished with 

 short sjjines, the hind femora beneath with two rows of 

 stout spines, and the hind margin of the 7th ventral seg- 

 ment of the hind body a little emarginate. 



Lga ; two males. 



Obs. — A series of female specimens from Para, Tapajos 

 and Ega, are, I have no doubt, the other sex of this 

 species. They have the head not broader than the thorax, 

 the mandibles and maxillary palpi shorter, the clypeus 

 simple, the front femora not dilated beneath, and the 

 hinder femora destitute of the two rows of stout spines. 



