oj the Amazon Valley. 275 



Genus Aposphjerion, nov. gen. 



Thorax elongatus, angustatus, cylindricus, omnino 

 laevis. Antennae articulis 3-11 sulcatis, carinatis, et 

 (llmo excepto) apice spinosis. Pedes breves ; femora 

 abrupte clavata, inermia. 



Differs from all the other genera of SpTiceriincB in the 

 form of the thorax, which is greatly elongate, and 

 almost perfectly cylindrical, without a trace of lateral 

 spine or dorsal ingequalities or punctures ; it has only a 

 single transverse curved impression near the base. The 

 elytra are nearly twice the width of the thorax at the 

 base, and taper regularly thence to the apex, where they 

 are truncate and bispinose, the sutural spine much the 

 smaller ; the surface is nearly impunctate, except at the 

 base, where, for a small space, they are very strongly 

 punctured, and there are only a few long hairs. The 

 chief peculiarity of the genus, however, is in the an- 

 tenna, without which I should have hesitated to se- 

 parate it from Perihoeum. This consists in the grooves 

 and carinas, which in the allied genera are confined to 

 the third, fifth, or sixth joints, but are here extended to 

 the apex ; all these joints being spinose at the tips, ex- 

 cept, of course, the eleventh. The legs are short, and 

 the femora abruptly clavate, and quite unarmed at the 

 tips. The palpi are extremely short, with the terminal 

 joints triangular. The intermediate sockets are closed ; 

 the anterior haunches are globular, with the narrow pro- 

 sternum sunk between them. 



Notwithstanding the cylindrical form of the thorax, 

 the genus has not at all the facies of Ihidion, a circum- 

 stance which arises from the thorax not having the 

 arched appearance characteristic of the Ihidion group. 



1. Aposjohcerion longicolle, n. sp. 



Angustatum, castaneum, politum ; capite antice sparse 

 punctate ; thorace cylindrico, laevi, prope marginem pos- 

 ticum arcuatim sulcato ; elytris postice attenuatis, apice 

 bispinosis, supra laevibus, prope basin aspere punctatis, 

 postice prope suturam punctis nonnullis setiferis. 



Long. 4^-7 i lin. ^ ? . 



Hah. — Obydos, Lower Amazons ; on branches of dead 

 trees. 



