Mr. H. W. Bates on the Coleoptera of the Amazon Valley. 471 



XLVI. — Contributions to an Insect Fauna of the Amazon Valley. 

 Coleoptera : Longicornes. By H. W. Bates^ Esq. 



[Continued from p. 219.] 

 c. J'ore tibiae neither dilated nor compressed. 



10. Acanthoderes albolinitus, n. sp. 



A. elongatus, subcylindricus, tenuiter tomentosus, fulvo-brunneus : 

 elytris apice conjunctim rotundatis, pone medium plaga communi 

 antice biramosa griseo-alba et vitta abbreviata nigra utrinque or- 

 natis. Long. 8J lin. $ • 



Head dingy fulvous, punctured. Antennae stout, as long as 

 the body,. fulvous brown, each joint from the third ringed with 

 dusky near the apex. Thorax with the lateral tubercles large, 

 conical, and pointed; the two dorsal tubercles connected by 

 i:idges with the hind margin ; the dorsal line strongly elevated, 

 the interstices coarsely punctured. Elytra elongate, very slightly 

 narrowed posteriorly ; the apices scarcely perceptibly truncated, 

 somewhat convex, the centro-basal ridges strongly raised at the 

 base, subsiding before the middle ; the whole surface punctured, 

 each puncture having a greyish-white scale : the colour is light 

 yellowish brown ; behind the middle, over the suture, is an ill- 

 defined greyish-white patch, prolonged on each side in front 

 into an oblique streak : on the disk of each elytron, behind the 

 middle, there is also a short inwardly curved black vitta con- 

 nected by a zigzag line with the lateral margin. Body beneath 

 and legs black, shining, clothed with thin ashy pile ; apex of 

 tibiae and tarsi fulvous. The prosternum is simply rounded; the 

 mesosternum bituberculate in front. 



One individual only of this aberrant species occurred : I found 

 it at Ega, on a slender dead branch. 



11. Acanthoderes longispinis, n. sp. 



A. elongatus, subconvexus, tenuiter tomentosus, brunneo-fulvus : 

 elytris plagis pallidioribus, maculis nonnullis punctisque numerosis 

 nigro-brunneis ornatis, apice sinuato-truncatis, angulis externis in 

 spinam longissimam productis. Long. 8 Hn. § . 



Head dingy fulvous, impunctate, front uneven, channeled; 

 lower lobe of the eyes very large for this genus, reducing there- 

 fore the breadth of the forehead. Antennae slender, as long as 

 the body, piceous brown, each joint ringed with testaceous at the 

 base. Thorax fulvous, varied with dark brown ; lateral tubercles 

 large, very acute, dorsal ones very large, elongated, and obtuse ; 

 the disk with a few coarse punctures. Elytra curvilinearly 

 attenuated posteriorly, the centro-basal ridges slightly raised to- 



