of the Amazon Valley. 107 



Var. Paraense, rather more robust ; the surface and sides of 

 elytra more thickly punctured, and the apex simply truncated, 

 without sinuation. 



This was rather a common insect at Ega, on dead twigs. The 

 variety was found at Para. 



3. Alcidion latipenne, n. sp. 



A. crassum, postice modice attenuatum, apice transverse sinuato- 

 truncatum : elytris humeris valde productis lateribusque carinatis. 

 Long. 4-6 lin. $ S • 



Head dusky ; antennae testaceous brown ; base of all the joints 

 from the third pallid. Thoi'ax much broader than long, surface 

 uneven, tawny brown, silky, with a V-shaped dusky mark be- 

 hind, joining two dusky spots on the sides of the scutellum. 

 Elytra very broad and convex at the base, gradually narrowed 

 to the apex, which is broadly and transversely sinuate-truncate, 

 with the external angles somewhat produced ; the shoulders are 

 very prominent, and from the acute edge of each commences the 

 lateral carina, which extends nearly to the apex ; the surface is 

 even and moderately punctured, the colour being reddish or 

 tawny brown, slightly streaked here and there with ashy, espe- 

 cially in the middle, and having rows of small dusky specks, a 

 large violet-brown spot lying on the deflexed margin beneath 

 the shoulders. Beneath and legs testaceous brown. 



Ega, and on the banks of the Cupari, a branch of the Tapajos. 



4. Alcidion interrogationis, n. sp. 



A. valde elongatum, postice parum attenuatum, carneo-griseum seri- 

 ceum : elytris apice longe mucronatis, litura nigra signum interro- 

 gationis simulante ornatis. Long. 5^ lin. 



Head brown; antennse dusky, base of joints from the third 

 pallid, the first joint stx'ongly waved. Thorax tawny, sides 

 black, and disk with a black mark shaped like a horse-shoe. 

 Elytra elongated, quickly narrowed behind the shoulders, then 

 widening slightly, afterwards towards the apex again narrowed, 

 the apex itself being rather broad and sinuate-truncate, the in- 

 ternal angle dentiform, the external one produced into a length- 

 ened spine; the shoulders are acute, and from their edge com- 

 mences the lateral carina, which is very prominent, but is so 

 placed as to leave the deflexed portion of the elytra beneath it 

 visible from above ; the surface is rather thickly punctured in 

 the middle towards the base, sparingly so in other parts ; the 

 centro-basal ridges are short, but extremely elevated, hooked 

 posteriorly, and surmounted by a crest of black hairs; the colour 

 is grey, with a rosy tint in some lights, and towards the apex 

 there is on the disk of each a black curved line and spot resem- 



