of the Amazon Valley. 477 



side than on the other. Thorax with the lateral and dorsal 

 tubercles large, conical, and acute ; velvety-black, with two large 

 rounded spots on each side, two elongate ones on the fore part, 

 which are divergent behind, and another in the middle of the 

 hind margin, white. Elytra elongate-trigonal, depressed toge- 

 ther down the suture, the apex obliquely sinuate-truncate, outer 

 angles acute ; the centro-basal ridges much raised at the base, 

 projecting over the hind edge of the thorax, prolonged behind 

 to the apex, and granulated at their commencement ; the surface 

 impunctate, except on the suture near the base ; the colour is 

 velvety-black, each elytron having two spots along the suture 

 behind the scutellum, a broken sutural stripe from the middle 

 to the apex, a spot near the shoulders, a large rounded one near 

 the lateral margin before the middle, a small one near the apex, 

 and one in the middle of the disk, all of a white colour. Body 

 beneath black, sides of the sterna and abdomen having large 

 white spots. Femora and tibirc black clothed with grey pile ; 

 tarsi fulvous. The opposing faces of the presternum and 

 mesosternum are subvertical and sharply bituberculated. The 

 four apical joints of the antennas in the d are shortened and 

 ciliated. 



This extremely beautiful species occurred only at Caicara, a 

 village near Ega, on the Upper Amazons, on the trunks of felled 

 trees in the forest. 



Genus Dryoctenes, Serv. 



Serville, Ami. Soc. Ent. Fr. iv. 24. 



As already remarked, there is no character to distinguish this 

 genus from Acanthoderes, with which it will eventually have to 

 be incorporated. The species have a much broader and more 

 depressed form of body, and the antennse are much longer, than 

 is the rule in the genus alluded to. The proportions of the an- 

 tennal joints, form of muzzle, legs, male tarsi, and thorax are 

 the same as in Acanthoderes. In the style of coloration and 

 markings the species resemble most A. bivitta and its nearest 

 allies. 



Dryoctenes scrupulosus, Germar. 



Lamia scrupulosa, Germ. Insect, spec. nov. 4/0, G19. 



There appear to be two somewhat distinct forms or geogra- 

 phical races of this species. The example before me, taken on 

 the banks of the Tapajos, differs considerably in colours and in 

 the shape of the elytra at the apex from the form found at Rio 

 Janeiro. The description of Germar with reference to the elytra 

 (" glauco-tomentosa, apice truncata, intus dentata ") applies to 

 the Amazonian example better than to those I have seen from 



