273 
of the Amazon Valley. 
interrupta, nigris ; femoribus robustis, clavatis ; corpore 
subtus pube sericea cinereo-fulva dense vestito^, protbo- 
race opaco lanuginoso punctate. 
Long. 1 un. 1 lin. ^ . 
Allied to Sph. procerumf Ericbs. (in Schomb. Keis. 
Brit. Guiana), differing chiefly in colour, and in the 
markings of the elytra. 
Hah. — Tapajos. I found it in repose on a leaf in the 
forests. 
Genus Peeibceum. 
Thomson, Syst. Ceramb. p. 245 ; Lacord. Gen. viii. 318. 
According to Lacordaire, this genus is distinguished 
among the Sphceriince, by the pedunculate femora, i.e., 
slender at the base and clavate beyond the middle, by 
their unarmed apices, and by the integument being 
glabrous or not clothed with fine pubescence as in 
Sphcerion proper. One of the species here described 
invalidates this definition, as it possesses the abruptly 
clavate form of the femora characteristic of Perihoeum, 
and their bispinose apices, which is distinctive of the 
genus Nephalius. 
1. Periboeum pubes cens. 
Cerambix pubescens, Olivier, Ent. No. 67, p. 33, pi. xviii. 
f. 135. 
Minus elongatum, postice attenuatum, rufo-castaneum, 
nitidum, longe et sparsim griseo-hirsutum ; capite et 
dimidio apicale elytrorum nigris, interdum capite solum 
nigro ; thorace tuberculo valido lateral! aliisque quatuor 
et Carina mediana dorsalibus ; elytris sparsim punctulatis, 
punctis piliferis asperatis, apice truncatis et unispinosis. 
Long. 4-8i lin. J ? . 
Common throughout the Amazon region. Varies from 
clear reddish-chesnut, with the head alone black, to dark 
chesnut, with the head, thorax, apical half of the elytra, 
and abdomen, black. The head, basal joint of the an- 
tennae, and underside of the prothorax, are clothed with 
grayish tomentum. 
