Mr. F, P. Pascoe on Spheerion and Mallocera. 483 
flexuous line from the shoulder to near the apex throwing off 
two transverse branches, one behind the. shoulder, the other 
near the middle; body beneath, legs, and antenne fulvyous, 
covered with long slanting hairs. Length 8-10 lines. 
The genus Centrocerum (Dej.), described by M. Chevrolat in 
‘the French ‘ Annales’ (1861, p. 189), and which has for its type 
Elaphidion exornatum, Newm., approaches in coloration some 
species of Spherion—S. Poéyi, for example. A Bolivian Longi- 
corn was afterwards distributed by the late M. Deyrolle under 
the same generic name. It belongs, however, to a very distinct 
form, which, in its entire anterior acetabula and elongated pro- 
thorax, approaches the Ibidionine. It may be named and cha- 
racterized as follows :— 
RuHyYsIumM. 
Antenne mutice. 
Prothorax oblongus, subdepressus. 
Elytra angusta, apicibus rotundatis. 
Mesosternum declive. 
The head is short and concave in front ; the antennary tubers 
are stout and divergent ; the eyes are broadly emarginate; the 
antennee are without spines, as long as the body in the female, 
and half as long again in the male, the scape is subpyriform, 
the third joint 1s twice the length of the scape in both sexes; 
the rest of the joints in the female are not longer than the 
scape, in the male they are considerably longer; the prothorax 
is oblong, broader in the middle, its disk marked with three 
nearly obsolete tubercles; the elytra are narrow and elongate, 
and rounded at the apices; the legs are compressed, the femora 
thickened, the four posterior tarsi equal; the pro- and meso- 
sterna depressed, the latter elongate. For the only known spe- 
cies I have adopted M. Deyrolle’s name. 
Rhysium bimaculatum. 
R. brunneum, nitidum, sparse griseo pilosum; singulis elytrorum 
macula mediana flava. 
Hab. Bolivia. 
Glossy brown, inclining to umber, clothed with short, scat- 
tered, greyish hairs; the elytra with a large yellowish spot on 
the middle of each; head roughly punctured on the vertex ; 
prothorax nearly impunctate, covered with a loose greyish to- 
mentum ; elytra finely and irregularly punctured ; body beneath, 
legs, and antenne with a short greyish pile. Length 7 lines. 
