Mr. F. P. Pascoe on Sphserion 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 antennae fulvous, 

 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 Spharion — S. Poeyi, 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 Ibidioninse. It may be named and cha- 

 racterized as follows : — 



Rhysium. 



AntenncB muticse. 

 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 

 antennse 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 is 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 antennse with a short greyish pile. Length 7 lines. 



