of the Chrysomelide. 143 
pyriform ; second small, obconic; third, fourth and fifth longish, 
nearly of equal length, slender ; the remainder sensibly larger, and 
gradually decreasing in length in the females, nearly of the same 
length in the males; the terminal joint with a small apical pro- 
jection. Thorax transverse, as broad as the elytra, somewhat 
gibbous, narrow and truncate in front, rounded on the sides. 
Scutellum subtrigonate, much elevated at the apex. Body short, 
ovate ; compressed in sect. 1; nearly cylindric in sect. 2. Legs 
shortish. Tarsi 4-jointed : three first joints nearly of equal length; 
third deeply bilobed; fourth slender, cylindric, reaching but little 
beyond the third. 
This subgenus is distinguished from Dicenopsis before described 
by the antennz, but more especially by the general shape of the 
species. Dicenopsis, however, approaches very closely to some of 
the robust species of the present subgenus. 
Section I, 
(Body ovate, compressed.) 
Sp. 1. Idiocephala Roei, Hope, MSS. 
Head rufous brown, deeply punctured, with the vertex, eyes, 
and antenne black. Thorax rufous, shining, with a well defined 
black diamond-shaped patch on the centre of the disk, prolonged 
posteriorly to the scutellum, widely punctured. Scutellum black. 
Elytra rich shining green, deeply punctured, and wrinkled trans- 
versely, with a narrow marginal band of ochraceous yellow, ter- 
minating before the apex; under side of the body pale ochraceous 
yellow, pubescent, with the metasternal region black, and densely 
covered with silvery adpressed hairs. Legs black, with the bases 
of the femora and tibiz rufous brown. 
Length, female ,23,, male 31% inch. 
From the Swan River. 
In the Collections of the Rev. F. W. Hope and J. O. Westwood, 
Esq. yg = bam ari 
Var. Atripennis, W.W.S.; Anodonta atripennis, Hope, MSS. 
Elytra black, with a purple iridescence ; third and fourth joint 
of antenne brownish. 
Collections of Rev. F. W. Hope and J. O. Westwood, Esq. 
Sp. 2. Idiocephalus elegans, W. W.S. (Plate IX. fig. 2.) 
Head yellow brown, shining, slightly punctured, with a narrow 
black transverse band on the upper part, close to the margin of 
