of Australian Chrysomelide. 203 
yellow, shining, regularly and deeply punctured, each marked with 
three broad longitudinal black bands: the first somewhat triangular 
in shape, commencing near the scutellum and running half way 
along the suture; the second commencing near the shoulder and 
running to near the apex parallel to the first band and the suture ; 
the third joining the second at the shoulder and running parallel 
to the lateral margin until it-joins the second near the apex, en- 
closing with it an oblong oval yellow space. Under side of body 
black, clothed with short adpressed whitish hairs. Legs and tarsi 
black. 
Length ;3,¢, inch. 
Habitat Australia. 
In the Cabinets of the Rev. F. W. Hope, Capt. Parry, &c. 
There is a little variation of marking in some specimens, caused 
by the second longitudinal band of the elytra meeting the sutural 
band a little below the middle, as shown in the figure accompanying 
this description. 
Fig. 2a, antenna; 25, fore feet. 
Oncnosoma, New Genus (Oykoe wpoc). 
Head vertical, immersed in the thorax nearly up to the eyes. 
Antenne short, a little longer than the thorax, 11-jointed: first 
joint long, stout, somewhat pyriform; second orbicular; third, 
fourth and fifth slender, rather long, equal in length; the remain- 
ing joints gradually becoming shorter, but at the same time more 
robust, and forming an elongate club. Thorax transverse, with 
the lateral margins dentate or rough, and having two more or less 
elevated protuberances on the upper surface, one on each side of 
the central line. Scutellum subquadrate, much narrowed and 
somewhat elevated behind. L/ytra with the surface rugose, short, 
rather longer than broad, with the apices rounded. Legs short, 
robust. Tarsi robust, 4-jointed: first and second joints trans- 
verse ; third longer, deeply bilobed; fourth joint narrow, laying 
in the cleft of the third, and barely exceeding it in length. 
The species of this genus are easily distinguished by the two 
protuberances on the upper surface of the thorax, which gives 
them an unusual appearance among their congeners the Crypto- 
cephalides. ‘The species are very uniform in size and in the brown 
tints of their colours. The genus Brachycaulus, described by 
Monsieur Fermaire, in the “ Annales de la Société Entomologique 
de France, 1843, premier trimestre, p. 13,” appears to be a very 
near approach to Onchosoma and may prove identical, in which 
