ANNALS OF THE QUEENSLAND MUSEUM. 
A single male specimen collected by Mr. H. Deane, M.Inst. 
C.E, It is nearest in form to 0. Bated, H.-Rut., and 0. opacus, 
Bates ; but the former (from Queensland) has punctured elytra, and 
is evidently larger, while opacus is evidently smaller, and has a 
.squarer (less rounded) prothorax amongst otlier differences. 
Type in the author's collection. 
ONOSTERRHUS SOCIUS n. sp. 
Ovate, opaque black above, moderately nitid beneath, antennae 
and tarsi piceous, the former with apical joint reddish, tibiae and 
tarsi with red ton len turn. Head — Labium prominent showing mem- 
brane, epistoma truncate in front, side angles rounded, forming 
distinct though wide angle with the widely rounded and raised can- 
thus ; separating suture curved, well marked at the sides, forehead 
somewhat depressed (i.e., little raised above the plane of epistoma), 
whole surf ace closely and not very finely punctured ; antennae not 
extending to base of prothorax, third joint as long as fourth and 
fifth combined, apical four rounded and more transverse than 
preceding, eleventh longer than tenth. Prothorax 5.5 x 8 mm. 
(length measured in middle), greatest width in front of middle, 
wider at base than at apex, the latter emarginate with anterior 
angles acute but slightly rounded at tips, posterior angles acute and 
strongly produced into a defined tooth, sides slightly sinuate 
posteriorly, very little rounded and widened from base to near 
apex, then more strongly converging anteriorly, extreme margins 
thickened and rope4ike, this border abruptly terminating on front 
of anterior angle, base and discal portion of apex without definite 
border, lateral channels wide and sub-foliaceous, base truncate, disc 
without any medial line, minutely and closely punctured, the punc- 
tures finer than those on head. Scutellum widely transversely trian- 
gular. Elytra (13 x 11 mm.) very convex and oval, wider than pro- 
thorax at, base, shoulders obtusely rounded, greatest width near 
middle, margins very narrow and sub-obsolete anteriorly, slightly 
wider and horizontal near apex, extreme border very narrow and 
nitid, a lateral row of large closely-set punctures evident for greater 
part of length, each elytron with three distinct but not very 
prominent costae, besides the raised suture, with irregular trans- 
verse reticulation, the interstices dotted rather closely with large 
punctures, irregular in size and position, becoming less defined and 
