130 
basal angles, these obtusely rounded; lateral border thick ; 
lateral channel extending to base ; two lateral basal impressions 
of each side deep, inner short, curving outwards, external 
elongate-foveiform ; space between external basal impression and 
margin narrow, convex ; posterior setigerous puncture placed at 
extremity of lateral channel. Elytra oval (8 x 4:8 mm.), de- 
pressed on disc, more strongly declivous than usual in genus on 
sides, on base (at each side of scutellum) and at apex ; sides sub- 
parallel (very lightly rounded); base truncate; apical curve 
lightly, but decidedly, sinuate on each side; five inner striz 
entire, 1-4 deeply impressed, sixth and seventh obsolete, their 
course hardly indicated, except at apical extremity ; fourth 
interstice convex ; lateral border lightly reflexed ; basal border 
joining lateral border at humeral angle with a slight interrup- 
tion, but without any prominence. Prosternum truncate at 
base ; a linear transverse impression just before base. Ventral 
segments roughly punctulate, the puncturation extending across 
the three apical segments. 
Length, 13; breadth, 4°8 mm. 
This species must be closely allied to &. cardwellensis, Blkb., 
with which it agrees in having the prothorax narrower across the 
base than across the apex. Judging by Mr. Blackburn’s descrip- 
tion, the following appear differences between these two species : 
—The sides of the prothorax in FR. cardwellensis are described as 
sinuate before the basal anygles—in &. obtusus they are not 
sinuate ; and the basal angles of the prothorax, though obtuse, 
are marked in &. cardwellensis—in f. obtusus they are quite 
rounded off. The type of &. cardwellensis in Mr. C. French’s 
collection is a male, so that it is possible A. obtwsws may prove 
the female of that species, but this I consider extremely unlikely. 
Two female specimens were in the collection, one of these (now 
in my collection) has the striz of the elytra strongly punctulate, 
the other (the type) has the striz a little crenulate ; this I think 
may be a post-mortem effect produced by immersion in alcohol, 
and might not be found in fresh specimens. 
Notr.—Since the above description was written I have been 
in Sydney, and have seen the types of Rhytisternus (Omaseus ) 
Froggatti, Macl.; the imp:ession left upon me by an examination 
of that species is that R. obtwsws is possibly identical with it. 
However, till specimens are compared, or the range of the species 
determined, it will be safer to allow R. obtwsus to retain its 
specific name, with a query as to the possibility of its identity 
with R. Froggatti. 
