256 
by Burmeister and Lacordaire is scarcely noticeable ; Erichson in 
characterising the genus did not mention either organs of stridu- 
lation or a tubercle on the head. I have before me a fairly long 
series of a species that is almost certainly P. porcellus, Er., with 
the description of which it agrees well. I described this species 
(Tr. Roy. Soc., 8.A., 1887, p. 220) as “P. porcellus, Er. (?)” but 
subsequently have examined fresh series of it and think there is 
very little doubt of its being porcellus, and shall so consider it 
until evidence to the contrary turns up. 
A. The striz and rows of punctures well defined to 
considerably behind the middle of the elytra. 
B. Hind tarsi very short, their third joint scarcely 
(in the female not) longer than wide ... erassus, Blackb. 
BB. Hind tarsi less short, their third joint 
markedly longer than wide. 
C. Subsutural region of elytra coarsely and 
rather closely punctured ; subsutural strize 
strongly impressed in front _... ..  porcellus, Er. 
CC. Subsutural region of elytra levigate or 
nearly so; subsutural striz very lightly 
impressed ae ie ... sydneyanus, Blackb. 
AA. The striz and rows of puactures scarcely reach 
the middle of the elytra ... : ... dubius, Blackb. 
P. sydneyanus, sp. nov. Ovatus ; fortiter convexus ; sat nitidus ; 
ferrugineus, subtus hirsutus ; capite ruguloso, clypeo antice 
leviter bisinuato; prothorace levigato; elytris sat fortiter 
punctulato-striatis, striis longe ultra medium continuis 
(suturali in nulla parte fortiter impresso), interstitiis fere 
levibus; pygidio ad basin crebre punctulato, in cetera 
parte levi; tarsis posticis sat brevibus, articulo basali ad 
apicem extrorsum sat fortiter dilatato, articulo 3° quam 
latiori sat longiori. 
Maris capite vix manifeste tuberculato. 
The male is scarcely distinguishable from the female except by 
the emargination of the apical ventral segment and the greater 
convexity of its pygidium. 
N.S. Wales. 
ANEURYSTYPUS. 
I characterised this genus in Tr. Roy. Soc., S.A., 1887, on a 
S. Australian species which I named A. calvus. Subsequently I 
have seen other species some of which I described in Pr. LS., 
N.S.W., 1890, and I took the opportunity of writing those de- 
scriptions to mention that the generic characters I had drawn 
from the mouth organs of A. calvus did not seem to be truly 
generic as they were not exactly reproduced in other species that 
had come under my notice. The examination of still additional 
species confirms this observation and also shows an apparent 
difference in the form of the mentum even between individuals of 
