49 
brevi minus perspicua); elytris ad apicem sat rotundatis 
nonnullorum exemplorum angulo suturali brevissime acuto), 
punctulato-striatis, interstitiis leviter convexis crebre sub- 
aspere punctulatis ; prosterno medio fortiter gibbo, fortius 
vix crebre punctulato, hoc ad latera haud deplanato, 
suturis prosternalibus rectis, pronoti margine antico in pro- 
sternum defiexo; tarsorum lamella sat angusta. 
Maris antennis prothoracis basin sat longe superantibus ; pro- 
thorace a basi ad apicem sinuatim angustato. 
Femine antennis prothoracis basin vix attingentibus ; prothorace 
ad medium quam trans basin parum angustiori. Long., 63— 
73 1.5 lat., 14—22 1. 
The Australian species of Monocrepidius may be best sub- 
divided, in my opinion, by the structure of the lateral margin of 
the pronotum and prosternum which assumes three different 
forms. In some species (e.g., Australasia, Boisd.) it is strictly 
lateral ; in others (¢.g., acwminatus, Macl.) it is deflexed in front 
so that (viewed from directly above) the front part of it passes 
out of sight and both margins can be seen together in their 
entirety only by turning the specimen upside down and looking 
at them on the prosternum, but in other respects it is as in the 
former group; in a third group of species (¢.g., nigripennis, Cand.) 
it passes on to the prosternum behind the middle of the segment 
(so that the greater part of it is invisible when the pronotum is 
viewed from directly above) and is bordered on the prosternum 
by a well-defined sulcus (these species mimicking some Hucnemide 
in their structure. 
The present species belongs to the second of these groups, and 
is distinguishable by exceptionally good characters, among which 
the most noticeable are the remarkably convex—strongly protu- 
berant—middle part of its prosternum, and the umbilicated punc- 
tures of its prothorax (inside each of which there appears to be a 
small granule). 
Lake Callabonna ; taken by Mr. Zietz. 
M. inamenus, sp.nov. Modice angustus; sat parallelus ; minus 
nitidus ; pube fulva vestitus ; supra obscure brunneus, cor- 
pore subtus ferrugineo, antennis palpis pedibusque testaceis ; 
capite postice longitudinaliter carinato ; antennarum articulo 
3° quam 2"S vix longiori, quam 5* duplo breviori; prothorace 
trans angulos posticos quam longiori subangustiori, leviter 
canaliculato (canali antice sat obsoleto), confertissime vix 
aspere punctulato, angulis posticis parum divergentibus 
bicarinatis (carina interna sat forti minus abbreviata) ; 
elytris ad apicem sat rotundatis (angulo suturali brevissime 
acuto), punctulato-striatis, interstitiis leviter convexis sub- 
D 
