REVISION OF THE NYCTOZOILIDES. 153 
Anterior tarsi with basal joint much wider than and as long as 
the next two combined, posterior tarsi with basal joints as long 
as the rest combined. 
Fem. : Larger and more nitid than $ , thorax wider, transverse 
sutural markings less evident, the faint elytra! markings even 
more obscure, the posterior tibiae tomentose at the apex only, 
basal joint of anterior tarsi less enlarged, posterior tarsi with 
claw joint longer. 
Dimensions of (J, 23 x 14 mm. ; 9 > 24 x 14.5 mm. 
Habitat : South Australia (Overland Route of Railway to Kal- 
goorlie); West Australia — Sandstone, Lawlers District. 
Two specimens have been examined — the male taken by Mr. 
H. Deane, M.Inst, C.E., on his survey of the railway route, the 
female kindly sent by Mr. C. J. Clayton. The slight differences 
noted in the two specimens are, I think, only individual or sexual 
variations, while the shape of the head, somewhat as in Ptero- 
helceus cum ut us, Mack, alone clearly distinguishes it from what 
I take to be 0. heroina, Blackb. (a specimen of which I have from 
Shark Bay), which is its nearest ally. The following are the chief 
points of difference in my specimen of 0. heroina, Blackb. : — 
0. heroina, Blackb. : Epistoma trilobed, not angulate, canthus 
rounded, submentum with tooth bifid, or at least not entire at 
apex, tubercle on front of prosternum much larger, lateral channel 
of pronotuni narrower, its anterior angles less acutely produced, 
elytra with indefinite longitudinal scratch-like markings, the border 
and lateral channel slightly wider than in 0. bos. Both species 
present in general a smooth nitid black surface. 
(Since writing the above I have received two more specimens, 
which I consider conspecific with 0. bos. The first, A, from Kal- 
goorlie, is much smaller, 21x11 nun.; the other, B, from Shark 
Bay (whence my specimen of 0. heroina came), is 24 x 14 mm. A 
also differs in its lighter and more nitid colour (distinctly brown), 
and in its more rounded sides of prothorax, and may prove to be 
a distinct species. At present it may be noted as a variety.) 
ONOSTERRHUS DUBOULAYI n. sp. 
Oval, very convex, upper surface nitid black (with brownish 
tinge), beneath glossy black, oral organs, apical joints of antennae, 
