236 
not seen any species presenting that peculiarity.* P. laticollos 
has no characters assigned to it that seem really distinctive 
beyond that the prothorax is scarcely punctulate and the elytra 
has nine straight rows of punctures; characters which I cannot 
find in combination in any Jsodon before me. P. levigatus seems 
to be a peculiar species with the upper surface almost levigate 
and the clypeus not at all produced ; I have before me several 
species almost without puncturation on the upper surface, but the 
only one that has not some other strongly marked character 
(totally inconsistent with its being /ewvigatus) has the clypeus 
more strongly produced than in any other /sodow known to me. 
I find it difficult to believe that none of these three species are 
before me, and yet I am compelled to proceed on that assump- 
tion. 
Reiche has described one species (pecuarius). It is common 
and widely distributed, and is possibly identical with curtus, 
Burm. 
The remaining five species are Sir W. Macleay’s. Two of 
these (Heteronychust picipes and irregularis) are black species 
with two tubercles on the clypeal suture, which I am confident 
that I have not before me. One snecies (Heteronychus lucidus, 
from King’s Sound, N.W.A.) is described as having the pro- 
thorax of the male with a frontal tubercle but without any 
excavation; I have not seen this species. Jsodon picipennis 
(from King’s Sound, N.W. Australia) is described as being black 
except the elytra which are red, the prothorax impunctate except 
on the anterior and lateral margins and the elytra coarsely 
punctulate; I have not seen any species likely to be this one ; 
there is no information given regarding the claws of the male or 
the organs of stridulation, so I cannot place it. _Jsodon 
puncticollis is known to me, Mr. Masters having lent me a type. 
It appears, then, that of the 14 descriptions existing of species 
attributable to the genus Jsodon as I have characterised it above, 
one (and perhaps two) provides a synonym and that three are 
invalidated by their relating only to the female, so that only 
nine can be regarded as referring to decidedly distinct species 
* Since writing the above I have found among some Dynastides from W. 
Australia sent by Mr. Lea for my inspection a species which seems very 
likely to be J. curtus, Burm. The claws of its male are simple, and it has 
no organs of stridulation. It is quite distinct from all the species of Jsodon 
described or tabulated in this memoir, inter alia multa by its considerably 
smaller size. 
+ Through the courtesy of Mr. Masters I had the advantage some time 
ago of seeing an example of H. picipes, but did not take sufficient note of 
it tosay much about it now beyond that it is distinct from any of the species 
treated in the following pages. I can say, however, that one of the claws 
on the front tarsi of the male is bifid. 
