24: Mr. G. R. Waterhouse on Coleopterous Insects 
fTydroporus before examined ; it however belongs to the Dytiscide 
as defined by Aubé, and agrees with Krichson’s genus Copelatus, 
excepting that its posterior tarsi are not ciliated... The hinder 
tarsi are provided with a few spines only: the three basal joints 
have each two large spmes at the apex, and there are besides some 
few yery minute spines on other parts. I have seen several spe- 
cies presenting this structure ; among others I may notice the 
Colymbetes elegans of Babington, an insect which I have had sent 
to me with the name Copelatus posticatus attached. Another 
species was brought by Mr. Darwin from the Mauritius; they all 
possess the sharp distinct striz to the elytra which are mentioned 
as characteristic of the genus Copelatus, and neither of the four 
specimens here alluded to have the slightest trace of dilatation of 
the anterior tarsi. 
The Galapagos species differs from the Colymbetes elegans of 
Babington (which 1s found both in Rio de Janeiro and im Colom- 
bia) in being smaller and proportionately rather narrower ; in 
having the legs of a paler hue (these being pitchy-black in C. ede- 
gans and pale testaceous in C. galapagoensis), and the strie of the 
elytra more perfect. In C. elegans the second stria from the suture 
is obliterated on the hinder half of the elytron ; the fourth, sixth, 
eighth and tenth are also obliterated, but continued for the most 
part to the hinder third. (or rather beyond that point) of the elytra. 
In C. galapagoensis the same strize are abbreviated, but the second 
and others mentioned, all terminate on the same line or nearly so, 
that lie being about the posterior fourth of the elytron. The tho- 
rax presents extremely delicate punctures, and numerous minute 
longitudmal scratches, requiring a tolerably powerful lens to per- 
ceive them ; they are most distinct towards the sides and hinder 
part of the thorax. Should this little section of water-beetles be 
not already characterized, I think it deserves the rank of a sub- 
genus, which might be called Chetosphyrus, from yairn, a bristle, 
and oupa, the ankle; the spines at the base of the foot being 
much developed. I may further add, that all the species have 
the anterior tibize somewhat dilated at the apex, and obliquely 
truncated on the outer side at the same part ; the truncated por- 
tion is provided with three or four spines. 
Section BRACHELYTRA. 
Creophilus, nov. spec. ?—Three specimens found under a dead 
bird in Chatham Island. These specimens approach very nearly 
in size and form to the Cr. maaillosus of Kurope, and the C. vil- 
losus of North America. They have scarcely any hairs either on 
the head, thorax or elytra, and are but sparingly clothed on, the 
meso- and metasternum ; the hairs on these last parts are how- 
