Genera and Species of Coleoptera. 453 
second, and fifth or external, only, extending to the base, where they 
form strongly marked projections, and have an ochreous colour, the 
middle of the elytra with a darkish irregular band ; body beneath black, 
with scattered setaceous white hairs; legs pale brown, with white scale- 
like hairs. Length 2} lines. 
Nyctobates* Orcus. 
N. niger, nitidus; prothorace levigato, lateribus vix rotundatis, postice 
angulatim constrictis; elytris punctato-striatis ; prosterno lato, tricari- 
nato; tarsis validis. 
Hab. Western Australia. 
Black, shining; head and prothorax impunctate, the latter nearly as 
broad as the elytra, trapezoidal, the sides anteriorly slightly rounded, 
then nearly parallel to near the base, where it contracts at an angle ; 
scutellum triangular, below the level of the basal ridge of the elytra ; 
elytra ovate, scarcely broader than the prothorax at the base, punc- 
tate-striate, the punctures large, the striz shallow; body beneath 
glossy black; prosternum broad, marked with three strong rounded 
ridges, the lateral not united behind; legs glossy brownish black, tarsi 
stout, closely covered with bright-yellowish-ferruginous hairs. Length 
12 lines. 
Differs from NV. crenatus, Boisd., in the form of the prothorax, 
the punctate-striate elytra, stouter tarsi, and the prosternum strongly 
tricarinated throughout. 
Nyctobates feronioides. 
N. niger, nitidus; prothorace subtilissime punctulato, lateribus rotun- 
datis, postice incurvato-constrictis ; elytris punctato-striatis; prosterno 
angustato, leviter marginato; tarsis validis, brunneo-castaneis. 
Hab. New South Wales. 
Black, shining ; head and prothorax very minutely punctured, the 
latter narrower than the elytra, fully rounded at the sides, contracted 
and a little incurved posteriorly ; scutellum triangular, continuous with 
the basal ridge of the elytra; elytra oblong, broader at the base than 
the prothorax, the shoulders a little recurved, punctate-striate, the 
punctures rather small, but the striz deep ; body beneath glossy black ; 
prosternum narrowed, pointed behind, slightly margined ; legs brownish 
black, glossy ; tarsi stout, brownish chestnut. Length 7 lines. 
Besides the smaller size, this species differs from JV. crenatus, inter 
alia, in the deeper striz, more strongly, and not crenately, punctured 
elytra, and stouter tarsi. 
* Guérin-Méneville, Mag. de Zool. 1854, p. 33; Lacordaire, Gen. v. p. 371. 
This genus and the three following should have beeu placed after the Bolito- 
phagine. 
