284 Transactions.—Zoology. 
The Mimopeus amaroides, Pascoe, judging from description, will be the 
same as the Cilibe elongata, Bréme. 
The genus Rygmodus, White, has been ahaa by Mr. C. O. Waterhouse 
(Journ. of Entom.”’ vy. p. 194) to belong to the Hydrobiide. 
The number of the now described New Zealand Heteromera amounts to 
but forty species, distributed in twenty-two genera; there are doubtless 
many more to come. 
Cilibe opacula, n. sp. 
Somewhat broadly oval, but little convex; brownish black, the elytra 
usually with a tinge of dark chocolate (or purplish) brown; subopaque. 
Head and prothorax finely and very closely punctured, the interstices 
(except on the epistoma and disk of prothorax) a little elevated and reti- 
» culate; epistoma broadly truncated in front, the angles rounded, the suture 
- strongly marked — at each side: prothorax deeply arcuately (sometimes 
slightly sinuously) emarginate in front; front angles prominent, subacute, 
slightly convergent ; base more or less strongly bisinuate-emarginate ; the 
hind angles more or less produced, acute, directed behind or sometimes a 
little outwardly, reposing on the shoulders of the elytra ; sides gradually 
narrowing in a slight curve from base to apex, sometimes (Fem.,?) subparallel 
from the base to a little beyond the middle, thence rapidly curvedly nar- 
rowed to the apex ; usually they are very slightly sinuous in front of the 
hind angles ; disk very moderately convex, lateral margins rather broadly 
expanded, a little reflexed or concave, and unequally thickened at the edges; 
base and apex more or less distinctly margined or thickened at each side, 
sometimes throughout at the apex; a more or less distinct, transverse, 
angulate impression at each side of the middle, close to the basal margin ; 
scutellum transversely curvilinearly triangular, closely punctured : elytra 
more or less sinuate-truncate (and a little wider than base of prothorax) at 
the base ; a space, more or less open, between the base of the elytra and 
base of prothorax; sides very slightly rounded, more or less gradually 
narrowed from the middle to the apex ; expanded lateral margins wide, re- 
flexed or concave, transversely and somewhat reticulately rugose-punctate, 
and studded with very small granules; disk closely, finely, and rather uni- 
formly punctured, the interstices (especially at the sides) a little elevated and 
reticulate and studded with indistinct minute granules; a series of narrow 
longitudinal coste more or less indicated, and an irregular row of rugged 
foyer, just within the expanded margin, not extending to the apex: under- 
side brownish-black, shining, finely punctured ; flanks of prothorax more or 
less strongly (especially basally) longitudinally rugose, the underside of the 
expanded lateral margins being transversely rugose: legs dark brown, 
shining; femora finely and not closely punctured; tibie closely submuri- 
