@ Bat 
XXI. On some new genera and species of Heteromerous 
Coleoptera (Helopide) from Tierra del Fuego. 
By Cuas. O. WATERHOUSE. 
[Read 3rd November, 1875.] 
Most of the insects described in this paper were 
brought to this country by Mr. Charles Darwin. They 
were described by my father, many years ago, in a paper 
on the classification of the Heteromera. By a most un- 
fortunate accident this paper slipped, during its transport 
to the Entomological Society, from the wrapper in which 
it was enclosed, and was lost. 
The specimens have remained untouched until the 
present day, and in the following descriptions I have 
made use of the original dissections made by my father. 
The species are five in number, and, although they all 
approach the genus Helops, they differ so much in struc- 
ture and appearance that I have deemed it best to propose 
three new genera for their reception. 
They are all apterous, and one of them was found in 
some numbers in Tierra del Fuego, on the sea-shore, under 
stones that were covered to some depth at each high 
tide. 
The following are the descriptions :— 
Fam. HELOPIDZ-. 
Curroniscus, G. R. Waterhouse, MS. 
Mentum very small. Ligula truncate in front, with 
the angles rounded. Apical joint of the labial palpi sub- 
cylindrical, small, nearly as long as the two preceding 
joints taken together. Maxillary palpi with the penul- 
timate joint not longer than broad; the apical joint twice 
as long as the second, wider at its apex, but not securi- 
form. Mandibles bifid at the apex. Labrum transverse, 
not emarginate. Head not much narrowed behind the 
eyes; clypeus distinctly separated from the forehead by a 
TRANS. ENT. SOC. 1875.—PART IV. (DEC.) 
