This and several of the following genera may be readily distinguished
from any of the preceding by having the anterior legs, in both sexes,
short and imperfect, the tarsi not being distinguishable into five
joints, but generally consisting of a single piece with several crowded
spines at the extremity. In the present genus there is a slight
indication of an articulated structure, but very indistinct, and there
are scarcely any projecting points in the room of claws. The antennæ,
which are placed very close to each other at the base, terminate in a
pretty thick club elongated and somewhat curved. The palpi, which stand
considerably apart from each other, are short, not rising above the
head, densely clothed with hair-like scales which completely conceal
the joints: of the latter the terminal one is minute and globular
ending in a point, the second long and thick, the radical one about
one-third its length. Outline of the upper wings triangular: claws
simple. Chrysalis suspended by the tail, and never supported by a band
round the middle.
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