Although a high flier, yet it very frequently
alights on the trunks of trees. On these occasions its head is
invariably placed downwards; and its wings are expanded in a
horizontal plane, instead of being folded vertically, as is
commonly the case. This is the only butterfly which I have ever
seen that uses its legs for running. Not being aware of this fact,
the insect, more than once, as I cautiously approached with my
forceps, shuffled on one side just as the instrument was on the
point of closing, and thus escaped. But a far more singular fact is
the power which this species possesses of making a noise. (2/6. Mr.
Doubleday has lately described (before the Entomological Society,
March 3, 1845) a peculiar structure in the wings of this butterfly,
which seems to be the means of its making its noise. He says, "It
is remarkable for having a sort of drum at the base of the fore
wings, between the costal nervure and the subcostal. These two
nervures, moreover, have a peculiar screw-like diaphragm or vessel
in the interior." I find in Langsdorff's travels (in the years
1803-7 page 74) it is said, that in the island of St. Catherine's
on the coast of Brazil, a butterfly called Februa Hoffmanseggi,
makes a noise, when flying away, like a rattle.
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