(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.) Several times when a pair, probably male and female, were chasing each other in an irregular course, they passed within a few yards of me; and I distinctly heard a clicking noise, similar to that produced by a toothed wheel passing under a spring catch.

The noise was continued at short intervals, and could be distinguished at about twenty yards' distance: I am certain there is no error in the observation.
I was disappointed in the general aspect of the Coleoptera.