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They have only two nerves, neither of which reaches so far as the tips; one of them runs close to the costal margin, and is much thicker than the other, which branches off from its base and skirts along the inner margin; behind the wings is attached a pair of minute halteres of peculiar form.
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." Catherine's on the coast of Brazil, a butterfly called Februa Hoffmanseggi, makes a noise, when flying away, like a rattle.
It is mixed costal and diaphragmatic accompanied by a slight raising of the clavicle. As the air is taken into the lungs and the framework of the ribs expands, the dome of the diaphragm, naturally, and as if voluntarily, descends and, at first, the walls of the abdomen extend or are pushed outward.
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