Moths have a frenulum, which is a wing-coupling device. Butterflies do not have frenulums. Frenulums join the forewing to the hind wing, so the wings can work in unison during flight.
>>fb-RQJR8P8N (OP) Stout, single but composite (i.e. fusion of several bristles) frenulum of a male hawkmoth, Nephele comma, as visible when the fore wing is pulled back. It arises from a sclerotized base at the humeral angle of the hind wing, and fits behind a membraneous hook, called the retinaculum, on the ventral side of the fore wing. In hawk moths, the females have three (rather than one, groups of) bristles, but these are also attached to a sclerotized frenulum base as in males.
Very cool, I am an avid moth fan. I guess this implies moths take longer flights and need speed more?
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