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Unformatted text preview: is very acute but in butterflies it is often reduced, probably because their day-flying habits enable visual navigation. The proboscis is a fine tube which is used to suck up nectar or other fluids. When not in use the proboscis is coiled beneath the head. The feet carry taste receptors. If the butterfly lands on a suitable fluid, the proboscis uncoils. The head, body and legs are clothed with hairs, which are flattened and modified on the wings to form overlapping, pigmented scales, giving the wings their characteristic pattern. The scale colour may be produced by a bending of light rays through the scales so that they act like tiny prisms, or by pigment in the scales. The forewings overlap the hind wings so that in flight both pairs move together. Dr. N. Jago compound eye antenna coiled proboscis Papilio head leg antenna compound eye fore-wing hind-wing abdomen thorax Papilio demodocus D.G. Mackean...
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This note was uploaded on 11/29/2011 for the course BIO 218 taught by Professor Young during the Fall '11 term at BYU.
- Fall '11