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Figure
2. External anatomy of a male (top) and female
(bottom) snow fly, Chionea alexandriana,
drawn by Dr. George Byers. Knowing the external
morphology is vital to identifying species
and understanding why the flies are wingless.
Symbols: as--anal segment, h--haltere, mxp--maxillary
palp, pls--pleural suture, pn--pronotum, sc--scpe
of antennae, sp--spiracle (a breathing hole),
s--sternum (plates on belly of abdomen), t--tergum
(plates on back of abdomen), w--wing rudiment.
The long legs (shown on the cover) are not
included in these drawings.
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