Further information on fly morphology can be found via Wikipedia and this Italian Diptera site.
Main parts of a fly
Head of a fly
Parts of the head
Bristles of the head
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The thorax
Thorax in top view
Thorax in side view
McAlpine terminology
Wing venation
Complete venation
This wing has all the veins that were thought to be present in a primitive fly. No known fly has such complete venation, although some tipulids (craneflies) come close.
Reduced venation of a "higher fly"
Wing of Calliphora (Calliphoridae) showing the reduced venation typical of "higher" flies.
Legs
Parts of the legs
Orientation of bristles
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Foot
