For one leg (the one showing the most variations) of each specimen of which both legs were studied, the number of variations that this leg had in common with every other leg (of all species) was determined. Then the number of variations in common between the two legs of one individual was compared with the number of variations in common between one leg of this individual and each leg of every other individual. See table 4. One leg of six of the eight specimens showed at least as many variations in common with a leg of another individual as with the other leg of the same individual. The two exceptions were T.p. 2R and T.c.a. 1R. Thus for most specimens there was as much variation in the muscles between the right and left legs of one individual as there was between individuals. Of the 50 muscle variations seven were found only in _T. pallidicinctus_ (eight legs), 16 were found only in _T. cupido_ (nine legs), and ten were found only in _Pedioecetes_ (six legs). Two were found in both species of _Tympanuchus_ (but not in _Pedioecetes_). Fifteen were found in both _Tympanuchus_ and _Pedioecetes_; of these, five were found in all three species studied, eight were shared by _T. pallidicinctus_ and _Pedioecetes_, and two occurred in _T. cupido_ and _Pedioecetes_. Nerves The lumbosacral plexus, femoral nerve, sciatic nerve, and tibial nerve all showed numerous individual variations. The peroneal nerve, however, was relatively constant. Variations in the obturator nerve were considered to be insignificant. See table 5. In all instances except one (of 40) the typical condition in _T. pallidicinctus_ was also the typical condition in _T. cupido_. In most of the legs of the latter the nerve to M. flexor cruris lateralis did not perforate M. caudofemoralis. In all instances except four the typical condition in _T. pallidicinctus_ was also the typical condition in _Pedioecetes_. These exceptions were: prefixation of the lumbosacral plexus, six roots of the sciatic nerve, femoral nerve formed mainly from S2 to S4 and two twigs to M. flexor ischiofemoralis. In all instances the typical condition in _T. pallidicinctus_ was also the typical condition for all species considered together. Certain legs showed a greater number of variations from the typical condition of the nerves than did others. The greatest number of variations was shown by P.p. 3L, which had 12. T.p. 1R and T.c.p. 1L both showed only one.