150 



Zoologica: N. Y. Zoological Society. 



[I; 6 



THREE CASES OF A SUPERNUMERARY TOE 



IN THE BROAD-WINGED HAWK, BUTEO PLATYPTERUS 



(VIEILL.). 



I have thought it worth while to put on record three sepa- 

 rate instances of an extra toe being present on the leg of a 

 Broad-winged Hawk, Buteo platypterus. While these may 



Fig, 48. Leg of Broad-winged Hawk from Illinois. 



prove to have no direct evolutionary significance as reversions or 

 as examples of polydactyhsm, still the occurrence of the phe- 

 nomenon in three individuals of the same species from widely 

 different localities appears to be more than a coincidence. 



