298 



NDUTII AMKltlCAN IJIliDS. 



botli ol' wliit'li holoiii,' (() Niiitli Auu'i'ica, oiio of tlicm (.1. iai/dpn.'i) lioiii^' 

 fouiul also ill Kiiiopi! iiiid Alricu. Tliosu iUWvv very cdiisiilunilily IVoin each 

 other, in the details of external structure, lU'obably (|uite as nuu li as tlicy do 



..^' 







64338,f. 



■5|#v, 



i/ „.f 



M338, 91. 



54338, < 



64338 



S4338,f 



MSSfl, Arrhibuteo lagopus. 



41720. A. ffrnii^htftis. 



from the Asiatic forms above mentioned. The following synopsis will ex- 

 press the difl'ei'ences between the two North American species, and between 

 the American and European races of the one common to both continents. 



Species and Races. 



Common Characters. Tail iiunv or k'sy white Imsall}- ; inner wel)s of the pri- 

 maries wliiie, without bars, anterior to their einargination. Head and neel< 

 witli lon.E;itiKlinal streai<s of wliitish and dusky (exeeiit in melanistic indivi(hinls 

 of la^/o/inii var. .iniirli-Ji)hcmnis). 



1. A. ferrugineuB. Winu-, lo.'JO- 17.110; tail, 9.r>0-ll.t)0: culuion, 1.00- 

 1.20; tarsus, 3. 10 -.■5.4."); niid.lle too, 1.40-1.G;J. Hill wide, the ba,«e very 

 broad and depressed. Beneath, cnntinuous pure white, without lonspicnons 

 spots, except .sometimes a I'cw scattered ones alonp the sides and across the 

 abdomen ; breast innnaculate. or with only narrow .shaft-streaks. Upper 

 parts always with more or less rufous. Adult. Upper parts and tibiae 



