484 Bangs, Dichromatic Herons and Hawks. |Aj! t k 



Ardca herodias wardi Ridg. and Ardea wurdemanni Baird both 

 become synonyms of 



Akdea herodias occidentalis Aud. 



The West Indies Great Blue Heron, becomes 



Ardea herodias repens Bangs & Zappey, 



with Ardea herodias adoxa Oberholser as a synonym, and the 

 Cuban Green Heron, if really distinct from Butorides virescens 

 maadatus (Bodd.), of Martinique, which I doubt, becomes, 



Butorides virescens brunescens (Lemb.) 



with Butorides virescens etibanus Oberholser a synonym. 



The Hawks, now admitted by, I think, all bird anatomists to be 

 close relations of the Herons, show an array of color variation due 

 to melanism, erythrism and even albinism, such as no other group 

 of birds presents. The melanistic forms are so common, have 

 been so much discussed and are so well known that I shall pass 

 them by entirely here. 



The most sharply marked instance of dichromatism, that I know 

 in the Hawks, that is due to erythrism, is in the Cuban Sparrow 

 Hawk, Faleo sparvcrius sparveroides Vig. In Cuba and the Isle 

 of Pines, the normally colored pale birds and the reddish brown, 

 erythristic examples, are about equally common, occur everywhere 

 together, and breed, mated indiscriminately. 



An instance of albinism in the Hawks, which on account of the 

 tendency of the causes of this disease to be inherited, gives the bird 

 a semblance of geographical limitations like those of a subspecies, 

 is the famous white Goshawk of Kamchatka and parts of east 

 Siberia, Aceipiter ' gentilis albidus (Menzb.). This bird has recently 

 been discussed at length by Hartert, (Die Vogel der palaarktischen 

 Fauna, Vol. II, p. 1149), who points out that normally colored birds 

 do occur with it, as well as all intermediate stages, and who considers 

 it only an albinistic phase of Aceipiter g. schvedowi (Menzb.). 



I have no doubt myself that the White Goshawk of Australia, 

 Aceipiter novoo-hollandia? (Gmel.), is an albinistic phase of Aceipiter 

 cinereus (Vieill.) with which it occurs in the same regions. 



1 Aslur, of course, if one wants to recognize that genus. 



