74 Bartey, A New Broad-winged Hawk. aur 
The latter paratype is in immature plumage. 
The first mentioned paratype differs in coloration very little 
from the type, the most noticeable variation being the more evident 
banding of the upper tail coverts and flank feathers, noticed only 
when these are displaced. The second paratype as it is in the 
immature plumage, is characterized by a tail crossed on the exposed 
upper surface by three narrow and one wider sub-terminal dusky 
band, alternating with four wider dusky gray bands and a narrow 
tip of the same color. The lateral tail feathers show six dark bars, 
alternating with lighter ones, on their inner web. The feathers 
of the breast in particular, and of other parts to a less degree are 
definitely margined with rufous, so that a decided reddish cast is 
given to the under part of the body. Ata distance however, the 
immature bird cannot be distinguished from either of the other 
specimens which are adults. 
In reviewing the birds of prey of Iowa, my attention had been 
called to the occurrence of these dark plumaged individuals of the 
Broad-winged Hawk. 
Mr. Robert Ridgway described the first noticed specimen under 
the title “Description of a Melanistic Specimen of Buteo latissi- 
mus (Wils.),” in the Proceedings of the United States National 
Museum, Vol. IX, Oct., 1886, pp. 248-249. 
In 1912 Mr. F. L. Burns monographed this species B. platypterus 
platypterus in The Wilson Bulletin, Vol. XXIII, Nos. 3 & 4, 1911. 
In this monograph an adult male, B. platypterus iowensis, is 
described but not named, which was taken at Portage la Prairie, 
Manitoba, May 30, 1900. 
In the Proceedings of the Iowa Academy of Science, Vol. XIX, 
1912, pp. 193-194, the writer described the specimen which is 
here presented as the type of a new subspecies. 
Mr. Ridgway mentions that two other birds similar to the one 
he describes were seen by Mr. Preston in 1874 and 1884 respec- 
tively, near where the first bird secured in 1883 was taken. 
Mr. F. L. Burns says, “Worthen mentions one specimen from 
Minnesota, of a solid dark umber, showing dark bars on tail and 
primaries; and Seton another collected by A. Calder, April, 1907, 
Winnipeg, Manitoba, sex not stated.” He says also “On Feb. 23, 
1908, Mr. J. H. Riley saw a very dark bird pass almost directly 
