i Pei tia Battey, A New Broad-winged Hawk. 73 
DESCRIPTION OF A NEW SUBSPECIES OF THE 
BROAD-WINGED HAWK. 
BY B. H. BAILEY. 
Buteo platypterus iowensis, subsp. nov. 
Iowa BROAD-WINGED HAWK. 
DerscripTion.— Head, neck, body, and tibial flags, sooty brown with a 
slightly rufous cast due to very faint rufous edgings on the feathers. Back, 
and top of the head, somewhat darker. The feathers of the upper surfaces 
of the wings slightly worn and somewhat lighter at their margins. Con- 
cealed bases of the feathers of the head, snow white; elsewhere bases of 
the feathers grayish white. Each feather shows a distinct black shaft. 
Under tail coverts when disturbed show three or four alternating light 
and dark bands. 
Wings: Three outer primaries deeply emarginate on the inner webs. 
Lining of the wings in general the same color as the body, except at the 
bases of the first three or four primaries of each wing, where there are a 
very few whitish feathers, each crossed by about four dusky bands. Ex- 
posed parts of the primaries dusky above with no evident banding; below, 
however, they are whitish on the inner webs, and crossed by five narrow 
dark bars. The tips of the primaries from below for an inch and a half 
appear almost black. 
Spreading the secondaries they show from above, on their inner webs, 
sharp contrasting bars of white and dusky, which appear much less dis- 
tinct on the under surface. 
Tail: Exposed surface above crossed by three dark bars of the same 
color as the back, which alternate with two narrower grayish white bands 
with a narrow tip of the same color. From below, these markings are less 
distinct. The inner webs of the outermost tail feathers show more numer- 
ous indistinct bars. 
MEASUREMENTS OF TypE.— Length (skin) 16.50 in. 41.8 cm.; wing, 
11.62 in. 29.5 cm.; tail, 7.18 in. 18 cm.; tarsus, 2.44 in. 6.2 cm.; culmen, 
.80 in. 1.9 em. 
Type No. 918, Coe College Museum, Cedar Rapids, Iowa; sex (?); 
locality, Eagle Lake, Hancock County, Iowa; date, Fall 1907; collector, 
James Ward. 
Paratype, No. 45, collection of W. Kubichek, lowa City, Ia., sex, male; 
locality, lowa City, Iowa; date, April 21, 1913. 
Paratype, collection of A. J. Anderson, Sioux City, lowa; date, Octo- 
ber 30, 1893; sex (?); locality, 12 miles east of Des Moines, Iowa; col- 
lector, A. J. Anderson. 
