180 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



(Nevada City, Calif.).— Gibbs, U. S. Geol. and Geogr. Surv. Terr., Bull. 



5, No. 3, 1879, 490 (Michigan; common summer res.). 

 Accipeter fuscus Boies, Cat. Birds Southern Michigan, 1875, No. 130 (s. Michigan; 



res.), 

 Nisus pileatus (not Accipiter pileatus Vigors) Katjp, in Jardine's Contr. Orn., 



1850, 64, part. 

 Accipiter pileatus Strickland, Orn. Syn., i, 1855, 105, part. 



ACCIPITER GUNDLACHI Lawrence 



GuNDLAcu's Hawk 



Adult male. — Similar to A. cooperii, but with breast and sides of 

 neck plain ash-gray; lower part of breast and upper portion of ab- 

 domen plain rufous, the feathers narrowly margined with white; 

 tibiae rufous, the feathers with subterminal darker bars and lighter 

 tips; forehead, crown, and occiput sooty black; upper plumage dull 

 bluish ash, the feathers of the back with brownish margins; tail of 

 the same color as the back, partly tinged with dull rufous and crossed 

 with four brown bars, three of which are imperfect, being but little 

 developed on the outer webs; the outer bar, however, crosses both 

 webs and is narrowly tipped with white; remiges brown, having the 

 shafts, as are also those of the rectrices, reddish brown; cheeks dusky 

 ash; space forward of the eye pale dull rufous; a line of whitish feathers 

 runs along the edge of the crown and extends over the eye; throat 

 ashy white tinged with rufous; sides of the neck, upper part of the 

 breast and a band running to the hind neck, grayish ash; lower portion 

 of the breast and upper part of the abdomen rufous, the feathers very 

 narrowly edged with dull white, lower part of abdomen of a paler 

 rufous, with transverse bars of dull white; long feathers of the sides 

 grayish ash tinged with rufous and destitute of bars or spots; sides 

 just above the junction of the tail plain rufous; thighs of a bright but 

 rather pale rufous, the feathers having darker submarginal ends, ter- 

 minatmg with very narrow edgings of dull white; under wing coverts 

 and axillars bright rufous marked with white ; the feathers of the throat, 

 breast, and sides have their shafts dark brown; upper tail coverts 

 grayish ash, lower tail coverts white; bill horn color, with a whitish 

 mark on the tooth and also on the edge of the lower mandible near its 

 base; cere and orbital space greenish yellow; iris red; feet pale greenish 

 yellow. 



Adult female. — Similar to the male but with the upperparts without 

 a bluish cast, with underparts more heavily marked and streaked, 

 less barred with sayal brown or snuff brown, and with wider, more 

 conspicuous blackish shaft streaks; chin and throat heavily streaked 

 with hair brown. Feet somewhat heavier. 



Immature. — Similar to that of A. cooperii, but darker and more 



