224 NORTH AMERICAN BIRDS. 



Yoiniy. Aliove gnv3'isli nmlicr-browii, the feathers hordorcd more or loss dis- 

 tinctly with rusty ; scapulars with large white spots, mostly concealed ; tail- 

 bands more distinct than in the adult. Beneath white, longitudinally striped 

 with dusky-hrown. 



1. N. fuscus. Middle toe shorter than the bare jjortion of the tarsus, in 

 tiont ; tarsal seutelhu fuscil into a continuous plate in the adult male. Tail 

 nearly even. Top of head concolor with the back ; tail merely fiuling into 

 whitish at the tip. Concealed white spots of the scapulars very large antl 

 conspicuous. Wing, 0.4') - 8.80 ; tail, o.TO - 8.20 ; culnion, .40 - .(iO ; tarsus, 

 1.85-2.25; middle toe, 1.10-1.55. Hub. Whole of North America and 

 Mexico. 



2. N. cooperi. Middle toe longer than the bare portion of the tarsus, in 

 front ; tarsal scutelhe never fused. Tail much I'ounded. Top of the head 

 much darker than the back ; tail distinctly tipped with white ; concealed 

 white spots of the .scapulars very small, or olwoletc. Wing, 8.50- 11.00; 

 tail, 7.50-10.50; culmen, .G0-.80; tarsus, 2.10-2.75; middle toe, 1.30-1.85. 

 Ilab. Whole of North America and Mexico. 



Adult. Rufous markings beneath, in form of detached bars, not 

 exceeding the white ones in width ; dark .slate of the pileum and 

 nape abruptly contrasted with the bluish-phunbeous of the back ; 

 upper tail-cover(s narrowly tipped with white ; scapulars with con- 

 cealed .spots of white. Yotiiiy. White beneath pure ; tibiio with 

 narrow longitudinal spots of brown. Wing, 9.00-11.00; Uiil, 

 8.00-9.80; culmen, .05 -.80; tarsu.s, 2.45-2.75; middle toe, 

 1.55-1.85. Hub. Eastern region of North America; Eiustern 

 Mexico var. cooperi. 



Adult. Rufous markings beneath, in form of Ijroader bars, con- 

 nected along the shaft, almost uniform on the breast ; black of the 

 pileum and nape fading gradually into the dusky plumbeous of the 

 back ; upper tail-coverts not tipped with white, and scapulars 

 without concealed .spots of the same. Young. White beneath 

 strongly tinged with oehraccous; tibiie with broad transverse spots 

 of brown. Wing, 8.50-10.00; tail, 7.50-10.50; culmen, .00- 

 .75; tarsus, 2.10-2.75; middle toe, 1..W-1.75. Hab. Western 

 region of North America ; Western Mexico . . \ar. mexicanus. 



Nisus fuscus ((tmel.) Kaup. 



8HABF-SHINKED HAWK. 



J-'uko fuscus, Gmei,. Syst. Nat. p. 283, 1789. — Lath. Ind. Orn. p. 43, 1790 ; Syn. I, 98, 

 1781 ; Gen. Hist. I, 283, 18:i. — Mill. Cini. Pliys. pi. xviii, 1796. —Daim). Tr. Orn. 

 H, 80, 1800. — SiiAW, Zobl. VII, 101, 1809. — Al'd. B. Am. pi. ecclxxia, 1821 ; Orn. 

 Biog. IV. .122, 1831. — Hrkw. (Wils.) Am. Orn. 685, 18ii2.— rj;Ai). B. Mass. Ill, 78, 

 1841. — Thomi-. Nat. Hist. Verm. p. 61, 1842. — Nutt. Man. 87,1833. Accipitcr 

 fuscus, BoNAP. Eur. & N. Am. B. p. r,, 1838 ; Consp. Av. 32, 1850. — Quay, List B. 

 Brit. Mus. 38, 1844 ; Gen. B. fol. sp. 4, 1844. —Cass. B. Cal. & Tex. 95, 1854 ; Troo. 

 Ac. Nat. Sc. Phil. 1S55, 279 ; Birds N. Am. 1858, 18. — SriitcKL. Orn. Syn. I, 108, 

 1855. — Woonii. Sitgr. Exp. Zuhi & Colorad. p. 61, 1853. — Coopeu & Suckley, P. 

 H. R. Rei>'t, VII, ii, 146, I860. — Heekm. Willianison's Rp)!. 33. — Newb. Williamson's 

 Rep. 74. — CdUEs, Pr. Ac. Nat. Sc. Phil. Jan. 1866, p. 7. — Blakist. Ibis, III, 1861, 

 317 (fresh eggs). — Guay, Hand List, I, 32, 1869. Aslur fuscus, Dk Kav, X. Y. 



