FALCONID.E DIURNAL KAPTORES. 465 



brownish black. (Palest-colored specimens nearly or quite free from spots be- 

 neath; melanistic examples with dusky prevailing.) Male: Wing, 13.70-15. 25; tail, 

 7.00-9.00; tarsus, 2. 10-2.65. Female: Wing, 14.75-16. 50; tail, 8.80-9.00 ; tarsus, 2.50-2. 70. 

 5. B. latissimus. Size small (wing less than 12 inches), the tips of the closed 

 wings reaching only to the middle of the tail. Adult: Tail dusky, crossed by 2-4 

 broad bands of light brownish gray or brownish white, and narrowly tipped with 

 whitish. Upper parts nearly uniform dusky brown, darker on the back; lower 

 parts dull rufous brown varied by white spotting, the latter color prevailing pos- 

 teriorly. Young: Tail grayish brown, crossed by about 5-7 narrow bands of dusky 

 and tipped with whitish. Side of head and entire lower parts white or pale buff, 

 relieved by a more or less distinct dusky "mustache;" a dusky streak down 

 middle of throat, and various longitudinal markings of the same color on breast, 

 sides, etc. Male: Wing, 9.85-10. 70; tail, 6.50-7.00; tarsus, 2.15-2.80. Female: Wing, 

 11.00-11.40; tail,7.00-8.00; tarsus, 2.20-2.80. 



Buteo borealis (Gmel.) 



RED -TAILED HAWK. 



a. borealis. Eastern Ked-tailed Ha-wk. 



Popular synonyms. Chicken Hawk; White-breasted Chicken Hawk; Common Chicken 

 Hawk or Hen Hawk. 



Falco borealis GMEL. S. N. i, 1788, 266. WILS. Am. Orn. i, 1808, pi. 52, fig. 1. AUD. B. 



Am.i, 1831, pi. 51; Orn. Biog. i, 1831. 265. NUTT. Man. ed. 2, i, 1S40, 102. 

 Buteo borealis VIEII.L. 1816. NUTT. Man. i, 1832, 122. AUD. Synop. 1839,6; B. Am.i, 

 1840, 32, pi. 7. CASS. in Baird's B. N. Am. 185S, 25. BAIRD, Cat. N. Am. B. LS59. No. 

 23. COUES, Key, 1872, 216; Check List, 1874, No. 351; 2d ed. 1882, No. 516; B. N. W. 

 1874, 352. EIDGW. Norn. N. Am. B. 1881, No. 436. 

 Buteo borealis var. borealis B. B. & E. Hist. N. Am. B. iii, 1874, 282. 



Falco leverianus GMEL. S. N. i,1788, 266 (=young). WILS. Am. Orn. i.1808, pi. 52, fig. 2. 

 AUD. Orn. Biog. i, 1831, 265. 



HAB. Eastern North America to and including the Mississippi Valley; north to the 

 Fur Countries, south through eastern Mexico to Guatemala. 



b. calurus. Western Ked-tailed Hawk. 

 Popular synonym. Black Bed- tail. 



Buteo calurus CASS. Proc. Phil. Acad. vii, 1855 281; in Baird's B. N. Am. 1858, 14; ib. ed. 



1860, pi. 14. BAIRD, Cat. N. Am. B. 1859, No. 20. 



Buteo borealis var. calurus RIDGW. 1873. B. B. & E. Hist. N. Am. B. iii, 1874, 286. 

 Buteo borealis b. calurus COUES, B. N. W, 1874, 286. 

 Buteo borealis calurus EIDGW. Norn. N. Am. B. 1881, No. 4365. COUES, 2d Check List, 



1882, No. 517. 



Buteo montanus "NUTT." CASS. in Baird's B. N. Am. 1858, 26 (nee. NUTT.). BAIRD, Cat. 

 N. Am. B. 1859, No. 24. 



HAB. Western North America, from Eocky Mountains to the Pacific; north to Sitka, 

 Alaska; south to southern Mexico. 



c. krideri. Krider's Red-tailed Hawk, 



Popular synonyms. White Bed- tailed Hawk; White Hen Hawk or Chicken Hawk. 



Buteo borealis var. kridetri HOOPES, Proc. Phil. Acad. 1873, 283, pi. 5 (= young). B. B. 



& E. Hist. N. Am. B. iii, Ih74, 284. COUES. Che< k List, 1874, No. 351c. 

 Buteo borealis d. krideri COUES, B. N. W. 1874, 35:f. 

 Buteo borealis krideri EIDGW. Nom. N. Am. B. 1881, No. 436. COUES, 2d Check List, 



1882, No. 519. 



30 



