889 APPENDIX. 
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COUES KEY, 1884. UNION LIST, 1886. 
489. Circus cyaneus hudsonius. 331. Circus hudsonius. 
490. Rostrhamus sociabilis plumbeus. 330. Rostrhamus sociabilis. 
491. Ictinia subccerulea. 329. Ictinia mississippiensis. 
492. Elanus glaucus. 328. Elanus leucurus. 
493. Elanoides forficatus, 327. Elanoides forficatus. 
494, Accipiter fuscus. 332. Accipiter velox. 
495, cooper. 3938. cooperi. 
496. Astur atricapillus. 334. atricapillus. 
497, atricapillus striatulus? 33544, atricapillus striatulus. 
498. Falco sacer. 354a. Falco rusticolus gyrfalco. 
499. sacer obsoletus. 3540. rusticolus obsoletus. 
500. islandicus. BoA. rusticolus. 
501. candicans. 353. islandus. 
902. mexicanus, 355. mexicanus. 
503. peregrinus. 306. peregrinus anatum. 
504. peregrinus pealii. 306d. peregrinus pealei. 
505. columbarius. 357. columbarius. 
506. columbarius suckleyi? 3074. columbarius suckleyi. 
507. columbarius richardsoni. 308. richardsonii. 
508. sparverius. 360. sparverius, 
509. sparverius isabellinus ? 000. [Properly omitted from the List.] 
510. sparverioides. [361.] Falco sparverioides. 
511. fusciccerulescens. 399. fusco-ccerulescens. 
535. Polyborus auduboni. 362. Polyborus cheriway. 
363. lutosus. 
535 bis. Add: Polyborus lutosus. GUADALUPE CARACARA. As stated in the 
Key, p. 540, this species is quite distinct, nearly the whole plumage being barred. The 
diagnostic marks are tabulated by its describer as follows: ‘‘ Scapulars plain dusky brown. 
Tibi and flanks light isabella-color, barred with dark brown. Wing coverts (middle and 
greater) marked with wide bars of brown and pale isabella-color, of equal width. Tail- 
coverts and rump with broad bars of light isabella-color and grayish-brown. Tail with 
broad bars of pale isabella-color and grayish-brown, separated by zigzag lines of dusky. 
Abdomen isabella-color, with small sagittate bars of dark brown.”’ Wing 15.00-16.50; tail 
10.50-11.50; bill 1.25-1.35; tarsus 3.50-3.75. Guadalupe Island, Lower California. 
512. Buteo unicinctus harrisi. 335., Parabuteo unicinetus harrisi 
513. albocaudatus. 341. Buteo albicaudatus. 
514. cooperi? 714. cooper. 
515. harlani. 338. harlani. 
516. borealis. 3a7. borealis. 
Bia. borealis calurus. 337b. borealis calurus. 
518. borealis lucasanus. 337c. borealis lucasanus. 
519. borealis krideri. 337d. borealis kriderii. 
520. lineatus. 339. lineatus. 
339d. lineatus alleni. 
520 bis. Add: Buteo lineatus alleni. FroripA Rep-SHoutpErED Hawk. As stated 
in the Key, p. 546, there is much variation in size, Florida and Gulf specimens being very 
small. Such examples, having the wing 12.50 or less, tail 8.00 or less, etc., in the male, 
have received the above name. Pr. U. S. Nat. Mus., vii., Jan. 1885, p. 514. 
