78 PROCEEDINGS OE THE ACADEMY OF 



ON NISUS COOPERI (BONAPARTE), AND N. GUNDLACHI (LAWRENCE). 



BY ROBERT RIDGWAY. 

 Nisus Cooperi. 

 Fulco cooperi, Bonap., Am. Orn. I. 1828, pi. 10, fig. 1 ; Ann. X. Y. Lye. II. 



433 ; Isis, 1832, 1137. Jameson, (ed. Wils.) Am. Orn. IV. 1831, 3. 



Peab. B. Mass. III. 1841, 78. Astur cooperi, Bonap., Comp. List, 



1838, 5. R. Z. 1850, 489. Consp. I. 1850, 31. Jard. (ed. Wils.) Am. 



Orn. 1840, 651. Accipiter cooperi, Dekay, Zool. X. Y. II. 1844, 18, 



pi. iv. f. 5. Gray, List Ac. B. M. 1848, 38. Gen. B. I. 1849, 29. 



Hand List, I. 18G9, 32. Cass. B. Cal. Tex. etc., 1854, 96 ; B. X. 



Am. 1858, 16. Heerm. Pac. R. R. Rep. VII. 1857, 31. Xewb. lb. VI. 



iv. 1857, 74. Max. Cab. Journ. VI. 1858, 13. Baird, Cat. N. Am. B. 



1859, No. 15. Brewer, X. Am. Oology, I. 1857, 20, pi. v. f. 55. Scl. 

 P. Z. S. 1859, 389. Coop. & Suckl. P. R. R. Rep. XII. ii. 1860, 145. 

 Blakist. Ibis, 1861, 317. Dresser, Ibis, 1865, 323. Cones, Pr. A. X. 

 S. Phila. 1866, 43 ; Key to X. Am. B. 1872, 212 ; Check List X. Am. 

 B. 1873, 67. Scl. & Salv. Ex. Orn. I. 1869, 170 (foot note) ; Norn. 

 Xeotr. 1873, 129 ; Gray, Hand List. 1. 1869, 170 ; Ridgw. Pr. A. X. S. 

 Phila. 1870, 141; B. N. W., 1875, 334. Adams, Rambles, 1873, 297. 

 Sharpe, Cat. Ace. B. M. 1874, 137. Nisus cooperi, Schl. Rev. Ace. 

 1873, 73. Ridgw. Cat. Falc. Mns. Boston Soc. May, 1873, 19 ; B. B. 

 & R. Hist. N. Am. B. III. 1874, 330. Falco stanleyi, Aud. B. Am. 

 1831, pis. 36, 141 ; Orn. Biog. I. 1831, 186. Cooperastur stanleyi, 

 Bonap. Rev. et Mag. Zool. 1854, 538. Accipiter mexicanus, Swains. 

 F. B. A. II. 1831, 45. Jard. (ed. Wils.) Am. Orn. II. 1832, 215. 

 Bonap. Consp. I. 1850, 32 (sub A. fuscus). Cass. B. Cal. Tex. etc. 

 1854, 96 ; Pr. A. X. S. Phila. 1855, 279 ; B. X. Am. 1858, 17. Strickl. 

 Orn. Syn. I. 1855, 109. Coop. & Suckl. Pac. R. R. Rep. XII. ii. 



1860, 146. Coues, Pr. A. X. S. Phila. 1866, 43. Gray, Hand List, I. 

 1869, 33. Cooper, Orn. Cal. I. 1870, 465. Nisus cooperi var. mexi- 

 canus, Ridgw. Cat. Falc. Mus. Boston Soc. May, 1873, 19 ; B. B. & 

 R. Hist. X. Am. B. III. 1874, 231. "Accipiter pileatus," Strickl. 

 Orn. Syn. I. 1855, 109 (in part not A. pileatusYig. 1824). Northern 

 Falcon, Lath. Gen. Synop. I. 1781, 79, Xo. 62 ( o ad.). Falco hye- 

 malis, j3. Gmel. S. X. I. 1788, 274 (9 ad.). 



Habitat United States, and table-lands of Mexico ; southward 

 (in winter) to Costa Rica and Veragua ; north (in summer), to New 

 Brunswick, the Saskatchewan, and Washington Territory. 



Diagnosis Wing, 8.70-11.00 ; tail, 7.80-10.50 ; culmen, .58-.80; 

 tarsus, 2.30-2.85; middle toe, 1.45-1.85. Fourth or fifth quill 

 longest; first equal to or shorter than tenth; outer five with inner 

 webs sinuated. Tail rounded. Tarsi distinctly scutellate. 



