328 CIRCUS CYANEUS VAR. HUDSONIUS, MARSH HAWK. 



Circus hudmnius, Vieill., Ois. Am. Sept. i, 1807, 36, pi. 9.— Cass., III. i, 18.54, 108. — 



Brew., N. A. Ool. 1857, 42.— Cass., B. N. A. 1858, 38.— Newij., P. R. R. Rep. vi, 



1857, 74.— Kenn., ibid, x, 1859, pt. iv, 19.— Heerm., ibid. pt. vi, 33.— Coop. &. 



Suck., ibid, xii, 1859, 150.— Hayd., Rep. 18G2, 153.— Coues, Pr. Pbilii. Acad. 



18G6, 49.— EiDGW., Pr. Pliila. Acad. 1870, 141.— Stev., U. &. Gcol. Siuv. Ter. 



1870,462.- jNlERit., ihul. 1872, G98.— Sxow, B. Ivans. 1873, 2 ; and of most authors. 

 Circus (Stri(jiccj)s) hudsonius, Gray, Hand-list, i, 1869, 37, No. 3G5. 

 Strifjiceps hiidsouins, Bp., Consp. Av. i, 1850, 35. 

 Fafco nUginosus, Gai., Syst. Nat. i, 1788, 278.— Lath., Ind. Oi-n. i, 1790, 40.— Dai;d.,Ti-. 



Orn. ii, 1800, 173.— Sab., App. Frank. Juuru. 671.— WiLS., Am. Orn. vi, 1812, 



67, pi. 51, f. 2 {Marsh Hawl; Edw., pi. 291 ; Arct. Zool. ii. No. 105 ; Gen. Syn. i, 90). 

 Circus uliginosus, Vieill., Ois. Am. Sept. i, 1807, 37.— DeKay, N. Y. Zool. ii, 20, pi. 3, f. 6,7. 

 Circus (Sirifjiceps) idirjinosus, Kaup, Mus. Seuck. 1845, 258. 

 •Strigiceps uiif/inosus, Bp., List, 1838, 5. — Kaup, Mon. FaJc. Cent. Orn. 1850, 58. 

 Fako varicgatus, Gm., Syst. Nat. i, 1788, 276. 

 Circus varic(jatus, Vieill., Ois. Am. Sept. i, 1807, 37. 

 Falco albidus, Gm., Syst. Nat. i, 1788, 276. 



Faico buffouii, Gm., Syst. Nat. i, 1788, 277.— Daud., Tr. Orn. ii, 172. 

 Falco ci/ancus, vars. 3 et j, Lath., Ind. Orn. i, 1790, 40. 

 Falco ijlaucus, sub-cocruleus, et raouwjfs, Bartk., Tiav. 1791, 290. 

 Falco curopoijisius, Bosc. — Daud., Tr. Orn. ii, 1800, 110. 



Circus europogistus,\iFAiA.., Ois. Am. Sept. i, 1807, 36, j)l. 8. > 



Falco hyemalis var.. Lath., Ind. Orn. Suppl. 8 (Siriclland). 

 Falco wruginosus var., Shaw, Geu. Zool. vii, 117 {Strickland). 

 Falco jncatus, Shaw, Gen. Zool. vii, 167 {Stricldaud). 

 Falco cccsius, Ord, Guthrie's Geog. 2d Am. ed. 315. 

 Falco cyaneus, Bp., Am. Orn. ii, 30, pi. 12 ; Syn. 1828, 33. sp. No. 22 : Isis, 1832, 10.38.— 



NUTT., Man. i, 1832, 109.— Aud., Orn. Biog. iv, 1838, 396, pi. 356.— Peab., Rep. 



Orn. Mass. 1839, 82. 

 Circus cijaneus, Aud., Syn. 1839, 19. — Aud., B. Am. i, 1840, 10.5, pi. 26. — GiR., B. L. I. 



1844, 21.— WOODH., Sitgr. Rep. 1853, 61. 

 Butco {Circus) cyaneus? var.'? amcricanus, Sw. & Rich., F. B. A. ii, 1831, 55, pi. 29. 

 Circus cgatieus hudsouius, Schl., M. P.-B. 1862, Circi, p. 2. 

 Circus cijaneus var. hudsouius, Allex, Bull. M. C. Z. iii, 1872, 181. — CouES, Key, 1872,210, 



fig. 159.— B. B. &. R., N. A. B. iii, lti74, 214. 



c. cinereus. 



Circus cinereus, Vieill., Nouv. Diet. d'Hist. Nat. ix, 1816, 454; Enc. Meth. iii, 1213. — 



Darw., Voy. Beag. iii, 30.— D'Okbig., Syn. Av. Mag. Zool. 1837; Voy. Am. 



Merid. 110.— Bridges, P. Z. S. ix, 109; Ann. Nat. Hist, xiii, 500.— Gray, Gen. 



of B.; List B. Br. Mus. 80.— Strickl., Orn. Syn. 1855, 254. 

 Circus cyaneus var. cinereus, Ridgw. — B. B. & R., N. A. B. iii, 1874, 214. 

 Circus compestris, Vieill., Euc. Meth. iii, 1213. 

 Circus histriouicus, Quoy, Zool. Jouru. ii, 271.— KixG, ifcK/. 425; Isis, 1830, 1182; Voy. 



Beag. i, 532.-Less., Tr. Oru.85. 

 Falco histriouicus, QuoY, Voy. Uranie, 93, pi. 15, 16. 

 Strigiccjjs histriouicus, Bp., Consp. Av. i, 1850, 35. 

 Spiziacircus histriouicus, Kaup, Mon. Falc. Cont. Orn. 1850, 59. 



Rah. — Europe, Asia. Var. hudsonicvs throughout North America. Var. cinereus in 

 .South America. 



List of specimens. 



Lieutenant Warren's Expedition. — 51C0, Cedar Island; 51 Gl, Fort Randall, Dakota; 

 5162, Running Water. 



Later Expeditions. — 59841, Colorado ; 60339-41, Wyoming ; 60625, Uintah Mountains; 

 60626-7, North Platte River; 62237, Idaho. 



With this species I begin an account of our diurnal Reptorcs that 

 might be indeiinitely prolonged were I disposed to enkirge upon " natu- 

 ral affinities" at the reader's expense. Mr. William Swaiuson, an ingen- 

 ious aud not entirely unimaginative writer, who entertained peculiar 

 ideas and was not fastidious in choosing the means to ui)h()ld them, 

 found the Marsh Hawk a more attractive, if not a more prolitable, sub- 



