CIRCUS. 43 
smaller bird, and, in the adult dress, of a bluish-grey colour above. ‘The body is 
slender, the wings and tail long. ‘The legs are long and the tarsi slight. The middle 
toe is considerably longer than the others, the inner toe being longer than the outer. 
“1. Circus hudsonius. 
The Ring-tailed Hawk, Edw. Birds, iii. t. 107 7. 
The Marsh Hawk, Edw. Glean. Nat. Hist. ii. t. 291. f. 2”. 
Falco hudsonius, Linn. Syst. Nat. i. p. 128°. 
Cireus hudsonius, Vieill. Ois. Am. Sept. t. 9°; Scl. P. Z. 8S. 1857, p. 211°; 1859, p. 850°; 1864, 
p. 178"; Scl. & Salv. Ibis, 1859, p. 220°; P. Z. S. 1864, p. 349°; Lawr. Ann. Lye. N. Y. 
vil. p. 317°; ix. p. 184''; Dugés, La Nat. i. p. 1388"; v. Frantz. J. f. Orn. 1869, p. 370”; 
Salv. P. Z. S. 1870, p. 216“; Cat. Strickl. Coll. p. 483°; Sharpe, Cat. Birds Brit. Mus. 
1p. 55°; Gundl. Orn. Cub. p. 45'7; Sumichrast, La Nat. v. p. 235"°; Boucard, P. Z. S. 
18838, p. 456”; Ferrari-Perez, Pr. U.S. Nat. Mus. ix. p. 166*°; Herrera, La Nat. (2) 1. 
pp. 176, 820”; Cherrie, Auk, 1892, p. 328”; Fisher, Bull. U.S. Dep. Agr. no. 3, p. 26, 
t.3™; Bendire, Life Hist. N. Am. Birds, i. p. 183; Richmond, Pr. U.S. Nat. Mus. xvi. 
p. 521”; Allen, Bull. U. S. Nat. Mus. v. p. 84%; Jouy, Pr. U. S. Nat. Mus. xvi. 
p-. 787 *. 
Circus cyaneus, var. hudsonius, Ridgw. in Baird, Brew., & Ridgw. N. Am. Birds, ii. p. 214%; 
Lawr. Mem. Bost. Suc. N. H. ii. p. 298”; Bull. U.S. Nat. Mus. no. 4, p. 43°. 
Supra ceerulescenti-cinereus, uropygio albo: subtus albus, pectore griseo, abdomine toto maculis sparsis sagitti- 
formibus rufis notato ; tibiis aut albis aut plus minusve rufo fasciatis ; remigibus nigricantibus, subtus ad 
basin albis ; tectricibus et axillaribus vix griseo fasciatis ; cauda cinerea, nigricante subterminata, fasciisque 
sex incompletis transnotata: rostro corneo, pedibus flavis. Long. tota circa 19-0, alee 13°5, caudee 9-0, 
tarsi 3-0. (Deser. maris ex Chapulco, Puebla, Mexico. Mus. nostr.) 
3 juv. 2 similis, sed minor et subtus pallidior. 
 brunnea, uropygio albo; pileo, cervice postico, scapularibus et tectricibus alarum minoribus fulvo notatis ; 
superciliis et macula infra oculos cervino-albis, faciei disco fusco et fulvo intermixto: subtus fulva, 
pectore fusco striato; remigibus subtus albidis, cervino tinctis fusco transfasciatis ; subalaribus cervinis, 
fusco maculatis ; cauda fusca, rectricibus mediis fasciis pallidis notatis, rectricibus reliquis fasciis latis 
fulvis et fulvo terminatis: rostro corneo, pedibus flavis. Long. tota circa 20°0, ale 15-0, caude 10:0, 
tarsi 3°3. (Descr. feminee ex Duenas, Guatemala. Mus. nostr.) 
@ juv. Subtus omnino fusco striata. 
Hab. N. America generally ?°.—Mexico (7. Mann, Sumichrast'*), Rancheria de 
los Apaches (/obinette?*), Hermosillo in Sonora (Ferrari-Perez), Carichic in 
Chihuahua (W. Lloyd), Mazatlan (Grayson 7°), Soledad in San Luis Potosi (Jouy 27), 
Zacatecas (W. B. Richardson), Valley of Mexico (White", Herrera), Chapulco, 
Puebla ?°, San Baltazar, La Noria, Coapam (Ferrari-Perez), Guanajuato (Dugés!?), 
Santana near Zapotlan (W. Lloyd), Volcan de Colima (W. B. Richardson), Orizaba 
(Botteri®), Jalapa (de Oca), Oaxaca (Boucard®), Cacoprieto, Tehuantepec city 3° 
(Sumichrast), Izalam in Yucatan (G. F. Gaumer 1), Progreso (Devis) ; GUATEMALA 
(Constancia *), Duefas §, Quezaltenango, San Geronimo (0. 8. & F. D. G.), Atitlan, 
Panajachel (W. B. Richardson); Nicaraaua, Rio Escondido (Richmond >) ; 
Costa Rica, San José (Carmiol', Cherrie??), Candelaria Mts. (v. Hrantzius 38) ; 
6* 
