80 FALCONID^. 



Nat. Mus. no. 4, p. 42 ' ; Ridgw. Bull. U. S. Geol. & Geogr. Surv. ii. p. 168 (part.) "; Sumichr. 



La Nat. v. p. 236 " ; Nutting, Pr. U. S. Nat. Mus. v. p. 404 '^ ; vi. p. 388 '^ 

 Urubitinga ridgwayi, Gurney, List Diurn. Birds Prey, pp. 77, 148''' ; Ridgw. Pr. U. S. Nat. Mus. 



X. p. 592"; Sharpe, Hand-1. Birds, i. p. 258 (1899) '". 

 Urubitinga urubitinga ridgwayi, Zeled. An. Mus. Nac. Costa Rica, 1887, p. 126"; Cherrie, Auk, 



1892, p. 328''; Bichm. Pr. U. S. Nat. Mus. xvi. p. 521". 



U. zonurce similis, sed caudse dimidio basali nigro, fascia angnsta alba divisa ; cera lorisque viridescenti-flavis ; 



pedibus flavis; iride brunnea. Long, tota circa 24-0, alas 16'2, caudae 10'6, tarsi 5-0. (Descr. ad. ex 



Coban, Vera Paz. Mus.nostr.) 

 Juv. Fusca, dorso et alis nigricante fasciatis ; capite, cervice et corpore subtus cervinis, nigro striatis ; tibiis 



albis nigro fasciatis ; cauda cervino-albida, fasciis irregularibus angustis fusco crebre transfasciata. 



(Descr. juv. ex Momotombo, Nicaragua. Mus. nostr.) 



Hab. Mexico, Presidio de Mazatlan(i^orrer), Mazatlan {Grayson^'^^), Colima [Xantus ^^), 

 Mirador {Sartorius i"), Orizaba i^, Cordova ^i, Santa Efigenia, Barrio, Tehuan- 

 tepec ^ ^^, Gineta Mountains ^, Tonala in Chiapas * ^* {Sumichr ast), San Andres, 

 Vera Cruz {Boucard ^, Bichardson), Chable, Buctzotz, N. Yucatan (Gaumer), 

 Merida (Schott^^^) ; British Hoi^ddeas, Cayo [Blancaneaux) ; Guatemala 

 {Skinner^), Coban, San Geronimo {0. S.), Savana Grande {0. S. & F. 1). G.); 

 HoNDUBAS, Segovia Eiver {Townsend'^^); Nicaeagua, Eealejo {J. M. Dow^^), 

 San Emilio, Lake of Nicaragua, Momotombo {Richardson), Sucuya {Nutting ^^), 

 San Carlos, Eio Escondido ( Wickham ^, Richmond ^^) ; Costa Eica ( Van Patten \ 

 San Jose(Caj'mo^5i°, Cherrie^^, Zeledon^''), Aguacate [v. Frantzivs^), San Mateo 

 {Zeledon'^'^), Pozo Azul, Miravalles {Underwood), Gulf of Nicoya {Nutting ^^). 



In JJ. ridgwayi the upper tail-coverts are white, as in U. zmura, but the marking 

 on the tail is different. The white band across the centre of the latter is not so broad, 

 and the base is black, crossed by a second narrow white bar. Young birds of the two 

 species are scarcely distinguishable ; the mesial marking on the feathers of the under 

 surface are, however, somewhat larger in TI. ridgwayi. 



In Costa Eica the ranges of U. zonura and U. ridgwayi appear to coalesce. 



Sumichrastii says that JJ. ridgwayi and JJ. anthracina have similar habits, both 

 frequenting the borders of rivers and streams. In Mexico the latter inhabits the warm 

 regions, but becomes rare in the more temperate country. 



They sometimes ascend to a great height when on the wing, describing large circles 

 and uttering a sharp cry, but on the ground they are easily approached. 



The food consists of small quadrupeds, young birds, reptiles, fish, Crustacea, and 

 insects. 



The nest is formed of small sticks, and is placed in the forks of the highest trees • 

 one found by Sumichrast about April 16th contained young birds covered with white 

 down. 



• This must be, we think, the locality called " Sonata" by Gurney '\ 



