524 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io4 



Osgood, Wilfred H., and Conover, B. 



1922. Game birds from northwestern Venezuela. Field Mus. Nat. Hist. Publ. 

 210, zool. ser., vol. 12, pp. 19-47. 

 Peterson, Roger Tort 



1947. A field guide to the birds. 

 Phelps, William H. 



1944. Las aves de Perijd. Bol. Soc. Venezolana Cienc. Nat., vol. 8, No. 56, 

 pp. 265-338. 

 Phelps, William H., and Phelps, William H., Jr. 



1950. Lista de las aves de Venezuela, con suo distribucion, parte 2. Bol. Soc. 

 Venezolana Cienc. Nat. 

 Pinto, Oliv:iSrio 



1953. Sobre a colegao Carlos EstevSo de peles, ninhos e ovos das aves de 

 Bel^m (Pard). Papeis Avulsos do Dep. Zool., Secretaria de Agric, 

 Sao Paulo, vol. 11, No. 13, pp. 111-222. 

 Skutch, Alexander Frank 



1950. The nesting season of Central American birds in relation to climate and 

 food supply. Ibis, vol. 92, pp. 185-222. 

 Stresemann, Erwin 



1940. Zur Kenntnis der Wespenbussarde. (Pernis). Arch. Naturg., new ser., 

 vol. 9, p. 144. 

 Wetmore, Alexander 



1926. The migration of birds. 

 Wetmore, Alexander, and Phelps, William H. 



1950. Observations]on^the geographic races of the tinamou Crypturellus nocti- 

 vagus in Venezuela and Colombia. Bol. Soc. Venezolana Cienc. Nat., 

 vol. 13, No. 77, pp. 115-119. 

 Zimmer, John Todd 



1937. Studies of Peruvian birds; No. 27: Notes on the genera Muscivora, 

 Tyrannus, Empidonomous, and Sirystes, with further notes on Knip' 

 olegus. Amer. Mus. Novitates No. 962, pp. 1-28. 



