BIRDS OF NORTH AND MIDDLE AMERICA 279 



BUTEO ALBONOTATUS ABBREVIATUS Cabanis 



Southern Zone-tailed Hawk 



Adult (sexes alike) . — Similar to that of Buteo albonotatus albonotatus, 

 but somewhat smaller and without the slate tinge shown in some of 

 the latter. 



Immature (sexes alike). — Similar to that of Buteo albonotatus albo- 

 notatus, but smaller. 



Juvenal (sexes alike). — Similar to that of Buteo albonotatus albonota- 

 tus, but smaller. 



Natal down. — Not known. 



Adult male.— Wing 375-382 (379); tail 187-240 (210.3); culmen 

 from cere 21-24 (22.3); tarsus 69-72 (71); middle toe without claw 

 40-44 (42.7 mm.).*° 



Adult female. —Wing 382-405 (398.3); tail 205-217 (210.8); culmen 

 from cere 23-24 (23.7) ; tarsus 73-79 (75.4) ; middle toe without claw 

 43-45.4 (43.8 mm.).'' 



Range. — ^K-esident from Panama (Pearl Islands) south through 

 Colombia (Santa Marta district) , Venezuela, Trinidad, British Guiana, 

 Dutch Guiana, French Guiana, and Brazil (Para) to Peru (Lima) and 

 eastern Bolivia (Rio Aniser, North Chiquitos) ; everywhere scarce and 

 local. 



Type locality.— Upper Pomeroon, British Guiana. 



Buteo abbreviaius Cabanis, in Schomburgk's Reise Brit. Guiana, iii, 1848, 739 

 (Pomeroon, Brit. Guiana: ex Falco abbreviaius Lichtenstein, manuscript, in 

 Berlin Mus.). — Sclater and Salvin, Nom. Av. Neotr., 1873, 118, part 

 (Guiana). — Sclater, Proc. Zool. Soc. London, 1883, 348 (Lima, Peru; crit.) — 

 Salvin, Ibis, 1886, 72 (Brit. Guiana). — Chapman, Bull. Amer. Mus. Nat. 

 Hist., vi, 1894, 70 (Trinidad). — Salvin and Godman, Biol. Centr.-Amer., 

 Aves, iii, 1900, 59, part (Brit. Guiana; Peru).— Robinson and Richmond, 

 Proc. U. S. Nat. Mus., xxiv, 1901, 167 (La Guaira, Venezuela).— Thayer and 

 BANGS; Bull. Mus. Comp. Zool., xlvi, 1905, 144 (San Miguel Island, Bay of 

 Panama). — Todd and Carriker, Ann. Carnegie Mus., xiv, 1922, 150 (Bonda 

 and Mamatoco, Santa Marta, Colombia). — Groebbels, Der Vogel, ii, 1937, 

 299, in text (egg color), 



Buteo abbreviatiis abbreviatus Swann, Synopt. List Accip., pt. 2, 1919, 51, part 

 (Brit. Guiana; Surinam; Brazil; Venezuela; Bolivia); Auk, xxxviii, 1921, 3G0, 

 part (crit.). 



Buteo albonotatus abbreviatus Swann, Synop. Accip., ed. 2, 1922, 83 (Panama to 

 Brit. Guiana, Brazil, Bolivia, and Peru) . — Peters, Check-list Birds of World, 

 i, 1931, 232. — Belcher and Smooker, Ibis, 1934, 591 (Trinidad; rare res.; 

 eggs). — Roberts, Trop. Agr., xi, No. 4, 1934, 5 (Trinidad). — Griscom, Bull. 

 Mus. Comp. Zool., Ixxviii, 1935, 299 (Pearl Islands, Panama). — Pinto, 



^" Three specimens from Venezuela, Colombia, and Bolivia. The Bolivian bird 

 is much larger than the other two and may represent an undescribed form. 



*^ Three specimens from Venezuela and Colombia. Swann (Monogr. Birds 

 Prey, i, 1928, 408) records a female from Bolivia with a wing measurement of 

 455 mm. 



