98 



PROCEEDINGS OF THE ACADEMY OF 



with a narrow subterminal dusky band. Upper parts blackish- 

 brown, much variegated, especially on the wing-coverts, scapulars, 

 and upper tail-coverts, with reddish-ochraceous or rufous. Lower 

 parts deep ochraceous, the sides of the breast, sides, and abdomen, 

 with large, longitudinal, cuneate spots of brownish-black ; middle 

 of the breast with narrow lines of the same ; tibia? and crissum 

 with large hastate spots of rusty. Young ?. Tail whitish-ash, 

 becoming paler basalty, mottled with darker and with a badly de- 

 fined subterminal band of dusky. Entire back and scapulars plain 

 bright rufous, and the wiug-coverts, rump, upper tail-coverts, and 

 head and neck, much tinged with the same. 



A young female in Mr. Lawrence's collection differs only in the 

 coloration of the lower parts, the ground-color of which is ochra- 

 ceous-white ; the pectoral area is immaculate ; the abdomen, sides, 

 flanks, tibiae, and crissum are barred with rusty the bars nar- 

 rower on the tibia?, and more distant on the crissum; there is a 

 distinct rictal " moustache" of black. 



Material examined. U. S. National Museum, 7 ; Mus. Academy 

 of Natural Sciences of Philadelphia, 4; Mus. Comparative Zoology, 

 Cambridge, 2 ; Mus. Boston Society of Natural History, 3 ; Mus. 

 G. N. Lawrence, Esq., 1. Total number of specimens examined, 16. 



Measurements. 



4. Buteo (Craxirex) albicaudatus. 



Aquila coliblanca Azara, Apunt. I. 1802, 69. Buteo albicaudatus, Vieill., 

 N. D. IV. 1816, 477. Pucher. Rev. et Mag. 1850, 87. Strickl. Orn. 

 Syn. I., 1855, 35. TachytriorcMs albicaudatus, Sharpe, Cat. Ace. 

 B. M. 1874, 162. Spizaetus leucurus, Vieill., N. D. XXXII. 1819, 

 59. Buteo leucurus, Lafr., R. Z. 1849, 100. Falco pterocles, Temm., 

 PI. Col. I., 1823, pis. 56 (adult), and 139 (young). Buteo pterocles, 

 Less., Man. I., 1828, 103. Gray, Gen. I., 1849, 12; Hand List, I., 

 1869, 8. Caban. Schom. Reise in B. Gui. III., 1848, 739. Burm. 

 Th. Bras. II. 1855, 49. Schl. Mus. P.-B., Buteones, 1863, 13; Rev. 

 Ace. 1873, 110. Pelz. Orn. Bras., 1871, 3, 396. Scl. and Salv. Norn. 

 Neot., 1873, 119. Tachytriorchs pterocles, Kaup, Class. Saiig. Vog., 



