176 



Leucopternis scotopterus Kaup, Contr. Orn. 1850, 69. — Pelz. Verb. Zool.-Bot. Ges. 



Wien, 1862, 19 ; Oru. Bras. 3.— Scl. & Salv. Ex. Orn. 1868 (syD. and ch. 



under text of L. semiplumheus)', Nom. Av. Neotrop. 119. — Salv. Ibis, 1872, 



242.— Gray, Hand List, i, 1869, 8. 

 Buteo {Leucopternis) scotopterus Eidgw. Pr. Boston Soc. N. H. 1873, 64. 

 Asturina scotoptera Schleg. Mus. Pays-Bas, Asturiu.E, 1882, 10, 



Hob. — Eastern and Northern South America, from Bahia to Bogota 

 (Sharpe). 



Wing, 11.60-12.40 ; tail, 6.80-7.70; culmeu, 0.80-0.95; tarsus, 2.90-3.20; 

 middle toe, 1.25-1.35. Fourth quill lougest ; first shortest. Adult: — 

 Head, neck, and entire lower parts white, pure beneath, tinged with 

 ash above; pileum and nape sometimes streaked with black, always (?) 

 with dusky shafts. Above, deep slate, with concealed white spot- 

 ting. Tail with the basal half dark slate, more or less barred with 

 white on the inner webs, the terminal half white, with a rather narrow 

 sub terminal zone of slate. 



Young. — " Differs from the adult in having the feathers of the head 

 and neck mesially streaked with slaty-black, the wing-coverts tipped 

 with white, and the white spots on the inner webs of the dorsal feathers 

 more conspicuous." — (Sharpe, I. c.) 



List of specimens examined. — In nius. Pbilad. Acad., 2 (Southern Brazil) ; Am. Mus., N. 

 Y., 1 ; Boston Soc, 2 ; total, 5. 



• LEUCOPTEENIS ALBIUOLLIS. 



Falco albicollis Lath. Ind. Orn. 1790, 36; Gen. Hist, i, 2.''i0.— Daud. Tr. Orn. ii, 112. 



Buteo albicollis Gray, List B. Brit. Mus. 1848, 38 ; Gen. fol. 1849, sp. 15. — Stkickl. 

 Orn. Syn. i, 18.55, 37.— Taylor, Ibis, vi, 1864, 180 (Trinidad and Veuez.).— 

 Gray, Hand List, i, 1869, 8. 

 Leucopternis albicollis Kaup, Isis, 1847, 210 ; Contr. Orn. 1850, 78. — Bonap. Consp. i, 

 1850, 19.— Pelz. Verb. Ges. Wien, 1862, 140; Orn. Bras. 1871, 3, 395.— Scl. & 

 Salv. Ex. Oru. 1868, 122 ; Nora. Av. Neotrop. 1873, 119.— Salv. Ibis, 1872,242.— 

 FiN,sciT, P. Z. S. 1870, :.55 (Trinidad). 

 Buteo {Leucopternis) albicollis Ridgway, Pr. Boston Soc. N. H. 1873, 64. 

 Tacliytriorcliis albicollis Bonap. C. R. xli, 1855, 651. 

 Asturina albicollis SciiL. Mus. P.-B. Astnrinfe, 1862, 9. 

 Urubitinga albicollis Sharpe, Cat. Ace. B. M. 18G9, 217. 

 Falco picatus Shaw, Zool. vii, pt. 1, 1809, 167. 



Buteo melanotus Vieill. N. D. W, 1816, 472.— Pucker. Rev. et Mag. 1850, 84. 

 Falco poecilonotus Temm. PL Col. 9, 1824. 



Buteo poecilonotus ViG. Zool. J. i, 1824, 440. — Steph. Zool. xiii, pt. 2, 47. — Less. 

 Man. i, 104; Tr. Orn. 81.— Cuv. Reg. An. ed. 2, i, 337.— Gray, Gen. fol. 1849, 

 sp. 19. — Leot. Ois. Trinid. 1866, 7. 

 Leucopternis pcecllonotus Bonap. R. Z. 1850, 481 ; Consp. 19. 

 White-necked Falcon Lath. Gen. Synop. Suppl. 1787, 30. 



Sab. — Northeastern South America, from Northern Brazil to Trinidad 

 and Bogota. 



Wing, 13.80-U.60; tail, 8.30-9.00; culmen, 1.00-1.05; tarsus, 2.80-3.25; 

 middle toe, 155. Third to fifth qaill longest; first shortest. Prevailing 

 color white, the wings and tail black ; back more or less spotted with 

 black, and pileum and nape sometimes streaked with the same. All 

 the feathers of the wings tipped with white. Tail white at the base 

 and end, the middle portion black, this black band of variable width, 

 sometimes occupying the greater portion of the tail, but occasionally 

 (in a specimen from Bagota) restricted to a subterminal band, about 

 2.50 inches wide. 



We have not seen a sufficient number of specimens of this species to 

 enable us to determine whether the remarkable difference in the mark- 

 ings of the tail observed between a Bogota specimen and others from 

 the Amazonian district are sufficiently constant to be of geographical im- 



