176 
Leucoptenns scotopterus Kaup, Contr. Orn. 1850, 69.— Pei.z. Verh. Zool.-Bofc. Ges. 
Wien, 1862, 19; Orn. Bras. 3.— Scl. & Salv. Ex. Orn. 1868 (syn. and ch. 
uncLer texl: of L. semiplumbeus ); Nom. Av. Neotrop. 119.*— Salv. Ibis, 1872, 
242.— Gray, Hand List, i, 1869, 8. 
Buleo ( Leucopternis ) scotopterus Ridgw. Pr. Boston Soc. N. H. 1873, 64. 
Asturma scotoptera Schleg. Mus. Pays-Bas, Asturime, 1S62, 10. 
Hal). Eastern and Northern South America, from Bahia to Bogota 
(Sharpe). 
Wing, 11.00-12.40 ; tail, 6.80-7.70; culmen,0.80-0.95; tarsus,2.90-3.20; 
mmdie toe, 1.25-1.35. Fourth quill longest; first shortest. Adult :— 
Head, neck, and entire lower parts white, pure beneath, tinged with 
ash above; pileum and nape sometimes streaked with black, always (?) 
vtth dusky .shafts. Above, deep slate, with concealed white spot¬ 
ting. lail with the basal half dark slate, more or less barred with 
white on toe inner webs, the terminal half white, with a rather narrow 
subterminal zone of slate. 
loung. “ Differs from the adult in having the feathers of the head 
anu 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, l. c.) 
List of specimens examined.—In mus. Pbilad. Acad., 2 (Southern Brazil); Am. Mus., N. 
i., 1; Boston Soc., 2; total, 5. 
LEUCOPTEBNIS ALBICOLLIS. 
Falco albicollis Lath. Iud. Orn. 1790, 36; Gen. Hist, i, 250.— Daud Tr Orn ii 112 
Buteo albicollis Gray, List B. Brit. Mus. 1848, 38; Gen. fol. 1849, sp. 15.— Strickl 
Orn. Syn. i li 855, 37.— Taylor, Ibis, vi, 1864, 180 (Trinidad and Venez.).— 
Gray, Hand List, i, 1869, 8. . ’ 
Leucopternis albicollis Kaup, Isis, 1847,210 ; Contr. Orn. 1850, 78.— Bonap. Consp i 
1850, 19.— Pelz. Verh. Ges. Wien, 1862, 140; Orn. Bras. 1871,3,395.— Scl & 
Salv. Ex. Orn. 1868,122 ; Nom. Av. Neotrop. 1873, 119.— Salv. Ibis 187 9 °42 — 
I insch, P. Z. S. 1870, 555 (Trinidad). ’ 5 
Buteo ( Leucopternis ) albicollis Ridgway, Pr. Boston Soc. N. H. 1873 64 
Tacky triorchis albicollis Bonap. C. R. xli, 1855, 651. 
Asturina albicollis Sciil. Mus. P.-B. Asturin®, 1862, 9. 
Urubitinga albicollis Sharpe, Cat. Acc. B. M. 1869, 217. 
Falco picatus Shaw, Zool. vii, pt. 1, 1809, 167. 
Buteo melanotus Vieill. N. D. iv, 1816, 472.— Puciier. Rev. et Mao-. 1850 84 
Falco poecilonotus Temm. PI. Col. 9, 1824. 
Buteo poecilonotus Vig. Zool. J. i, 1824, 440 .—Steph. Zool. xiii nf 9 47 t 
P g - A " ecl - 2 ’ '• 
Leucopternis poecilonotus Bonap. R. Z. 1850, 481; Consp. 19. 
White-necked Falcon Lath. Gen. Synop. Suppl. 1787, 30. 
Hal ).—Northeastern South America, from Northern Brazil to Trinidad 
and Bogota. 
Wing, 13.80-14.00; tail, 8.30-9.00; culmen, 1.00-1.05; tarsus 2.80-3.25* 
middle toe, 155. Third to fifth quill 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 Bogota) 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 
