151 
GAMPSOXYX SWA1NSONI. 
Gampsoni/x sioainsoni Vig. Zool. Journ. ii, 1825, G9 ; Isis. 1850,840.- 
i826.— Less. Man. i, 1828, pt. 2,36.— Swains. Classif. B. i, 
Gray, Gen. 1st ed. 4; 2ded. 5; fol. i, 1845, 2(3, pi. 9, fig. 4; 
1844,46; Gen. & Subgen. 1855, 6; Hand List, i, 1869, 28 
Reis. Br. Gnian. iii, 1848,735.— Boxap. Consp. i, 1850, 21.— 
i, 1855, 137.— Burm. Th. Bras, ii, 1856, 114.— Leot. Ois. T 
Scl. & Salv. P. Z. S. 1869, 252 (Maruria, Venez.).— Finsch 
(Trinidad).— Pelz. Orn. Bras. 1871, 6, 398.— Scl. & Salv 
121.— Sharpe Cat. Acc. B. M. 1874, 340. 
Elan us (Gampsonyx) sicainsoni Eidgway, Pr. Boston Soc. N 
Elanus sicainsoni Kaup, Conti 1 . Orn. 1850,59.— Schl. Mus. P 
Nor t us rufifrons Boie, Isis, 1828, 314. 
Falco rufifrons Max. Beitr. Orn. Bras, iii, 1830, 123. 
Chondrohierax rufifrons Less, (teste Sharpe). 
Elanus torquatus Less. Tr. 1831, 72.— Pucheil R. Z. 1850, 14. 
-Stepii. Zool. xiii 
1837,301; ii, 210- 
List B. Brit. Mns. 
,—Caban. Schoinb. 
Strickl. Orn. Syn. 
rinidad, 1866, 41.— 
, P. Z. S. 1870, p. — 
. Nom. Neotr. 1873, 
. IL, 1873,54. 
,-B. Milvi, 1862,9. 
YYing, 5.50-6.30; tail, 3.50-4.30 ; culmen, 0.45-0.50; tarsus, 0.85-0.95; 
middle toe, 0.75-0.80. Adult :—Forehead and auriculars straw-yellow; 
lower parts white* 1 with a yellowish wash, most pronounced on the sides 
where there is frequently a tinge of rufous; tibiae, axillars, and lining of 
the wing ochraceous. A patch covering the crown and occiput, and 
surrounding the eyes, a spot on each side of the breast, with the entire 
upper parts brownish-black or dusky-plumbeous; nuchal collar, sides, 
and tlanks chestnut-rufous, the former with a white one above it, below 
the dusky of the occiput. Young: —Similar, but nuchal collar entirely 
white, and feathers of the upper parts usually with rusty borders. 
List of specimens in United States National Museum. 
Catalogue- 
number. 
Condition 
of speci¬ 
men. 
Sex and 
age. 
Locality. 
From whom received. 
13684 
M. 
— ad. 
New Granada (Savanilla). 
J. Akburst. 
Other specimens examined .—In mus. Pkilad. Acad., 4; Boston Soc., 3; Mus. Comp. 
Zool., 2 ; G. N. Lawrence, 1; total, 11. 
vertical; cere very narrow and compressed on top. Tarsus considerably longer than 
middle toe ; web between outer and middle toes just appreciable. Tarsus and toes 
covered uniformly with rough or granular scales of hexagonal or nearly square form ; 
only the terminal joint of the toes with transverse scute!lie ; claws rounded beneath. 
Wing very long, swallow-like, the first primary much the longest, and none sinuated 
on either" web. Tail tern-like, nearly equal to wing, forked to about one-half its 
length, the outer feathers much attenuated. Colors, ashy above, white beneath. 
