128 
NISUS (?) POLIOGASTER. 
Falco poliogaster Temm. PI. Col. i, 1824, pi. 264 (ex Natterer M. S.). 
Astur poliogaster Yig. Zool. Journ. i, 1824, 338. —Stepii. Zool. xiii, pt. 2, 1826, 29.— 
Less. Man. i, 1831,93.—Cuv. Reg. An. ed. 2, i, 1829, 332.— Gray, Gen. B. i, 1849, 
27.— Strickl. Orn. Syn. i, 1855,121.— Sharpe, Cat. Acc. B. M. 1874,120. 
Nisus poliogaster Less. Tr. 1831,62.— Sciil. Mus. P.-B. Astures, 1862, 43; Rev. Acc. 
1873,96. 
Asturina poliogastra Kaup, Isis, 1847,198; Contr. Orn. 1850,67.— Bonap. Consp. i, 
1850, 30. 
Cooperastur poliogaster' Bonap. Rev. et Mag. Zool. 1854,538. 
Accipiter poliogaster Gray, Hand List, i, 1869, 33.— Pelz. Orn. Bras. 1871, 8. 
Sab. —Brazil. 
“ Adult male (type of species): Above dark leaden grey, the ear-coverts 
and sides of the neck uniform with the crown, which is slightly darker 
than the back, as also are the wing-coverts; upper tail-coverts tipped 
with clear ashy-grey; quills brown, with rufous brown shafts, the sec¬ 
ondaries leaden grey like the back ; the quills barred with darker 
brown, these bars showing more plainly underneath, where the lower 
surface of the wing is ashy white, inclining to pure white near 
the base of inner web ; tail black, tipped with whitish and crossed 
with three narrow bars of clear ashy grey, a little rufescent near 
the shafts; entire under surface, including the under tail-currents, 
pale grey, the throat and under wing-coverts whiter, the shafts darker, 
showing a hair-like stripe. Total length 17 inches, eulmen 0.85, wing 
9.8, tail 7.8, tarsus 2.15, middle toe 1.4. (Mus. Lugd.) v — (Siiarpe, l. c .) 
Regarding this very rare species, of which we have seen no examples, 
Mr. Gurney writes me as follows :—“ This species, which Sclilegel calls 
a ‘ Nisus f and Gray a ‘ Cooperastur ’, seemed to me, when I examined 
it at Leyden in 18G9, to be a Leucopternis. At first sight its appear¬ 
ance is a good deal like Mierastur mirandollei , # but from that species it 
is evidently generically distinct. The type-specimen at Leyden is the 
only one I have seen. The bird figured by Temminck as the young of 
this species is said by Sclilegel to be the young of Cooperastur pileatus. v 
(Vide Mus. Pays-Bas, Astures, p. 43.)i 
NISUS (?) PECTORALIS. 
Astur pectoralis Bonap. Rev. et Mag. Zool. 1850, 490.— Schr. Mus. P.-B. Astures, 1862, 
18.— Pelz. Orn. Bras. 1871, 6, 398; Rev. Acc. 1873, 63.— Sharpe, Cat. Acc. B. 
M. 1874, 121. 
Cooperastur pectoralis Bonap. Rev. et Mag. Zool. 1854, 538. 
Accipiter pectoralis Scl. Ibis, iii, 1861, 313, pi. x; Ibis, iv, 1862, 194.— Gray, Hand 
List, i, 1869, 33.— Scl. & Salv. Ex. Oru. xi, 1869, 170; Nom. Neotr. 1873, 
120.— Salvin, Ibis, 1874, 321 (Specimen in Mus. Pliilad. Acad). 
Hob .— Brazil (Ypenema and Borba; Natterer). 
“ Female, not quite adult .— Above brown, with tips of rather paler 
brown to the feathers of the middle back, scapulars, and secondaries; 
the greater part of the wing-coverts, the interscapular region, and the 
lower back, rump, and upper tail-coverts black, with white tips; crown 
of head crested, pure black; ear-coverts and sides of neck rich rufous, 
forming a broad collar round the back of the latter; feathers below the 
eye and a faintly-indicated lnoustackial streak black; throat white, a 
* This resemblance is so very close that we have seen specimens of the Micrastur 
labeled “ M. poliogaster Temm.” 
tNotwithstanding Professor Schlegel’s conclusion, we judge from Temmiuck’s plate 
that the bird figured is really the young of N. poliogaster, since it agrees with this 
species in its stout form, and presents conspicuous points of difference both in form and 
coloration from the young of A. pileatus. 
