66 NOR?FH AMERICAN BIRDS. 
Top of head, and upper parts generally, except upper tail-coverts, 
uniform dusky, the back and scapulars paler, with perceptibly 
still paler terminal margins to the feathers; upper tail-coverts, 
basal half (approximately) of tail, head and neck, except top 
of the former (and sometimes the hind-neck also), together with 
lower parts, including axillars and under wing-coverts, pure 
white; the sides of the chest sometimes with a brownish gray 
wash; length 14.00-16.00, wing 11.40-11.75, tail 4.80-5.30 
(graduated for 1.25-2.00), culmen 1.22-1.38, tarsus 1.40-1.45, 
middle toe, with claw, 1.98-2.10. Hab. Middle Atlantic, strag- 
gling to coasts of North America (Florida and Long Island) 
and Europe.... 98. A&. hasitata (KuHL). Black-capped Petrel. 
b*. Plumage of lower parts chiefly or entirely dusky. 
c. Upper tail-coverts pale smoke-gray or grayish white, in marked 
contrast. 
Entirely (except upper tail-coverts) uniform sooty brownish, 
rather paler and grayer below; wing 10.80-11.00, tail 4.95-5.00 
(graduated for 1.18-1.20), tarsus 1.38-1.40, middle toe, with 
claw, 1.95-2.00. Hab. Jamaica and adjacent portions of Carib- 
bean Sea. 
4S, jamaicensis (BancrorT). Jamaican Petrel.! 
c. Upper tail-coverts dusky, like rest of plumage. 
d@. Wing more than 9.50. 
é, Plumage sooty black above. 
Lower parts very dark sooty slate, the feathers white 
beneath the surface; wing 10.75-12.00, tail 4.50-5.60 
(graduated for about 1.20), culmen 1.35, tarsus 1.55- 
1.60, middle toe, with claw, 2.20-2.40. Hab. Southern 
Atlantic, and Antarctic Ocean in vicinity of Kerguelen 
Island. 
4£. atlantica (GouLD). Atlantic Petrel? 
e*, Plumage slaty or dark sooty grayish or plumbeous above. 
J. Larger (wing more than 11.00); wing 11.20, tail 4.55, 
culmen 1.10, tarsus 1.25, middle toe, with claw, 1.80. 
Hab. South Atlantic (vicinity of Trinidad Island). 
. trinitatis Grat. & Satvap. Trinidad Petrel. 
Ff’. Smaller (wing less than 11.00); wing 9.68-10.20, tail 4.17- 
4.35, culmen 1.05-1.08, tarsus 1.35-1.46, middle toe, 
with claw, 1.69-1.78. Hab. Southern oceans. 
£. brevirostris (Lzss.). Short-billed Petrel.t 
1 Procellaria jamaicensis Bancnort, Zool. Jour. v. 1828, 81. fstrelata jamaicensis A. & E, Newton, 
Handb. Jam. 1881, 117, 
2 Procellaria atlantica GouLp, Ann. Mag. N. H. xiii, 1844, 362. 
8 Hotrelata trinitatis Satvap. & Gie., Ibis, 1869, 65. Sanvin, Rowley’s Orn. Misc. pt. iv. 1876, 253 
pl. 32. 
4 Procellaria brevirostrie Lxss,, Traité, 1831, 611. Cstrelata brevirostris Sauvin, Rowley’s Orn. Mise. pt. 
