ZESTRELATA. 65 
with claw, 1.83-1.90. Had. South At- 
lantic (island of Trinidad). 
48. arminjoniana GiaL. & Satvap. Ar- 
minjon’s Petrel.! 
HW, Tail 4.60, or less; culmen 1.10, or less. 
Siniilan in ‘olen to 4. arminjoniana, but 
much darker above, the color inclining to 
uniform sooty black throughout, the fore- 
head and chest more brownish; wing 
10.50-11.10, tail 4.40-4.60, culmen 1.08- 
1.10, tarsus 1.28-1.35, middle toe, with 
claw, 1.70-1.78. Hab. South Pacific 
(Hondon and Christmas Islands). 
4&. parvirostris (PEALE). Small-billed Petrel.? 
J*. Axillars and under wing-coverts mostly white. 
Upper parts, including hind-neck and upper tail- 
coverts, uniform brownish slate, darker on wings 
and tail and nearly black on head, the feathers of 
hind-neck and the upper tail-coverts (the latter 
very abruptly) white beneath the surface; fore- 
head, lores, cheeks, and entire lower parts shite; 
(3) the sides and longer lower tail-coverts sometimes 
irregularly barred with dusky; wing 11.80-12.00, 
tail 5.50-5.75 (graduated for about 2.40), culmen 
1.22, tarsus 1.40, middle toe, with claw, 1.78. Hab. 
Middle Pacific, from Sandwich Islands to the 
Galapagos. 
48. pheopygia Sav. Dark-rumped Petrel.3 
?. Wing less than 9.00. 
Plumage much as in 4. pheopygia, but back, scapulars, and 
upper tail-coverts decidedly plumbeous, the latter not white 
beneath surface; wing 8.35-8.60, tail 3.80-4.00 (gradu- 
ated for about 1.10-1.40), culmen .95—.98, tarsus .95~—1.05, 
middie toe, with claw, 1.30-1.32. Hab. Southern oceans 
generally. 
. brevipes (PEALE). Short-footed Petrel.4 
c. Upper tail-coverts plain white, in marked contrast with color of back. 
1 Hetrelata arminjoniana Gieu. & SAuvan., Ibis, 1869, 62. Savin, Rowley’s Orn. Misc. pt. iv. 1876, 252, 
pl. 31. F . 
2 Procellaria parvirostrie Peay, Zool. U. 8. Expl. 1848, 298, atl. pl. 40. Zstrelata parvirostris Couns, 
Pr. Ac. Nat. Sci. Phil. 1866, 146. 
3 CEstrelata pheopygia Sauvin, Trans. Zool. Soc. Lond. ix. pt. ix. 1875, 507, pl. 88, fig. 1. (Galapagos.) 
? Getrelata sandwichensis Ripaw., Water B. N. Am. ii. 1884, 395, in text. (Sandwich Islands.) 
4 Procellaria brevipes Prauz, Zool. U.S. Expl. Exp. Birds, 1848, 294.—strelata brevipes Sresn., Proc. 
U.S. Nat. Mus. xvi. 1893, 619. (Synonymes are: Procellaria torquata MaceiLuiv.—Procellaria cookii Cass., 
nec GRAY, nee GouLD.—Procellaria desolata SCHLEGEL, part, nec GMEL.) 
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