^STRELATA. 65 



with claw, 1.83-1.90. Hah. South At- 

 lantic (island of Trinidad). 



2E,. arminjoniana Gigl. & Salvad. Ar- 

 minjon's Petrel,* 

 h^. Tail 4.60, or less ; culmen 1.10, or less. 



Similar in color to u^. 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. Hah. South Pacific 

 (Hondon and Christmas Islands), 

 2E,. parvirostris (Peale). Small-billed Petrel.^ 

 /'. Axillars and under wing-coverts 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 white, 

 the sides and longer lower tail-coverts sometimes 

 irregularl}^ 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. Hah. 

 Middle Pacific, from Sandwich Islands to the 

 Galaf)agos. 



JE.. phaeopygia Salv. Dark-rumped Petrel.' 

 d\ Wing less than 9.00, 



Plumage much as in jE. pha;opygia, but back, scapulars, and 

 upper tail-coverts decidedly plumbeous, the latter not white 

 beneath surface ; wing 8.40-8.60, tail 3.80-4.00 (graduated 

 for about 1.40), culmen .95-.98, tarsus .95-1.00, middle toe, 

 with claw, 1.30-1.32. Hah. Southern oceans generally, 



^. leucoptera (Gould). White-winged Petrel,* 

 c^. Upper tail-coverts plain white, in marked contrast with color of back. 



1 JEatrelata arminjoniana GiGL, & Salvad., Ibis, 1869, 62. Salvin, Rowley's Orn. Misc. pt, iv, 1876, 252, 

 pi, 31, 



2 Procellaria parvirostris Peale, ZooI, U, S, Expl. 1848, 298, atl. pi. 40, JEstrelata parvirostris Coues 

 Pr. Ac. Nat. Sci, Phil, 1866, 146, 



^ (Estrelata phscopygia Salvin, Trans. Zool, Soc. Lond. ix. pt. ix, 1875, 507, pi, 88, fig. 1. (Galapagos.) 

 ? (Estrelata eandwicJiensis RiDGW., Water B. N. Am, ii, 1884, 396, in text. (Sandwich Islands.) 



* Procellaria leucoptera Gould, P. Z, S. 1844, 57 ; B. Austr, pi, 51. (= ^Estrelata cookii CoUES et AuCT, , 

 but, having compared specimens, I am able to say that Procellaria leucoptera Gould and P. cookii Gray are 

 not only specifically distinct but belong to entirely different genera, the latter being the type of Cookilaria 

 BoNAP,, distinguished from Estrelata, among other characters, by its lengthened, slender. Shearwater-like bill, 

 as noted on page 55.) 



9 



