68 NORTH AMERICAN. BIRDS. 
mottled and vermiculated with ash-gray and white, but 
the former prevailing; lower breast, belly, sides, and 
flanks smoky plumbeous superficially, but the feathers all 
pure white immediately beneath the surface; wing 10.15, 
tail 4 (graduated for .90), culmen 1.00, tarsus 1.25, middle 
toe, with claw, 1.70. Hab. North Pacific, in vicinity of 
Alaska (Kadiak). 
100. AE. fisheri Ripew. Fisher’s Petrel. 
c, Back plumbeous or plumbeous-black, the feathers bordered with gray- 
ish, or whitish, producing a scaled appearance. 
d', Above plumbeous-black, the feathers of back and scapulars mar- 
gined with gray; hind-neck white, with tips of the feathers 
pale gray; forehead and lower parts white; wing 11.50, tail 
5.00, tarsus 1.40, middle toe, with claw, 1.90. Hab. Hastern 
South Pacific (island of Masafuera)\ 
ZE. externa Satv. Salvin’s Petrel. 
d?. Above, including whole top of head, dark bluish gray, the feathers 
of back and scapulars broadly bordered terminally with ashy 
white, the middle and greater wing-coverts similarly marked ; 
chin, throat, chest, centre of breast, and under tail-coverts plain 
white; rest of lower parts vermiculated and irregularly barred 
with slate-gray or plumbeous, this becoming uniform and some- 
what darker on belly; tail chiefly plain light brownish gray; 
wing 9.88, tail 3.95, culmen 1.03, depth of bill at base .46, tarsus 
1.37, middle toe, with claw, 1.70. Hab. Unknown; the single 
specimen obtained having been taken in Livingston Co., New 
York, in April, 1880. 
99. AZ. scalaris Brewsr. Scaled Petrel.’ 
6%. Wing not more than 9.00. 
Above ash-gray or plumbeous, changing to white on forehead and 
over eyes; outer surface of wings uniform; lower parts entirely 
white, except sides of breast, which are ash-gray, like hind-neck; 
outermost rectrices entirely white; wing 8.70-9.00, tail 3.80-4.00 
(graduated for about .90-1.00), culmen 1.04—1.12, tarsus 1.07-1.20, 
middle toe, with cluw, 1.40. Hab. Eastern South Pacific. 
®. defilippiana GieL. & Satvap, De Filippi’s Petrel.? 
1 G@strelata externa SAuv., Ibis, July, 1875, 373. 
2 (= “MH, gularis” of the A. 0. U. Check List, but not Procellaria gularis PEALE.) strelata sealaris 
Brewst., Auk, iii. July, 1886, 390. 
3 Aistrelata defilippiana Gieu. & SALVAD., Ibis, 1869, 63. 
