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PROCELLARIID^ : PBOCELLABIINJE : SHEARWATERS. 787 



blackish, except a few of the shortest just at the vent. More dark color on flanks, on lining 

 of wings and axillars than in obseurus. In the dry state, bill yellowish or reddish-brown, the 

 nasal tubes and eulnien blackish, the hook mostly bluish-white. Outside of tarsus for the 

 most part, outer toe and edges of webs, blackish ; rest of foot pale yellowish flesh-color; "iris 

 brown." Wing about 9.00; tail 3.75, graduated 0.60 ; tarsus 1.80 ; middle toe and claw 2.10 ; 

 chord of cuhnen 1.40; gape 2.00; end of nasal tubes to tip 1.05 ; height at base 0.42, at hook 

 0.32. Cape St. Lucas, L. Gala. Decidedly diflerent from P. obseurus. (P. gavia Porst. ?) 



837. P. fuligino'sus. {Ij&t. fuliginosus, sooty. Fig. .528.) Sooty Shearwater. Very different 

 from any of the foregoing. Nearly uniform dark sooty-brown, blackening on quills and 

 tail-feathers, more sooty-gray below, paler still on the throat; Hniug of wings mixed sooty 

 and whitish. Bill drying an 

 undefinable dark color, in life 

 dusky bluish-horn color, the 

 tube, ridge, and hook black- 

 ish ; feet drying dai'k outside, 

 pale inside ; in life the inside 

 of tarsus and upper side of feet 

 livid flesh-color, the outside of 

 outer toe and under side of 

 feet blackish ; eye blackish. 

 Length about 18.00, ratlier 

 less than more; extent about Fig. .528. - Sooty Shearwater, nat. size. (Ad nat. rtel. E. C) 



40.00; wing 12.00; tail 4.00; tarsus 2.25; middle toe and claw 2.50; chord of culmen 1.75- 

 2.00; gape 2.33 ; feathers on side of lower mandible to tip 1.67; depth of bill in front of nasal 

 tube 0.40. A wide-ranging species ; common off our Atlantic coast, especially northerly. It 

 is perfectly distinct from any of the two-colored species, of several of vidiich it has at times 

 been considered to be the 9 or a special state of plumage. Breeds in colonies, often of great 

 extent, laying a single egg in holes burrowed several feet deep in the ground. 



838. P. amauroso'ma. (Gr. ajiavpos, amauros, dark ; a-wfia, soma, body.) Dark-BODIED 

 Shearwater. Similar to the last, from which perhaps not specifically distinct. Under 

 wing-coverts white, only interrupted by some dusky marbling. Bill (dry) brownish-black, 

 horn-colored at tip. Feet (dry) light yellowish flesh-ccdor, tinged with brown on outside of 

 tarsus, outer toe, and tips of claws. Smaller: wing 11.00; tail 4.25, graduated 0.90 ; tarsus 

 2.00; middle toe and claw 2.40; outer do. 2.30; chord of culmen 1.70. Cape St. Lucas, 

 C'ala. 



839. P. tenuiros'tris. (Lat. tenuis, slight, thin ; rostrum, beak.) Slender-billed Shear- 

 water. Distinct : a small, weak-billed, short-tailed, very dark-colored species, sooty-black 

 above, quite black on quills and tail-feathers, beneath smoky-gray, palest on throat, the 

 under tail-coverts nearly as blackish as the upper parts. Groove of under side of primary- 

 shafts yellow. Bill (dry) dusky greenish-yellow, brighter along edges and at tip; feet (dry) 

 yellowish, the hinder edge of tarsus and under surface of webs bbicliish. Length about 

 14.00; wing 10.00; tail 3.50, graduated 0.75; chord of culmen 1.20; depth of bill at base 

 0.30; width 0.40; tarsus 1.90; middle or outer toe and claw 2.25. N. Pacific, Sitka to 

 Japan. 



XIII. Order PYGOPODES: Diving Birds. 



In the birds of this order the natatorial plan reaches its highest development. All the 

 species swim and dive with perfect ease; many are capable of remaining long submerged, 

 and of traversing great distances under water, progress being effected by the wings as well 



