PBOCELLABIID^ : PBOCELLABIINJS : SREABWATEBS. 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 ohscwrus. In the dry state, bill yellowish or reddish-brown, the 

 nasal tubes and culmen 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 culmen 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 different from P. ohsamus. (P. gavia Forst. ?) 



837. P. fuUgino'sus. (Lat. fuUgmosus, sooty. Pig. 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 stiU on the throat ; lining of wings mixed sooty 

 and whitish. Bill drying an 

 undefinable dark color, in life 



dusky bluish-horn color, the Jjfi ._ ■•" . - -i . . 



tube, ridge, and hook black- y^T ^•'"11*'* ''IW^ # 



ish; feet drying dark outside, , ^^^5PS>i''-' '->~ " '» -"''»' 



pale inside; in life the inside jfgaiX^^^'r "" i» ^S^. " "', ' ._ — ' 



of tarsus and upper side of feet ^ff^g^^SSj^Sgj^BSEiffljF^ ''*"*^ * '.t ' 



livid flesh-color, the outside of T ^"''"''"''^^^^icyS;^^ - 'V 



outer toe and under side of ^^^^^ '*"»'.^ 



feet blackish; eye blackish. '"Vi ^^' 



Length about 18.00, rather 



less than more; extent about Fio. 528. - Sooty Shearwater, nat. size. (Ad nat. del. E. 0.) 



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 which 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. afiavpos, amav/ros, dark ; a-wfia, soma, body.) Dark-bodibd 

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

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

 horn-colored at tip. Feet (dry) light yellowish flesh-color, 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, 

 Cala. 



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

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

 14.00; wing 10.00; taU 3.50, graduated 0.75; chord of culmen 1.20; depth of biU at base 

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

 Japan. 



XIII. Order PYGrOFODES: 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 



