PROCELLARIID.E — PUFFININ^: SHEARWATERS, ETC. 1033 



Analysis of Species. 



Tail long, cuneate. (Subgenus Thtellodroma. ) 



Two-colored ; white below, dark above cuneatus 



Tail shorter and more rounded. (Puffinus proper.) 

 Two-colored ; white below, dark above. 



Large : length IG.OO or more ; wing 12.00 or more. 



Pale brownish-ash; under tail-coverts white, upper largely dark. Atlantic .... borealis or kuhli 



Dark brown ; under tail-coverts dark, upper largely white. Atlantic gravis 



Dark brown ; under and upper tail-coverts dark ; feet flesh-color. Pacific crealopus 



Medium ; length under IG.OO, over 13.00 ; wing 9.25. Above blackish. Atlantic puffinus 



Small ; length 13.00 or less ; wing 9.00 or less, but over 7.00. 



Under tail-coverts mostly white. Atlantic auduboni 



Under tail-coverts black. Pacific opislhomelas and auriciilaris 



Smallest; wing 7.00 or less ; under tail-coverts white. Straggler to Nova Scotia assimilis 



One-colored ; sooiy. 



Large ; length IG.OO or more ; wing 11.00 or more. 



Under wing-coverts mostly dark. Atla:itic fuliginosus 



Under wing-coverts mostly whitish. Pacific ijrisens 



Kmall : length about 14.00 ; wing 10.00. Pacific tenuirostris 



(* Bicolor species, white below.) 



(Subgenus Thyellodroma.) 

 P. (T.) cunea'tus. (Lat. cuneatus, wedged, as the tail is; cunetis, a wedge.) Knudsen's 

 Wedge-tailed Shearwater. Two-colored; white below, dark above. Feathers of upper 

 parts not edged with white ; back and wings sooty, former, including rump and upper tail- 

 coverts, sometimes mixed with more grayish or ashy feathers. Primaries and tail-feathers 

 blackisli. Top and sides of head and neck grayish-brown, edged with lighter on forehead, 

 lores, and thence backward below eyes. White of under parts shaded with ashy or dingy, es- 

 pecially along sides ; under tail-coverts mi.xed lighter and darker brown; under wing-coverts 

 white with touches of gray on some feathers, and a brownish border. Bill horn-colored or 

 bluish; feet flesh-colored. A dark phase lacks white of under parts. Length about 17.00; 

 wing 11.75; tail 5.50, with lateral rectrices only 3.60, thus graduated nearly or about 2.00; 

 bill 2.25; tarsus 1.90; middle toe 2.33, outer 2.20, inner 1.90. A strongly marked species (in 

 comi)arison with any of tlie following). N. Pacific, from Sandwich Islands to Japan and 

 Mexico; breeds on San Benodicto Island of the Kcvillagigedo Group; Lower California (Cape 

 San Lucas, Anthony); Gulf of California (Tres Marias Isls., Nelson). Not in former editions 

 of the Key. Salvin, Ibis, 5th ser. vi. July, 1888, p. 353 ; Cat. B. Brit. Mus. xxv, 1896, p. 371 ; 

 Anthony, Auk, 1898, pp. 38, 313; Nelson, N. Am. Fauna, No. 14, April 29, 1899, ]>. 27. 

 P. knudseni Stej. Pr. U. S. Nat. Mus. xi, Nov. 8, 1888, p. 93. 



(Subgenus Pitfinus.) 



P. kuh'li. (To Dr. Ileinrich Kuhl, an early monographer of Petrels, who died Sept. 14, 

 1821, aged 25.) Cinereous Sheauwater. Mediterranean Shearwater. Bill scarcely 

 or not shorter than liead, equal to tarsus, moderately hooked, with short nasal tubes, about \ 

 as long as culmen, but rather high for this genus, with trace of a median ridge; nostrils ojM'n- 

 ing roundish. Wings folding a little beyond tail, which is graduated, with lengthened middle 

 feathers. Feet rather weak ; outer toe and claw longer than middle toe and claw ; tip of inner 

 claw about reaching base of middle. Adult : Upjier ])arts light smoky-gray, or pale brownish- 

 ash, uniform on crown and nape, interrui)ted on back by wliite or grayish-white edges of the 

 featliers, es])ecially on .^icapulars, darkening on wing-coverts and inner secondaries to grayish- 

 brown ; rump like back ; upper tail-coverts successively acquiring white till the longest ones 

 arc mostly of this color, only touched with brown. Primaries grayish-black, with large white 

 spaces on basal half or two-thirds of inner webs ; <iuter webs and tips of most secondaries grayish- 

 {Juinbeous ; most of their inner webs white. Entire under parts, from chin to ends of under tail- 



