346 



THE TUBE-NOSED SWIMMERS — TUBINARES. 



A« Cuhnen very concave ; feathers at base of maxilla cxteiKling in an anj^le nearly or quite to 

 the hase of the nasal tube, that on the mamlible forming a still more <leciiled angle. 

 (fUnmedea.') 

 1. D. exulans. Wing, 26.50-29.(Xl inches. yl(/i(Z< : White, the remiges blackish. Youwj : 

 Dusky, with fore part of head whitish (older individuals with more wliite). 



/>. albalrus, adult. 



B* Culnien slightly concave, the bill more compressed ; feathering at base of maxilla exteniliiig 

 obliquely in a nearly straight line iJir back of the na.sal tube, that of the mandible aku 

 nearly straight. 

 «. Latericorn narrower at base than in middle portion. (Phcpbaxtritt.) 



2. D. albatruB. Wing, 22.00-23.00 inches ; culmen, r)..')0-.'».(iO ; depth of bill at base, l.!).">- 

 2.05; tarsus, 3.8(M.(K) ; middle toe, 4.(55-4.1)0. Adult: White, the pileum and nape 

 bright straw-yellow ; tail, remiges, etc., slaty brown, tlie shafts of the ijuilLs bright stiaw- 

 yellow ; bill grayish white, more yellowish on the unguis, and i)urple brownish on tlir 

 mandible; legs and feet grayish dusky. Youtuj: Uniform sooty, the pileum and iia]ii' 

 blackish ; shafts of primaries bright straw-yellow ; bill pale horn-yellow ; legs and I'd t 

 grayish brown. Hub. Olf the Pacitic coiLst of North Amei'ica (e.^pecially of Alaska). 



3 D. nigripes. Wing, 18.50-20.50 inches ; culmen, 4.00-4.25 ; deptli of bill at base, 1.1')- 

 l.CO ; tai-sus, 3.50-3.70 ; middle toe, 4.05-4.40. Uniform dusky (more grayi.sh belnw), 

 the crissuni, u[)per tail-coverts, and base of the tail white in the adult ; anterior iwrtimi 

 of the head whitish ; bill dusky purplish brown ; legs and feet l)lack. /lab. Pacific luast 

 of North America. 

 b. Latericorn nmch broader at base than in midtUe portion. {Thdlamirche.) 



4. D. melanophrya. Wing, 19.50-20.00 inches ; tail, 8.»K)-H.50 ; culmen, 4.3(M.70 ; tarsii.s 

 3.(K)-3.25 ; nii(hlle toe, 4.(Kl-4.30. Adult : Head, neck, rump, upjjer tiiil-covert.-!, ami 

 entire lower parts white, the side of the head with a nnm- or less distinct grayish stri|u', 

 darkest immediately before and behind the eye ; back and scapulars browrish slate, nmre 

 ashy anteriorly ; wings uniform dark brownish slate ; tail brownish g'ay, the sliatts nf 

 the feathers yellowish white. Itiil yellowish, the ungui and l>ase of '.ulmcn sometiincs 

 (in younger individuids I) tinged or clouded with grayish ; legs and feet "pearly slati." 

 Hub. Southern oceans ; casual (1) olf coast of California. 



