lo BIRDS OF THE HAWAIIAN GROUP. 



Order TUBIN ARES.— Tube-nosed Swimmers. 



Families. 

 Nostrils opening from the anterior end of horizontal nasal tubes. 



a. Tubes widely separated by the intervening culmen; wings narrow and long; 

 birds of large dimensions ( Page lo. ) Diomedeidse. 



aa. Both nasal tubes united; no intervening culmen; birds of medium or 

 small size (Page lo.) Procellariidse. 



Family DIOMEDBID^.— Albatrosses. 



Genus. 



Sides of the lower mandible without sulcus (a longitudinal groove); tail short 



and rounded and not more than one-third the length of the wing; base of upper division 



of the bill leide and elosely joined by the lateral dir'isio// ( Page lo. ) Diomed'ea. 



Genus DIOMEDEA Lixn-^Jus. 



Culmen slightly concave; bill somewhat compressed. Lateral division of the 

 bill narrower at the base than in the middle. (Sub-genus Plurbastria, Reich.) 



a. Abdomen sooty brown (wings never more than 21.00, smaller and bill more 

 slender); dark sooty brown above; bill dark brown; under wing coverts and auxilia- 

 ries sooty brown ; sexes similar. )'onn_o-: Similar to adult, but with sides of head 

 white; upper tail coverts whitish. Length about 29.00-36.00 (33.00), wing 19.50, tail 

 5.60, bill 4.00, tarsus 3.40, toe 4.90. Hah. North Pacific Ocean. Laysan, etc. 



PL XVIII., 8742. II. D. nigripes .\mi. Black-footed Albatross. 



aa. Abdomen white (bill rather slender); upper tail coverts white; under wing 



coverts blackish brown and white mixed ; wings and back l:)lackish brown ; tail brown. 



Female similar. ^\ntng similar to adult. Length about 32.00, wing 19.00, tail 6.00, 



culmen 4.50, tarsus 3.60, toe 4.75. Ilab. Gardner, Lisianski and Laysan. 



PL XVIII., 8746. 12. D. immutab'ilis Roths. Gooney. 



Family PROCEI/LARIID^.— Petrels. 



Genera. 

 Common charafters as above (with thirteen or more secondaries); bill shorter 

 than tarsus; tail feathers 12 to 14 in number. 



a. Of medium or small size (wing less than 15.00); zving more than j.oo; cul- 

 men more than half as long as the middle toe and claw. (Sub-family Fnhnarinte.) 



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