1 



14 BIRDS OF THE HAWAIIAN GROUP. 



bb. Middle tail feathers not greatly prodiiced; no external nostrils; head 



partly feathered; bill thick through the base (Page 14.) Sulidse. 



aa. Tail deeply forked; webs between the toes'deeply emarginate; tarsus very 

 short, not longer than the hind toe and claw; wing and tail exceedingly long. 



(Page 15.) Fregat'idse. 



Family PHABTHONTID^.— Tropic Birds. 



Genus. 

 Chara<5lers the same as for the family (Page 14.) Phaethon. 



Genus PHA'BTHON Lixx^us. 



Plumage very close and satiny ; general color white, usually tinged with pink 

 or salmon color, with some black on the upper parts. 



a. Outer li'cb of priiuarjcs icliitc to the base ; elongated tail feathers carmine with 

 black shafts ; a black comma-shaped patch on the side of the head, starting at the cor- 

 ner of the mouth and prolonged backward behind the eye ; inner secondaries with a black 

 band down the middle;, flank feathers with a greyish black shaft stripe; feet black; at 

 the base of toes yellow ; bill red. Female similar. ] 'cry young have the whole back, head 

 and wings white barred with black. Length 30.00-36.00, culmen 3.50-3.70, depth of 

 bill .85-1.05, wing 12.50-13.00, tail without middle feathers 5.00, with middle feathers 

 16.50-20.00, tarsus 1.15-1.20. Hub. Central Pacific and Indian Ocean. Laysan, etc. 

 PI. XX., 8554, 9715. 20. P. rubricaud'a Bodd. Red-tailed Tropic Bird. 



aa. Oute)- primaries n'itli the outer -wet) black for the greater portion of its 

 length; elongated tail feathers white or apricot color; black on outer web of first pri- 

 mary falling short of the tip by an inch or more ; basal two-thirds of both mandibles 

 more or less blackish horn color; black on the side of the head much as in P. rubri- 

 cauda; a black band along the wing formed by the black tips of the median wing 

 coverts; innermost secondaries and scapulars with a ver}' broad oblique black band; 

 shaft of long tail-feather black above, white below. Length 23.00-28.00, wing 10.50- 

 11.00, culmen 2.00, depth of bill .70, tarsus .75, middle toe 1.40, tail without plume 

 4.50, tail with long feathers 16.50-18.00. Hab. Inter-tropical seas. Hawaiian Islands. 

 PI. XX., 9895, 9896, 7599. 21. P. leptu'rus Lacep. & Daux. White-tailed Tropic Bird. 



Family SUI^ID^.— Gannets. 

 Geuus. 

 CharaAers the same as for the famih' (Page 14.) Sula. 



Genus STJI/A Brissox. 



Bill sub-cylindrical and tapering to a point, the extremity of which is slightly 

 curved; ivliolc of loivcr jaio together ivitli the throat and chin naked. Young: Upper 



parts unicolor. (Sub-genus Sula.) 



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