14 BIRDS OF THE HAW- All AN GROUP. 



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



partly feathered ; bill thick through the base (Page 14.) Sul'idae. 



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'idae. 



Family PHAETHONTID^.— Tropic Birds. 



Charadlers the same as for the family (Page 14.) Pha ethoil. 



Genus PHA'ETHON Lixn.«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 ivch of p/i/imrirs -a'liitc 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. Fciualc similar. / 'ciy voting 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. Hah. Central Pacific and Indian Ocean. Laysan, etc. 



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



aa. Oii/o' pr/iiian'(\s icitlt the outer zcch lilack 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. rubi-i- 

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

 coverts; innermost secondaries and scapulars with a very 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. 



(rlUUS. 



Characters the same as for the family ■ (Page 14.) Sula. 



Gexus STJI/A Pjkissox. 



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



urved; n'/io/c of Ura'c/- Jazc togctlwr n'itli the throat and chin naked. YoiDig: Upper 



parts unicolor. ( Sub-genus Sula.) 



[270 



c 



