12 



BIRDS OF THE HAWAIIAN GROUP. 



(graduated for about 2.40), culmen 1.22, tarsus 1.40, middle toe with claw 1.78. Hah, 

 Middle Pacific from Hawaiian Islands to Galapagos (Ridgway). (No specimen in 

 Museum.) 



13. !£,. phseopyg'ia Salv. Dark-rumped Petrel. 

 aa. Smaller and paler above; upper tail coverts ashy-grey, much less abruptly 

 white beneath the surface (bill stouter); larger; under wing coverts mostly dark; feathers 

 of the back distindlly edged with grey ; under parts white, except along the sides of 

 fore breast. Female similar. Yoioig: Smaller, with the under tail coverts as long as or 

 longer than the tail feathers ; upper back and tail coverts much more broadly edged 

 with blue-grey ; whole aspect of the back lighter ; less blue-grey on the sides of fore breast. 

 Length 1 1. 15-14.00 (12.75 ), wing 7. 40-8.60, tail 3.20-4.70, culmen 1.02-1. 10, tarsus i.io- 

 1.15, middle toe i. 40-1. 50, inner toe 1.15-1.20. Hah. North Pacific Ocean. Laysan, etc. 

 The following talkie will show the variation in measurements of young fledged birds 



and adults : — 



Juvenile (June rt^ ). 



Male. 

 II .50 



Adult ( September ). 



Length • . • • 



Wing 



Taif 



Culmen • . • 

 Tarsus ■ . . • 

 Middle toe. 

 Inner toe ■ • 



7-50 

 3-70 

 1.08 

 1 .15 

 1.50 

 1 .20 



Fenialc. 



I I. 15 

 7.40 

 3.20 

 I .02 



1-15 

 1.40 



I -'5 



PI. XIX., 7907, 7908. 



14- ^ 



Male, 



I 2.50 



8.60 



4-45 

 1. 10 



1.40 



1-15 



I-'emale. 



i4.oo(?) 



«-75 

 4.70 

 I .10 

 I.. 15 

 1.50 



I-I5 



hypoleu'ca .Salv. Bonin Petrel 



Ge.n-us BULWE'RIA B().\apakte. 



Plumage entirely dusky sooty brown, darker on the upper parts (smaller); 

 under tail coverts falling short of the end of the tail by more than .50; the greater 

 lu/ng eoc'erts lighter hroivii 011 their edges, forming a quite well defined patch ; quills 

 nearly black. Doiviiy young: uniform dark sooty brown. Length about 10.00, wing 

 7.75, tail 4.50, ctilnien .90, tarstis 1.20. Hah. North Pacific Ocean. Laysan, Kauai, 

 French Frigates, Hawaii (Mills). 



PI. XIX., 8768. 15. B. bul'weri (JAKD. & Set-bv). Bulwer's Petrel. 



Genus PRIO'FINUS Hombr. & jAcy. 



Tail long, cuneate; under surjace oj hody zvhite; feathers of the head and upper 

 plumage not edged with white ; back, greater wing coverts and primaries entirely deep 

 soot}- brown with slat}' brown beneath ; feathers of the back edged with paler brown; 

 sides of the neck greyish, mottled ; under tail coverts dusky ; auxiliaries dusky. 

 Length (J 17.50 $19.00, wing 11. 25-12.00, tail 6.00, culmen i. 50-1. 55, tarsus 1.75, 

 middle toe 2.15-2.25. Hah. North Pacific Ocean. Laysan, Kauai, etc. 



PI. XIX., 7928. i6. P. cunea'tus (Salvin). "Wedge-tailed Shearwater, Unu kane. 



[268] 



