56 NORTH AMERICAN BIRDS. 



<?. Wing less than 7.00. 



d 1 . Tarsus decidedly longer than middle toe, with claw; tail much 

 rounded, or slightly graduated ; plumage wholly dusky. 



Halocyptena. (Page 69.) 

 d?. Tarsus not longer than middle toe, with claw ; tail emarginate, 



even, or at most only very slightly rounded. 

 e l . Tail even, or very slightly rounded ; tarsus twice as long as 

 the culmen ; color uniform dusky, with white upper tail- 

 coverts Procellaria. (Page 69.) 



e*. Tail emarginate or slightly forked ; tarsus less than twice as 

 long as the culmen ; color variable. 



Oceanodroma. (Page 70.) 

 a*. Secondaries 10. (Subfamily Oceanitince.') 



b l . Tarsus exceeding middle toe, with claw, by less than the length of the bill 

 (measured from forehead) ; basal division of middle toe shorter than 

 rest of toe, including nail. 

 c 1 . Culmen (from frontal feathers) less than half as long as middle toe, wi'th 



claw. 



d 1 . Front of tarsus distinctly scutellate ; distance from tip of tail to 

 end of longest upper coverts shorter than middle toe ; first quill 

 shorter than third ; lower parts white, forward to the chest ; 



no white on upper parts Garrodia. 1 



d*. Front of tarsus not scutellate ; distance from tip of bill to end of 

 longest upper coverts much greater than length of middle toe 

 with claw ; lower parts dusky, or striped with dusky ; upper 

 tail-coverts white. 



e 1 . Claws narrow, pointed ; first quill much shorter than third ; 



belly and flanks uniform dusky... Oceanites. (Page 71.) 



e 2 . Claws broad, flat, blunt; first quill longer than third; belly 



and flanks white striped with dusky Pealea? 



c 2 . Culmen (from frontal feathers) more than half as long as middle toe, 

 with claw ; tarsus 2 \ times as long as culmen, appreciably scutel- 

 late in front ; nails broad, flat, and blunt ; first quill much shorter 



than third Pelagodroma. (Page 72.) 



b*. Tarsus exceeding middle toe by more than the length of the culmen ; basal 

 division of middle toe longer than rest of toe, including nail ; culmen 

 (from frontal feathers) more than half as long as middle toe, with claw ; 

 tarsus 2J times as long as culmen, the anterior scutell sometimes ap- 

 preciable, sometimes obsolete ; nails excessively broad (nearly as broad 

 as long), flat, triangular ; first quill decidedly shorter than third. 



Cymodroma. (Page 71.) 



1 Garrodia FORBES, P. Z. S. 1881, 736. Type, Procellaria nereis GOULD. 



2 Pealea RIDGW., Auk, Hi., July, 1886, 334. Type, Thalassidroma lineata PEALE. 



