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

 even, or at most only very slightly rounded. 

 e 1 . 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 2 . Secondaries 10. (Subfamily OceanitincB.') 



b 1 . 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, with 



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



and flanks white striped with dusky Pealea? 



(?. 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.) 



6 s . Tarsus exceeding middle toe by more than the length of the cuhnen ; 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 culnien, the anterior scutellse 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. 



* Pealea Ridgw., Auk, Hi., July, 1886, 334. Type, Thalaasidroma lineata Peale. 



