DIRECTORY TO BIRDS OF EASTERN NORTH AMERICA. 25 



c. Diabolic Petrels. Aestrelata. 

 Oceanic Petrels, mainly inhabiting the warmer waters of 

 (he world, those occurring with us being only stragglers. 

 Size, moderate, 15.00 or less; bill, short, nasal tubes about 

 one-third its length ; wings, long, folding beyond tail ; tail, 

 wedge-shaped; colors, black, often with conspicuous white 

 markings. Nests, placed in cavities of rocks, sometimes on 

 mountain tops of islands. 



1. BLACK-CAPPED PETREL. A. hasitata, 16.00; 

 top of head and upper parts, black , scapularies, and mar- 

 gins of feathers, and back, paler ; rump, basal half of tail, 

 sides of tail, sides of head and neck, and lower parts, pure 

 white. Occurs in the warmer parts of the Atlantic ; strag- 

 glers have been taken in Fla., Vir., N. Y., Vt., and Ont. 



2. SCALED PETREL, A. scalaris. Size of 1 ; dark 

 bluish-ash above, feathers of back, scapularies, and greater 

 wing coverts, broadly bordered with ashy-white ; beneath, 

 white, irregularly and rather finely banded on sides and be- 

 low with grayish. Known only from a single specimen which 

 was obtained in a plowed tield in Livingston Co., N. Y. in 

 April, 1880. 



d. Wedge-tailed Petrels. Bulweria. 

 Bill and general form much as in c, but the tail is more 

 decidedly graduated or wedge-shaped. 



1, BULWER'S PETREL, B. bulweri. 10.00; sooty- 

 brown throughout, paler beneath and on greater wing-cov- 

 erts. Occurs off the coast of Europe and Africa ; occasional 

 in Greenland and accidental in Bermuda. 



e. Storm Petrels. Procellaria. 

 Smallest of our Petrals, about .5.50 long; bill, short, na- 

 sal tubes, about half its length; tail, nearly square; tarsus 

 short, about the length of the toes; bill and feet, wholly 

 black. 



1. STORMY PETREL, P. pelagica. Sooty-black 

 throughout, lighter below; upper tail coverts and patch of 



