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 PUFFINUS OBSCURUS— LATHAM. 



DUSKY SHEARWATER. 



Puffinus obscurus, Bonap. 



Dusky Petrel, Nuttall. 



Dusky Petrel, Puffinus obscurus, Audubon. 



Specific Character — Bill slender, light blue, the tip black, from 

 the frontlet feathers to the point one inch and three-sixteenths ; 

 length of tarsi one inch and a half; sides of the head beneath the 

 eye, sides of the neck and the lower parts white ; upper parts 

 black; wings reaching to the end of the tail, which is rounded. 

 Length twelve inches, wing seven and seven-eighths. 



This is another of those stragglers that occasionally visit the coast 

 of Long Island. In plumage it is closely allied to the preceding, 

 from which it materially differs in size, being about three inches 

 less. It is said to inhabit throughout the temperate and warm seas 

 — never to the North. Abundant during summer in the Gulf of 

 Mexico, and off the coast eastward to Georgia. — Audubon. 



GENUS THALASS1DROMA — VIGORS. 



PETREL. 

 [Bill shorter than the head — slender, compressed, at the end hooked — 

 nostrils contained in a single tube — head small, rounded above — neck short — 

 body slender — wings long — tail emarginate, of twelve feathers — feet slender, 

 webbed.] 



THALASSIDROMA WILSONII— BONAP. 



WILSON'S PETREL. 

 Stormy Petrel, Procellaria pelagasia, Wilson. 

 Wilson's Stormy Petrel, Nuttall. 

 Wilson's Petrel, Thalassidroma Wilsonii, Audubon. 



Specific Character — Bill black, from the frontlet feathers to the 

 point, seven sixteenths of an inch, length of tarsi, one inch and three- 

 sixteenths. Adult male with the feet black ; a large portion of the 

 webs yellow ; plumage dark grayish-brown, darker on the back ; 

 wings and tail feathers brownish-black; rump, sides of the abdo- 

 men and outer lower tail-coverts, white— secondaries tipped with the 

 same ; tail even. Length six inches and three-fourths, wing five 

 inches and seven-eighths. 



