AVES PUFFINID/E. 159 



Wings : General color plumbeous blue. The ends of the longer scapu- 

 lars are black or dusky, with white tips; the smaller wing-coverts, the 

 outer vanes on the first four primaries, the terminal portion of the tertials, 

 black or plumbeous black. The inner vanes of the quills and the tips of 

 the tertials pearly or greyish white. 



Tail : Colored like the back. The tips of the central rectrices are 

 broadly dusky or black ; the lateral rectrices are gray with black shafts 

 and with faint dusky tips. 



Lower parts white, shaded on the sides of the breast and flanks with 

 pearly grey. The under tail coverts mottled with a deeper shade of 

 plumbeous blue. 



Bill blue black. 



Tarsi and toes light blue. 



Eyes dark brown. 



In shape the bill is very wide, with the edges of the maxilla distinctly 

 convex. The complete development of the serrated lamellce, makes them 

 distinctly visible when the mouth is closed. 



Geographical Range. Southern Oceans; between 40 to 60 south 

 latitude. 



The Princeton Expeditions did not secure the Broad-billed Petrel, and 

 the -description here given is based on the large series of this bird in the 

 Collections of the British Museum of Natural History. 



This species of Prion has been long known to breed on the west coast 

 of Tierra del Fuego, at Landfall Island (Darwin, Voy. Beagle, Birds, p. 

 141, 1841), and has also been taken at a number of different points off 

 the coast of Patagonia. 



"I did not procure a specimen of this bird, although I saw numbers on 

 both sides of the Continent from about lat. 35 S. to Cape Horn. It is a 

 wild solitary bird, appears always to be on the wing : flight extremely 

 rapid. Mr. Stokes (Assistant Surveyor of the Beagle) informs me that 

 they build in great numbers on Landfall Island, on the west coast of 

 Tierra del Fuego. Their burrows are about a yard deep : they are ex- 

 cavated on the hill-sides, at a distance even of half a mile from the sea 

 shore. If a person stamps on the ground over their nests, many fly out 



