PROCELLARIA TETHYS. 



in the neighbourhood of Tower Island, and discovered a colony there, apparently breed- 

 ing, but he found no eggs {Condor, IV., p. 99). 



Adult male. Sooty-black above and below, with a very slight plumbeous 

 gloss ; wing-coverts like the back, but the greater series light brown, forming a 

 wing-patch ; lower rump and upper tail-coverts pure white, with hair-like black shaft- 

 lines ; quills and tail-feathers black ; under-surface of body a little more ashy than the 

 back, with a small patch of white on the sides of the vent, adjoining the white upper 

 tail-coverts ; under wing-coverts and axillaries like the breast, with no white on the 

 lesser series or axillaries ; bill and feet black ; iris dark brown. Total length, 6 inches ; 

 culmen, 0.5 ; wing, 5.2 ; tail, 2.3 ; tarsus, 0.85 ; middle toe and claw, 0.7. 



Adult female. Similar to the male in colour. Total length about 5.8 inches ; wing, 

 5.2 ; tail, 2.3 ; tarsus, 0.95 ; middle toe and claw, 0.7. 



The specimen figured is in the British Museum, its origin is not known, but was 

 obtained probably from Kellett and Wood's Voyage. The male described is from 

 Culpepper Island, and the female from Wenman Island ; both specimens are in the 

 British Museum, from the Webster-Harris Expedition. 



