MONOGRAPH OF THE PETRELS. 



paler ashy margins ; quills dusky black ; tail-feathers ashy-grey ; in front of the eye 

 a blackish shade ; " bill greenish- white, black before the tube " (H. W. Henshaw). 

 Total length, 16.0 inches ; culmen, 1.4 ; middle toe and claw, 2.6 ; wing, 12.25 ; 

 tail, 4.4 ; tarsus, 1.85. 



The Plate of F. glupischa was drawn before Dr. Stejneger's note on the colour of 

 the soft parts was published, and when these details were more or less unknown. The 

 actual colour of the bill and feet are recorded by him (Bull. U. S. Nat. Mus., 

 No. 29, p. 95, 1885) : — " Bill greenish-white with the sutures and the space between 

 the nostrils and the nail, as also the tip of the latter, blackish ; feet dirty white, with 

 a faint greenish-blue tinge ; the joints and the outside of the tarsus, as also the webs, 

 except the base, blackish ; tarsus behind, and toes below, black." Other specimens 

 described by him show that the colour of the soft parts varies considerably. 



The description is taken from a specimen of the dark phase collected by Mr. H. 

 W. Henshaw at San Diego, on December 8th, 1884. 



N.B. — Since writing the above I have received for examination, through the kind- 

 ness of the Director of the Smithsonian Institution at Washington, a specimen of the 

 light-coloured form of F. glupischa ; it bears out the characters recorded above, and 

 does not appear to differ from F. glacialis, except in the colour of the bill. The specimen 

 measures 16.5 inches ; wing, 12.3 ; culmen, 1.5 ; tarsus, 2.05 ; middle toe and 

 claw, 2.7 ; tail, 4.6. 



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