axillaris, p. 252 



MONOGRAPH OF THE PETRELS 



b 5 . Axillaries black 



b*. Inner webs of primaries greyish 



brown, not white . . . . . . nigripennis, p. 214 



Under wing-coverts entirely black or 

 slaty-grey with a median patch of 

 white or grey. 

 c 4 . Smaller ; wing, 8.5-8.8 inches. 



c 5 . No grey frecklings on the 

 under-surface, the latter 

 entirely white.. .. .. hypoleuca, p. 212 



d 6 . Breast and sides of body freckled 



with grey . . . . brevipes (light phase), p. 209 



dK Larger; wing, 11.6-12.0 inches. 

 e 5 . Above blackish, with white 

 edgings to the feathers ; head 

 intensely black ; forehead 

 white with black spots 

 f. Above grey ; forehead hoary 

 white. 



with 



phaiopygia, p. 207 



c 6 . Underneath white, 



more or less of a grey 



collar on the fore-neck . . mollis, p. 197 



d 6 . Underneath entirely white, 

 with no grey collar on the 

 fore-neck . . . . . . fece, p. 201 



g 6 . Above blackish ; chin 

 and upper-throat white ; 

 lower-throat and fore- 

 neck black or slaty- 

 grey . . magentoe, p. 203 ; wortheni, p. 205 



h 6 . Above black ; entire throat 

 black, slightly mottled 

 with white . . rostrata, p. 190 ; parvirostris, p. 193 



b. Long under tail-coverts dusky-brown, or blackish. 

 d'. Under-surface white. 



e". Quills uniform below, with no white on the 

 inner webs of the primaries ; throat and 

 sides of neck ashy-brown, a little paler than 

 the crown . . . . . . . . . . incerta, p. 195 



XL VI 



