Order PROOELLARIIFORMES. Family PROCELLARIIDM. 
No. 111. 
COOKILARIA (COOKII) AXILLARIS. 
CHATHAM ISLAND PETREL. 
(Plate 81.) 
GEstrelata axillaris Salvin, Bull. Brit. Orn. Club, Vol. I., p. xxxm., March 1st, 1893, Chatham 
Islands (Ibis, 1893, p. 264). 
Buller, Trans. New Zeal. Inst., 1894, Vol. XXVII., p. 123, May, 1895. 
Buller, New Zealand Birds, Suppl., Vol. I., p. 119, 1905. 
Salvin, Cat. Birds Brit. Mus., Vol. XXV., p. 418, pi. vn., 1896 (pref. Dec. 16th, 1895). 
Godman, Monogr. Petrels, pt. i\\, p. 252, pi. 72, April, 1909. 
P terodroma coohii axillaris Mathews, Birds Austr., Vol. II., pt. n., p. 168, July 1st, 1912 ; Murphy, 
Amer. Mus. Novit., No. 370, p. 3, Sept. 6th, 1929. 
Oookilaria coohii axillaris Mathews and Iredale, Ibis, 1913, April, p. 233 ; Mathews Syst. Av. 
Austral., p. 123, 1927 (June 13th). 
Pterodroma axillaris Oliver, New Zealand Birds, p. 147, Aug., 1930. 
Distribution. Chatham Island. 
Adult male. General colour above grey, darkest on the head ; fore-head and lores as far as the eyes 
mottled grey and white, more noticeable immediately over the bill; head dark grey ; mantle, 
back, and upper tail-coverts dark grey, a little lighter than the head ; rump like the head; 
tail feathers uniform dark grey, not blackish at the tip ; primaries blackish, the inner webs 
of the outer quill with a white wedge from the base, narrowing for about three-quarters of 
the way to the tip, this white area extending on the remaining feathers ; wing-coverts 
dark blackish-grey ; the area behind and below the eye like the head ; sides of neck with grey 
vermiculations ; chin and entire under-surface white, including the sides of the body, vent and 
under tail-coverts ; under aspect of quills white, like the middle-coverts ; outer edge and 
tip of primaries dark blackish-grey ; a line running round the bend of the wing, top-coverts, 
axillaries and secondary-coverts blackish with a white tip to most of the feathers. Eyes 
black, bill black, tarsus and upper part of the foot pinkish, remainder black, including the 
whole length of the outer toe. Total length 310 mm.: culmen 24, wing 216, tail 99, tarsus 32. 
Figured. Collected on Chatham Island, New Zealand. 
The sexes are alike. 
Again quoting Murphy for sub-specific characters : Of smaller size than typical 
coohii , except in length of tail, and with a notably shorter bill; white of fore-head 
more restricted, dark feathers being thickly interspersed medially from the base 
of the bill, and through the loral regions ; inner vdng and a vdde external border, 
in ventral aspect, as v r ell as axillaries blackish ; dark rump-patch nearly 
obsolete. 
The dorsal surface in this race is not paler than its typical coohii . 
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