Order TUBINAEES.] 
[Eam. PKOCELLAEIIDJi:, 
(ESTKELATA COOKII. 
(COOKES PETREL.) 
Procellaria cooMi, Gray in DiefF. Trav. ii. p. 199 (1843). 
Procellaria leucoptera, Gould, P. Z. S. 1844, p. 57. 
Procellaria irevipes, Peale, U. S. Expl. Exp., Birds, p. 294 (1848). 
Pkantistes cooJci, Bonap. C. R. xlii. p. 768 (1856). 
Rhantistes velox, Bonap. C. R. xlii. p. 768 (1856). 
Coolcilaria leucoptera, Bonap. Consp. Av. ii. p. 190 (1857). 
Coolcilaria velox, Bonap. Consp. Av. ii. p. 190 (1857). 
2Estrelafa cooMi, Coues, Proc. Phil. Acad. 1866, p. 152. 
Fnlmarus cooMi, Gray, Hand-1, of B. hi. p. 106 (1871). 
Fulmarus leucopterus. Gray, Hand-1, of B. hi. p. 106 (1871). 
Procellaria coohii, Buller, Birds of New Zealand, 1st ed. p. 307 (1873). 
Native name. — Titi. 
Ad. suprk saturate cinereus, plumis quibusdem pallidius terminatis : ala tota nigricanti-brunnea, primariis et secun- 
dariis intus albis, his fere omninb albis : rectricibus centralibus cinerascentibus, reliquis albo variis, duabus 
externis intus pure albis ; fronte alb4, cinerascenti-nigro varia : regione suboculari couspicue cinerascenti- 
nigra : facie lateral! et corpore subtbs albis, pectoris lateribus cinereo lavatis et minute variis : subalaribus 
albis, exterioribus plus minusve nigricantibus : rostro nigro : pedibus flavicanti-brunneis, palmis pallidiori- 
bus : iride nigra. 
Adult. Crown of the head, hind part and sides of the neck, the back, rump, and upper tail-coverts dark ashy 
grey, changing to slaty grey in certain lights, the tips of the feathers paler, or very narrowly margined with 
greyish white, giving a peculiarly soft effect to the plumage ; entire upper surface of the wings blackish 
brown, the primaries largely, and the secondaries entirely white on their inner webs ; the forehead white, 
each feather largely centred with greyish black, presenting a spotted appearance on the surface ; under the 
eyes a broad mark of greyish black ; sides of the face, throat, fore neck, and all the underparts pure white, 
stained and freckled on the sides of the breast with ashy grey ; under surface of wings white, largely marked 
with greyish black along the outer edges ; middle tail-feathers dark ashy grey, the lateral ones mottled or 
freckled, and the two outermost ones on each side entirely Avhite on their inner webs. Irides and bill black ; 
legs and feet pale purplish blue, with the webs a little darker and yellowish. Total length 13-5 inches ; wing, 
from flexure, 9-25 ; tail 4 ; bill, following the curvature of upper mandible 1-4, length of lower mandible 1'5 ; 
tarsus 1'2 ; middle toe and claw 1'5. 
I HAVE taken the above description from the type specimen in the British Museum, which was obtained 
off the New-Zealand coast. Up to the time of my first edition I had never met with it, although 
informed of a specimen in the collection of the Rev. R. Laishley, at Auckland. Numerous examples 
have since been received from the Hauraki Gulf and other localities, but it has not yet been recorded 
in the South Island. This Petrel seems to be generally distributed around our coasts, at any rate to the 
north of Cook’s Strait. It is diurnal in its habits, and on a fine sunny afternoon in April, while lying 
off the port of Napier, a score or more of them passed our weather-bow, displaying the contrasts of 
VOL. II. 2 p 
