Notes on the Procellariidse. 359 



CESTRELATA HYPOLEUCA, Sp. nOV. 



Supra nigricans ; interscapulio et uropygio cinereis plumis 

 singulis pallide cinereo limbatis, vertice antico albo 

 limbato, froute, loris et corpore toto subtus pure albis, 

 subalaribus albis margiue alarum externo et plaga ad 

 basin remigum nigricanti-fuscis, remigibus omnino 

 nigris ; cauda nigra ad basin alba ; rostro uigro, pedibus 

 fiaviSj digitis dimidio distali nigro: long, tota (circ.) 13'0, 

 alse 9'Oj caudse rectr. med. 4*65, lat. 3'2, rostri a rictu 

 1"4^ tarsi I'l, dig. med. cum uugue 1*4. 

 Hab. Krusenstern Is., N. Pacific (H. J. Snow). 

 Mus. Brit. 



Obs. (JE. torquata, Macg., affiiiis, sed paulo major, cauda 

 multo longiore distinguenda. 



Mr. H. Seebohm has recently presented to the British 

 Museum a single specimen of an (Estrelata obtained by- 

 Mr. H. J. Snow of Yokohama on the Krusenstern Is., in 

 North Pacific Ocean, in the spring of 1883. 



It belongs to the section of the genus having the whole of 

 the inner web of the primaries black, and therefore is allied 

 to CE. mollis and (E. torquata. It is considerably smaller 

 than (E. mollis, which, moreover, has the under wing-coverts 

 black. (E. torquata is its nearest ally, from which it differs 

 in its rather larger size and much longer tail (that of (E. tor- 

 quata only measuring 3'8 inches, instead of 4*65). Moreover, 

 the whole under surface of the body of (E. hypoleuca is pure 

 white, without a trace of the grey which prevails to a greater 

 or less extent on the chest of (E. torquata and sometimes 

 overspreads the whole under surface except the throat. 



(Estrelata torquata is a bird that seems to have been over- 

 looked by recent writers on Procellariidse. It was described 

 by J. MacGillivray in 1860 (Zool. xviii. p. 7133) from spe- 

 cimens obtained by himself in Aneiteum, New Hebrides, in 

 1859. I have now four of these examples before me, bearing 

 MacGillivray's labels. One was acquired by Schlegel for 

 the Leyden Museum in 1861, and appears in his 'Mus. des 

 Pays-Bas, Procellariidse/ p. 13, as Procellaria desolata, Gm. ! 

 MacGillivray seems to have intended to name the species 

 '' F . aneiteumensis," under which title it appears in Gray^s 



