60 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 4TH SER. 
In the second edition of the B. O. U. List, Puffinus yel- 
kouan (Acerbi) is treated as a subspecies of Puffinus puffinus, 
and is therefore included in the above synonymy. ‘The varia- 
tions distinguishing the two phases appear to be dichromatic 
as well as geographic. 
So close is the resemblance of the light phase of P. opis- 
thomelas to “P. yelkouan” that I am unable to define fully 
their distinctive characters without a more adequate series of 
“P. yelkouan” for comparison. 
MEASUREMENTS (in millimeters) 
5 Middle 
No. Locality Sex|Wing| Tail | Cul- Goer bueacsnle Tar- |Toe and 
men | Depth | Width | sus | Claw 
23418! | Bigbury Bay, Devon- 
shire Ene. ay. of 8.5 | 14 |45 | 50 
234201 | South Wales........ oH 8.3 | 14 {43.3} 49.2 
234211| Old Head of Kinsale, 
co. Cork, Ireland ..| ¢ 8 14.5 |43.7| 48 
234191 | Bigbury Bay, Devon- 
shire, Eng........ ce) 8.4 | 12.5 45 | 50 
113660 2 | New Brunswick, Can.) 9 8 12 44.1} 51 
74307 2 | Bosporus........... of 8.2 | 12.8 |45 | 49.5 
115493 2 | S. Antioco, Sardinia. .| 07 8.7 | 13.1 [44.3] 51.2 
TNS AOD 2UINICE are e eel ciee 9 TES WAS 2 
44 | 49 
Puffinus opisthomelas Cowes: BLACK-VENTED SHEARWATER 
Puffinus auricularis C. H. Townsend: TowNSEND’S SHEAR- 
WATER 
Puffinus gavia (J. R. Forster) : FORSTER’S SHEARWATER 
Covurs—4#strelata gavia, IV, 154, 171. 
Satvin—Pufiinus gavia, 369, 381. 
GopMan-—Puffinus gavia, xlti, 120, pl. 32. 
It is maintained by Mr. Gregory M. Mathews that the 
words “supra coerulescenti-nigra’ in the original description 
of Procellaria gavia J. R. Forster* prove that the description 
does not relate to the shearwater we are considering, but to 
the small bluish-backed one frequenting New Zealand seas, 
1 Carnegie Mus. 
2U.S. Nat. Mus. 
3 Rectrices worn. 
4 Descr. Anim., p. 148. 
