120 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH Ser. 
Puffinus auricularis C. H. Townsend: TowNSEND’S 
SHEARWATER 
Satvin—Pufinus auricularis, 369, 380. 
GopmMaN—Puffinus auricularis, xli, 112, pl. 31; Puffinus newelli, xli, 115. 
Unlike its congener the Black-vented Shearwater, Town- 
send’s Shearwater appears to be non-migratory, remaining the 
year round in the general vicinage of its breeding grounds. 
In the passage south in 1905, the first representatives of the 
species logged by Mr. Gifford were three individuals in lati-~ 
tude 19° 37’ N. and longitude 111° 11’ W. on July 25, and the 
last were two in the vicinity of Clipperton Island on August 9. 
On the return voyage in 1906, the first one was noted in lati- 
tude 12° 19’ N. and longitude 104° 3’ W. on October 2, and 
the last in latitude 19° 53’ N. and longitude 118° 1’ W. on 
October 25. 
There are only four specimens in the Expedition collection, 
and all are from the high sea. To supplement this meager © 
series, I have borrowed the following: from the Carnegie 
Museum fourteen adults and five young in down collected on 
the Revilla Gigedo Islands; from the Bishop Museum the type 
of Pufinus newelli Henshaw from Maui Island and also a 
specimen obtained on Kauai Island; and from the U. S. 
National Museum the type of Puffinus auricularis C. H. Town- 
send. 
A study of the material enumerated shows that there are 
no constant characters differentiating the Hawaiian from the 
Revilla Gigedo birds. Both belong to one species, Puffinus 
auricularis. The lower tail-coverts are extensively white in 
three Expedition and three Revilla Gigedo examples. The 
mottling on the side of the neck is present in the Kauai speci- 
men, and in one of the Revilla Gigedo specimens it is con- 
tinued across the jugulum in a band about seven eighths of an 
inch in width. The axillaries in all except the Kauai bird ex- 
hibit indications of dark color, in two Revilla Gigedo indi- 
viduals forming conspicuous subterminal patches. Examples. 
in fresh plumage from Revilla Gigedo waters are as black as 
the two Hawaiian birds. It is largely this black coloration 
that separates Puffinus auricularis from the closely allied 
Puffinus opisthomelas. (Concerning the relationship of these: 
