Vou. 11, Pt. 11] LOOMIS—A REVIEW OF THE TUBINARES 139 
gray, and white, more or less tinged with gray, prevails at the 
base of the feathers of the jugulum and breast. The two ex- 
tremes are linked together by intermediates. While the sig- 
nificance of this dual coloration has not been fully determined, 
the collateral evidence, which is of the same character as that 
presented in the Sooty Shearwater, is in favor of dichromatism 
—not of age or geographic variation. We must look to future 
investigations on nesting grounds for a final settlement of the 
case. 
Judging from the original description, the type of Puffinus 
intermedius Hull* is apparently intermediate between the light 
and dark phases of P. tenutrostris; its bill is too short for P. 
griseus. 
The dark gray of the lower parts varies somewhat in iitise 
ent specimens, and is often of a distinctly brownish shade, be- 
coming still browner by wearing. In some specimens the 
feathers of the breast and abdomen are conspicuously tipped 
with pale gray. No. 9731 C. A. S. has numerous obscure 
brownish and brownish white bars on the throat and brownish 
ones on the sides of the head posterior to the eyes, and No. 
9743 C. A. S. has fourteen fully developed rectrices. 
Of the Academy’s series of fifty-five specimens from the 
ocean off Point Pinos, California, three were taken in October, 
twelve in November, thirty-four in December, and six in Janu- 
ary. The general condition of the plumage in this series is 
similar to that obtaining in the Sooty Shearwater during the 
same months of the year. Several specimens are belated in 
moult; two (Dec. 2, 9) have the distal primaries still in the 
sheath, and one of them, also three rectrices. Two other speci- 
mens (Dec. 2, Jan. 2) are growing single rectrices and two 
others (Dec. 2, Jan. 2) are renewing feathers on the hind neck 
and back. A couple of Alaskan specimens from the Carnegie 
Museum, taken June 25, are well along in a complete moult. 
The relationship is very close between Puffinus tenuirostris 
and Puffinus griseus. As manifested in the accompanying 
tables, the maximum measurements of the former species over- 
lap the minimum ones of the latter, except in the length of the 
culmen. The total length, taken from skins, also shows an 
overlapping, which, however, may disappear in measurements 
Pa eee ema ane rica tn ny mes 
