Vor. II, Pr. II] 
LOOMIS—A REVIEW OF THE TUBINARES 
119 
The above review of specimens demonstrates the existence of 
a protracted postnuptial moult in this species. 
I can not posi- 
tively affirm from the specimens at hand whether there is, or 
is not, a limited prenuptial moult or a deferred limited post- 
juvenal one. 
In unworn plumage the white phase of Puffinus opisthomelas 
and Puffinus auricularis present, in the material before me, the 
following distinguishing characters: 
P. opisthomelas 
General aspect above dark 
brown. 
Sides of neck mottled with 
gray, more or less brownish in 
shade. 
Sides brownish gray (often dis- 
continuous), posteriorly the 
feathers narrowly tipped with 
P. auricularis 
General aspect above black. 
Sides of neck more or less 
mottled with black. 
Sides white, sometimes slightly 
dark gray posteriorly, but feathers 
not narrowly tipped with white. 
white. 
Brown predominant in the dark 
color of the lower tail-coverts. 
Black predominant in the dark 
color of the lower tail-coverts. 
Axillaries sometimes subter- 
minally dark gray, unevenly tipped 
with white. 
Axillaries subterminally dark 
brownish gray, narrowly and 
evenly tipped with white. 
Puffinus auricularis, like Puffinus opisthomelas, browns with 
the wear of the feathers. The measurements of the two species 
overlap. 
The extreme and average dimensions of sixty-two males and 
forty-one females of Pufinus opisthomelas are set forth in 
millimeters in the annexed table. As the distal primary is 
worn or not fully grown in some cases, the wing-measurements 
are only approximately accurate. 
Upper Mandible Middle 
Sex | Wing | Tail | Culmen)——————————| Tarsus |Toe and 
Depth | Width Claw 
Waimea eerane o | 254 84 | 39.5 9 1560) 25-5 |} SOok! 
Manian esse ies eae o' | 234 74 | 34.8 7.8 | 11.6 | 39.4 | 49 
Mieartin pa eoartecr rs Gr. cae o | 244 78 | 37.3 8.4 |] 14 43 52 
Miata tina eine oie Q@ | 252 83 | 38.5 8.6 | 15.5 | 45.9 | 54.5 
Manimuam. 220958 Q | 235 7M || eS! 7 11.5 | 39.4 | 48 
Mieanby in alee xcay Seen Q | 243 79 | 35.7 oll || US.4 || 23 1) Sil 2 
Taking the above tabulation as a criterion, the males have 
but little advantage over the females in size. 
