Vou, II, Pr. IT] LOOMIS—A REVIEW OF THE TUBINARES 145 
Mr. Gregory M. Mathews remarks that the “all dark birds 
from San Benedicto Island are separable from any other form 
of P. pactficus [=chlororhynchus| by their more powerful 
bills.”* Not one of the San Benedicto birds at hand has a bill 
as large as that of a male from the Kermadec Islands, which 
has the chord of the exposed culmen 44.1 mm., the depth of the 
upper mandible 12.2 mm., and the width 18 mm. 
The Expedition collection contained fifty-five specimens. 
When outward-bound in 1905, fifteen were taken at sea on 
July 25, twenty-one from burrows on San Benedicto Island on 
July 26, two at sea on August 8, and three on Clipperton Island 
on August 10; when homeward-bound in 1906, fourteen were 
secured at sea between the 4th and 12th of October. 
The specimens captured at sea on July 25 are in worn 
plumage with renewal commencing on the pileum, cervix, 
jugulum, and breast, and in some instances on the abdomen. 
Specimens taken from burrows on the following day are also 
in worn dress, but as a whole are more backward in their 
moulting. The August specimens are in about the same con- 
dition as the July ones. Those of October show advance both 
in wear and restoration; the primaries and rectrices, however, 
are still unaffected by the moult. 
Inasmuch as specitnens taken from burrows are often worn 
and faded, it becomes apparent that breeding stations can not 
be relied upon implicitly to furnish typical examples of geo- 
graphic, or other, variations in color. 
Seventeen males and thirty females of the Expedition afford 
the following measurements in millimeters : 
Upper Mandible Middle 
Sex | Wing] Tail | Culmen|——_, | Tarsus |Toe and 
Depth | Width Claw 
Maximum........... o | 309 | 148 | 41.2 | 11.5 | 17.2 | 48.2 | 62 
Minimum. 245s 550. o | 289 | 129 | 36.6 9.5 | 13.9 | 41.4 | 52.2 
WiGanveses eee cite c | ee |) PO NW TI Sa NOS Sl) A 1) S755 
Maximum see eee ey |) Silk |) We at ae |p a w@ 1) akg |) Oil 
Mig serra Q | 287 | 128 | 36.6 9.2 | 14.5 | 43.8 | 53 
Js [Cave a Ay AD ue ate Q 298 | 138 | 38.9 | 10.3 | 15 46 57.2 
Length and extent in flesh: One male, 444 mm., 978 mm. ; 
one female, 430 mm., 980 mm. 
1 Birds Austr., v. 2, p. 84. 
