V 
A Specimen of Jouanin's Petrel 
from Lisianski Island, Northwestern Hawaiian Islands 
Roger B. Clapp 
At about 0330, 4 September 1967, as I walked along the northwest 
beach crest of Lisianski Island, I saw a small dark petrel sitting on 
the ground near some Bonin Petrels ( Pterodroma hypoleuca ) in an open 
sandy area bordered by clumps of tall grass ( Eragrostis varlabills ). 
Not knowing the bird's identify I captured ft by hand. 
later I tentatively Identified the bird as Jouanin's Petrel 
(Bulweria fall ax ) The specimen (USNM 54-3185) was subsequently 
examined critically by G.E.Watson, W.R.P, Bourne, and C. Jouanin, 
all of whom corroborated the identification. Bourne (pers. corr., 
10 April 1968) wrote that the bird was apparently " . . . a typical 
specimen of Bulweria fallax . . . Jouanin, who described this 
species in 1955 (L’Olseau, 25:160), wrote (pers. corr., 7 May 1968) 
" . . . il s'agit d'un examplaire typique de Bulweria fallax ." 
Measurements of the bird, a male with the left testis measuring 
5x3 mm., were taken from the frozen carcass prior to its prepar¬ 
ation as a study skin. These were: culmen, 28,3 ram., wing (chord), 
243 mo. J tail, 120 mm., and tarsus, 30 ram. These measurements 
compare quite favorably with the measurements of a male collected 
by Bailey (ibis, 1966.; 108:239) (28.5-238-113-31) and with the 
measurements of the male type (Jouanin, op.cit.)(28-232-124-32) 
\ - 
except for thte measurement of the wing of the latter which is not 
comparable since the flight feathers were in molt. 
{ 
j 
l 
