298 PatMER, A Petrel New to North America. cae 
feathers almost entirely brown; all zrregularly tipped with the dark body 
color, and alZ having brown shafts. Rectrices entirely brown, paler at 
base, and sometimes having (except central pair) the base white for a short 
distance. Outer toes slightly shorter than the middle. Toe nails long 
and narrowish. 
Oceanodroma cryptoleucura. KNUDSEN’S PETREL. 
Similar to O. leucorhoa in size, color and marking, but with sligh¢ly 
forking tail. Upper tail-coverts pure white, the longer feathers droadly 
and somewhat evenly tipped with the dark body color; all having the 
shafts whzte. Rectrices (except central pair) whzte at base for fully an 
inch and extending further along outer webs of thé outer pair. Outer 
toes dec¢dedly shorter than the middle. Toe-nails shorter and broader. 
Measurements, from Ridgways Manual. 
Wing. Tail. Forking. ‘Tarsi. 
O. leucorhoa 6.00-6:30 3.50-4.00 .80-.90 .90-.95 
O. cryptoleucura 5-90-6.30  3.00-3.15  .20-.30 .85-.90 
Measurements of the Washington Specimens. 
Bane O Wo 12s (Colle 6.20 2.94 oD .gO 
3234 2 as 6.00 2.85 at .gO 
Length of No. 3234, 7.75; extent, 19.10. 
The greater amount of white at the base of the tail-feathers, 
the broad dark tips of the upper tail-coverts, and the slightly 
forked tail will readily serve to identify this species. The 
Hawaiian Islands, Galapagos and Washington birds agree well in 
these characters. 
Both my specimens are molting and seem to be adults and are 
both females. In both the bulk of the feathers have been changed 
except on the neck and throat. The wings in both have been 
entirely renewed, the outer pair of feathers in each showing 
remains of the sheaths at their bases. In one, No. 3234, the tail 
has been entirely renewed, no remains of the sheaths showing; 
while in the other but nine feathers are full grown, the next to 
the outer pairs being rather more than two thirds their full length, 
and the fourth on the right side is nearly half grown. Some of 
the upper tail-coverts lack their full growth on both. 
The capture of one of these specimens came about in a rather 
peculiar way for a Petrel. The first was received from a boy who 
