330 PROCELLARIIDZ, PETRELS.—GEN. 308, 309-10. 
308. Genus FREGETTA Bonaparte. 
White-bellied Petrel. Blackish-gray of variable intensity, blackening on 
the quills and tail, the whole under parts from the breast, the upper tail 
coverts, most of the under wing coverts, and bases of all the tail feathers 
except the middle pair, white; bill and feet black. Length about 8; wing 
6-63; tail 3, about even, with very broad, square-tipped feathers; bill 3; 
tarsus 14; longest toe (outer) and claw 1 or less; tibix bare 1 or more. 
Florida, accidental, one instance (LAwr. Ann. Lyc. N. Y.v,117). Procel- 
laria grallaria Vinitu. Procellaria fregetta Kuni, and many authors. 
Thalassidroma leucogastra Goutp. SF regetta lawrencit Bonar.; Lawr., in 
Bp., 832 (unquestionably this species). . . . . . . . GRALLARIA. 
309-10. Genus PUFFINUS Brisson. 
* Nasal tubes vertically truncate, with thin septum. (Priofinus.) 
Black-tailed Shearwater. Upper parts cinereous, nearly uniform, but 
some of the feathers with paler edges; under parts white, without line of 
demarcation from the color of the upper parts ; tail, crissum and vent blackish ; 
lining of wings, axillars, and some feathers on the sides of the body, 
brownish-cinereous ; quills blackish-cinereous on outer webs and tips, paler 
internally and basally, with brown shafts; bill yellow, the nasal case, culmen 
as far as the hook, cutting edge and groove of lower mandible, black ; feet 
(dried) dingy greenish with yellow webs. Large; 19; wing 13; tail 5-53, 
wedge-shaped, 12-feathered, the outer feathers an inch or more shorter than 
the middle; bill 14, 3 high at base, the nasal tubes nearly 4; tarsus 22; 
middle toe and claw 2g. Accidental off the coast of California. A peculiar 
species, very different from any of the following, approaching the fulmars. 
Proc. cinereus Gm.? Proc. melanura Bonn. Proc. hesitata Forsr., Descr. 
Anim. 1844, 208; Goutp, B. Aust. pl. 67; Pufinus hesitatus Lawr., Ann. 
Lyc. N. Y. vi, 5. Proc. adamastor ScnteceL. -Adamastor typus Bonar. 
Puffinus cinereus Lawr. in Bp., 835; Adamastor cinereus Cours, Proc. 
Phila. Acad. 1864, 119; Priofinus cinereus Cours, Proc. Essex Inst. v, 303. 
Puffinus kuhlii Cass., Proc. Phila. Acad. 1862, 327 (err.). . MELANURUS. 
** Nasal tubes obliquely truncate, with thick septum. (Puffinus.) 
+ Below, white or nearly so, the upper parts different. 
Cinereous Shearwater. Above, pale brownish-ash, interrupted by paler 
or white edges of the feathers, most of the upper tail coverts white ; below, 
entirely pure white, except some slight gray touches on the flanks; on the 
sides of the head and neck the ash and white gradually mingling; lining of 
wings and axillars white; quills dark with large white spaces on the inner 
webs; bill and feet mostly yellowish. Younger birds are darker, the bill 
and feet obscured. Length about 18; wing 15; tail 54, outer feathers nearly 
an inch shorter; bill 1g, 3 high at base, nasal tube only about } its length ; 
tarsus 13; middle toe and claw 24. A common bird of the North Atlantic, 
not hitherto introduced into our fauna. Proc. kuAlii Born, Isis, 1835, 
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