PROCELLARIN^. DIOMEDEA. 
333 
Lestris Richardsonii, Richardson’s Jager, Swains, Sf Rich. F. Bor. Amer. v, ii, 
p. 433. 
Richardson’s Jager, Nutt. Man. v. ii. p. 318. 
Richardson’s Jager, Lestris Richardsonii, Aud. Orn. Biog. v, v, p. 503. 
456. 3. Lestris parasiticus, Linn. Arctic Jager. 
Plate CCLXVII. 
Bill greyish-black, tinged with blue above ; feet black, but with the 
greater part of the tarsus yellow ; tail-feathers of moderate length, ex- 
cept the two middle, which are extremely elongated and attenuated, 
extending eight inches or more beyond the next, the rest broad and 
rounded ; neck and lower parts white, the former tinged with yellow ; 
upper and fore part of head, with the space before the cheeks, blackish- 
brown ; lower part of hind neck, and all the upper parts, blackish- 
grey ; primary quills and tail-feathers brownish-black, the shafts of 
the former white. Female similar to the male, but with the middle 
tail-feathers about three inches shorter. 
Male, 23, 45. 
Ranges, during winter, along and off the coast, though always in 
sight of land, as far as the Gulf of Mexico. Breeds in high latitudes. 
Lestris BufFonii, Bonap. Syn. p. 364. > 
Lestris parasitica, Arctic Jager, Swains. & Rich. F. Bor. Amer. v. ii. p. 430, 
Arctic Jager, Nutt. Man. v. ii. p. 317. 
Arctic Jager, Lestris parasiticus, Aud, Om, Biog. v. iii. p. 470. 
GENUS II. DIOMEDEA, Linn. ALBATROSS. 
Bill rather longer than the head, nearly straight, stout, 
much compressed ; upper mandible, with its dorsal line, 
much declinate, and nearly straight for a third of its length, 
then concave ascending to the unguis, on which it is arched 
and decurved in the third of a circle, the ridge broad, con- 
vex, rounded at the base, separated in its whole length by a 
groove, margined below, beyond the nostrils by a prominent 
hne, from the sides, which are erect and slightly convex, the 
edges sharp, the unguis decurved, much compressed, with 
its sides flattened, and the tip acute ; nostrils subbasal, pro- 
minent, tabular, having a horny sheath ; lower mandible 
with the angle very narrow, reaching to the tip, and having 
at its extremity a long slender interposed horny process ; 
the outline of the crura gently ascending, and quite straight, 
