Perret. NATATORES. THALASSIDROMA. 533 
form the third section of his genus Procellaria, under the 
title of ‘ Petrel Hirondelle,” which sections, as I have be- 
fore observed, are correspondent to generic divisions. They 
are birds of nocturnal or crepuscular habits, and are seldom 
seen except in lowering weather, or during storms, when they 
frequently fly in the track of ships. At other times, and 
in clear weather, they remain concealed during the day in 
the holes of rocks, rat burrows, &c. and only come forth at 
nightfall in search of food, consisting of marine insects, small 
molluscs, and other oily animal matter, which they find 
floating on the surface of the ocean. Their flight is peculiarly 
swift, equalling that of any of the Swallow tribe, which birds, 
indeed, they resemble both in size, colour, and general ap- 
pearance. The known species are all of a dark hue, more or 
less relieved with white, are widely distributed, some being 
found in both hemispheres, and in a variety of climate. 
‘They breed in the crevices of rocks, caverns, &c. and, like 
the members of the two preceding genera, lay but one egg, 
which is white, and comparatively of a large size. 
COMMON STORM-PETREL. 
THALAssiDROMA PELAGICA, Mihi. 
PLATE CIII. Fie. 2. 
Procellaria pelagica, Linn. Syst. 1. 212. 1.—Gmel. Syst. 1. 561.—Briss. Orn. 
6. 140. pl. 13. £ 1.—ZLath. Ind. Orn. 2. 826. sp. 19.—Shaw’s Zool. 13. 
220—Filem. Br. Anim. 1. 135. No. 218. 
Oiseau de Tempéte, Buff: Ois. 9. 327. 
Pétrel Tempéte, Temm. Man. d’Orn. 2. 810. 
Kleinster Sturmvogel, Meyer, Tasschenb. Deut. 2. 495. 
Storm-finch, Wil/. (Angl.) 395. 
Stormy Petrel, Penn. Br. Zool. 2. 553. No. 259. pl. 91.—Arct. Zool. 2. 
464.—Edward’s Glean. pl. 90.—Albin’s Birds, 3. pl. 92.—Lath. Syn. Sup. 
269.—Lewin’s Br. Birds, 6. pl. 219.—Mont. Orn. Dict. and Sup.—Bewick’s 
Br. Birds, ed. 1826, p. t. 246. 
Provincrat-—Little Petrel, Witch, Mother Carey’s Chicken, Mitty, 
Assilag, Spency, Sea-swallow, Allamouty. 
