PETREL. 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 

 molluscae, 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 PEL AGIO A, Mihi. 

 PLATE CIII. FIG. 2. 



Procellaria pelagica, Linn. Syst. 1. 212. 1 Gmel Syst. 1. 561 Briss. Orn. 



6. 140. pi. 13. f. 1 Lath. Ind. Orn. 2. 826. sp. 19. Shaw's Zool. 13. 



220 F/m. Br. Anim. 1. 135. No. 218. 

 Oiseau de Tempete, Buff. Ois. 9. 327. 

 Petrel Tempete, Temm. Man. d'Orn. 2. 810. 

 Kleinster Sturmvogel, Meyer, Tasschenb. Deut. 2. 495. 

 Storm-finch, Will. (Angl.) 395. 

 Stormy Petrel, Penn. Br. Zool. 2. 553. No. 259. pi. 91 Arct. Zool. 2. 



464.- Edward's Glean, pi. 90 Atom's Birds, 3. pL 92 Lath. Syn. Sup. 



269 Lewin's Br. Birds, 6. pi. 219 Mvnt. Orn. Diet, and Sup Bewick's 



Br. Birds, ed. 1826, p. t. 246. 



PROViNCiALLittle Petrel, Witch, Mother Carey's Chicken, Mitty, 

 Assilag, Spency, Sea-swallow, AUamouty. 



