367 
of the United States . 
ces, for which, more than for protection, they follow vessels 
under way, playing in their wake, where they pick up the 
animals put in motion, and the floating weeds. Breed soci- 
ally in holes and cavities of rocks overhanging the sea : lay 
one or two eggs. Feed their young by regurgitation. Rest 
easily on the water, suspending their light bodies on the top 
of the waves with extended wings, riding on them, touching 
with their feet. Flight rapid, irregular, always low and 
skimming the water in day time. Voice chattering : silent 
during the day ; clamorous at night. 
Spread in all latitudes and longitudes. A small and ex- 
ceedingly natural genus, formed of but five well, ascertained 
species, so closely allied to each other, as to be generally 
confounded. Resembling the Swallows. 
Differs from Procellaria, as Lestris from Larus. 
308. Thalassidroma wilsonh, Nob. Deep sooty black ; upper 
tail coverts wholly white ; tail even, the wings reaching a lit- 
tle beyond its tip ; tube of the nostrils recurved ; tarsus one 
inch and a half long ; a yellow spot on the webs. 
Stormy Petrel , Procellaria pelagica, Wils. Am, Orn . vii, 
p. 90 .pL 60. Procellaria wilsonii , JVoh, J . Ac. Ph. vi. p. 231, 
pi. 9. lower figure. 
Inhabits throughout the tropical and temperate Atlantic 
Ocean, not extending far to the north ; more common on the 
coasts of the southern states and on the banks : found also 
on the coasts of Africa, and even those of Spain, thus entitled 
to a place in European Ornithology. 
309. Thalassidroma leachii, Nob. Brownish-black ; upper 
tail-coverts white, with dusky shafts ; tail forked, the wings 
not reaching beyond the tip ; tube of the nostrils straight ; 
tarsus one inch long. 
Procellaria Leachii , Temm. Nob. J. Ac. Ph. vi. p. 229. 
pi. 9, upper figure. Fork-tail Petrel ? Procellaria furcata 9 
Lath . (27.) 
