PETRELS AND ALLIED SPECIES. 427 



Tail cuneate ; plumage deep sooty-black, tinged with brown 

 beneath ; length ten inches. 



2. Thalassidrofna Lcachii. LeacWs Storm - Petrel. 

 Tail forked ; plumage greyish-black tinged wdtli brown ; 

 feathers of the rump, sides of abdomen, and outer lower tail- 

 coverts white ; length nearly eight inches. 



3. Thalassidroma Wilsonii. Wilson's Storm- Petrel. 

 Tail even ; plumage greyish-black tinged with brown above, 

 sooty-brown beneath ; rump, sides of abdomen, and outer 

 lower tail-coverts white ; length seven inches and a half. 



4. Thalassidroma 2:)clagica. Common Storm - Petrel. 

 Tail slightly rounded ; plumage greyish-black above, sooty- 

 brown beneath ; feathers of the rump, and sides of abdomen 

 white ; length nearly six inches. 



