(syn. Fregetta Ϯ Black-bellied Storm-petrel F. tropica ) Portmanteau of genera Fregetta Bonaparte, 1855, storm-petrel, and Pterodroma Bonaparte, 1856, petrel; "In Thalassidroma tropica the inner toe and claw is from 2·5-3 mm. shorter than the middle toe and claw, and the claws are more pointed than in F.grallaria. I propose the new generic name FREGODROMA for Thalassidroma tropica Gould as indicated by the construction of the foot" (Mathews 1937). Var. Fregadroma.