(syn. Pterodroma Ϯ Black-capped Petrel P. hasitata) Gr. οιστρηλατος oistrēlatos driven by the gadfly < οιστρος oistros gadfly, horsefly; ελαυνω elaunō to drive; "11. Aestrelata, Bp. 34. diabolica, L'Herm. (l'herminieri, Less.) 35? sericea, Less. 36. hasitata, Temm. 37. flavirostris, Gould. 38. desolata, Lath. (fasciata, Bonn. ?alba, Gm. variegata, Bonn.) ?gularis, Peale. ?brevipes, Peale. 39? inexpectata, Forts. [sic]" (Bonaparte 1856); "177. Aestrelata, Bp. (Daption, p. Steph. - Thalassoica, p. Reich.) Rostrum brevissimum, compressum, robustissimum, a tubo nasali statim uncinatum: pedes breves, digitis brevissimis: alae longae: cauda eleongata, gradata. 1. PROCELLARIS HAESITATA, Temm. an Kuhl? nec Forst." (Bonaparte 1857). “ŒSTRELATA ... This genus, which was wrongly spelled Æstrelata by Bonaparte, was proposed by him ... for the Capped Petrel, Procellaria hasitata Kuhl. On the same page of the same journal, but a few lines previously, Bonaparte introduced Pterodroma for Procellaria macroptera of Smith. These two birds are undoubtedly congeneric, and it has recently been argued that Pterodroma, which has generally been ignored, should stand. The mistake has probably arisen because these names have generally been quoted as first described in the ‘Conspectus Genera Avium,’ vol. ii., and in that work Æstrelata comes first on p. 188, Pterodroma on p. 191. The sheet containing these descriptions is dated 1856, but there is internal evidence to show that it could not have been issued till a subsequent year. The names, therefore, must first have been introduced in the Comptes Rendus for 1856” (BOU 1915). Var. Oestrelata, Estrelata.