21 



Sylochelidon stbenuus. Syl. fronte vertice et nuchd nitide nigris ; 

 dorso alis cauddgue pallide cinereo-griseis ; religuis plumis albis. 



Forehead, crown and nape deep glossy black ; back, -vvings and tail 

 pale ashy grey, becoming lighter on the tail and deepening into dark 

 grey on the primaries, the shafts of which are white ; remainder of 

 the plumage pure white; irides black; bill scarlet, stained with 

 yellow on the sides and tip, and with greenish yellow near the ex- 

 tremity. 



Totai length, 20^ inches ; bill, 4 ; wing, 16^^ ; tail, 6| ; tarsi, 2. 



Hab. Southern coasts of Australia. 



Remark. — The above is the description of the plumage of the 

 breeding season ; at other times the head instead of being wholly 

 black is mottied with black and white. 



Sula personata, Sul. alba ; tectricibus alarum majoribus, secun- 

 darits, tertialibus, rectricibus lateralibus, et rectricum intermedi- 

 arum apicibus, intense fuscis. 



The whole of the plumage pure white, vvith the exception of the 

 greater wing-coverts, primaries, secondaries, tertiaries, the tips of 

 the two centrai and the whole of the lateral tail-feathers, which are 

 of a rich chocolate-brown ; irides yellow ; naked skin of the face and 

 chin in dead specimen duU bluish black ; legs greenish blue. 



Totai length, 29 inches; bill, 5; wing, 16į; tail, 8^; tarsi, 2|, 



Hab. North and north-east coasts of Australia. 



Remark. — A very robust and powerful species. 



