collected on the Red Sea. 351 



121. Sterna, sp. 



122. Sterna minuta. 



In summer on the Red Sea, in small flocks from 3-6 birds. 

 Dighes, Arab. 



123. Sterna senegalensis, Sw. 



In large flocks south of the tropic. Breeds socially on coral 

 islands in July, August, and September. Abu-baten, Arab. 



124. Sterna meridionalis, Br. 

 Near Massaua. 



125. Angus tenuirostris. 



Single individuals on the whole Red Sea. On my last voyage 

 only south of 14° N.L., from the end of September. In 

 countless numbers in the Gulf of Aden, where it breeds in the 

 height of summer on the island of Bur-da- Rebschi ; we could 

 easily catch them with our hands. Length to the end of wing 

 14" 13'" ; wing 9" 6'" ; tarsus 10'". Gullet pale-yellow ; inter- 

 digital membranes dark yellowish-carneous. 



126. Phaeton tEthereus. 



Singly or in small flocks of from three to six on the Dahalak 

 Isles, near Amphila, Ras Belul, Aden, and about Bur-da-Rebschi. 

 Manners and voice much like Sterna caspia. Appears to 

 copulate while swimming, in the month of August. 



127. Dysporus sula. (L.) 



On the whole Red Sea, alone and in flocks. — El Smet, Arab. 



128. Sula melanops, Hartl., n. sp. (Plate X. fig. 2.) 



Mas ad. : Alba, subflavescens ; remigibus, scapularibus tectrici- 

 busque alarum extimis et rectricibus nigris, omnibus ad basin 

 albidis vel pure albis ; scapis infra albis ; flexura alse alba ; 

 rostro virescenti-flavo, basi nigro ; periophthalmiis et mem- 

 brana gulari rotundato-truncata nigris; iride rubescenti- 

 flava; pedibus cserulescenti-plumbeis, membranis obscurio- 

 ribus, unguibus corneo- nigris, ad apicem albidis; digiti 

 medii margine serrato toto albo. Long. 27-28" ; rostr. a 

 rict. 4" 6'"; rostr. a fr. 3" 9'"; al. 16-16|"; caud. 8"; tars. 

 2" ; dig. med. c. ung. 3" 10'"-3" 11'". Jun. : Capite, collo et 

 corpore supra fuliginosis; fascia nuchali pallidiore parum 

 couspicua; plumis dorsi ad apicem et ad basin albidis; sub- 



