44 Canon Tristram on the 



plumage. In this stage the bird seems to be the Tatare 

 fuscus of Lesson (Rev. Zool. 1842^ p. 210). 



3. ACROCEPHALUS SYRINX (Kittl.). 



This species is decidedly the most normal of all the Oceanic 

 forms in its coloration, but with the long bill characteristic 

 of the group. Its home is very far away from that of the 

 two previous species, being confined, so far as we know, to 

 the eastern islands of the Caroline archipelago. It was first 

 discovered at Ponape, and has since been found at Nawodo, 

 or Pleasant Island, by Dr. Pinsch, as also in Huk, and in the 

 Mortlock group, in the islets of Lugunor and Uleei. Here, 

 where there are no reeds, Kubary found it breeding gregari- 

 ously in the Pandanus trees. In Ponape it breeds exactly 

 like the Reed-Warblers, in reeds over water. 



4. AcROCEPHALUs piSTOR, sp. uov. (Plate II.) 



o . Sv-pra pulverulento-cinereus, gula et pectore albis ; late- 

 ribus aiblc^is : remigibus fuscis, marginibus arctissime 

 albidis ; secunciariis in externo pogonio albo marginatis : 

 rectricibis brunneis albo terminatis, rectricis externae in- 

 terno pogonio albo arete marginato ; alarum tectricibus 

 inferioribus albis ; rostro corneo, tarsis et pedibus fusco- 

 nigris. Long. tot. 7"15, alse 3"25, caudse 3*2, rostri a 

 rictu 1"0, tarsi I'l. 

 $ mari similis, sed gula et alarum tectricibus inferioribus 

 cinereo-albis. Long. tot. 7*0, alee 3"05, caudee 2'9. 

 Hab. Fanning Island, Pacific. 



This very striking species is in size very close to A. syrinx, 

 but differs markedly from it in coloration, in the size and 

 colour of the beak, and in the colour of the feet and tarsi. 



In its slaty-grey colour and peculiarly marked appearance 

 it differs from all its congeners; but this marking, which 

 gives it the dusty powdered appearance exactly like a baker^s 

 coat, and from which I have named it pistor, is caused by a 

 whitish fringe round each of the slate-grey feathers, exactly 

 as the marking of the backs o^A. aquaticus and A.phragmitis 

 is caused. The white edges of the remiges and upper wing- 

 coverts are also very conspicuous. 



By its dark horn- coloured beak, which is at the same time 



/■ 



