175 [Vol. xliii. 



Wings little developed, apparently incapable o£ sus- 

 taining flight ; primaries soft-vaned, weak ; hamuli present, 

 but apparentl}-- not functioning ; first primary shortest ; 

 secondaries still less developed ; coverts very long, nearly 

 as long as secondaries. 



Rectrices — central, as long as middle toe with claw ; all 

 rectrices weak and loose vaned ; rami discontinuous. Oil- 

 gland tufted. 



Coloration. Ralline. 



Type, Atlantisia rogersi. 



Distribution. Inaccessible Island, S. Atlantic. 



Atlantisia rogersi, sp. no v. ^~.. 



Adult. Whole of upperside nearly uniform dark amber- 

 brown ; forehead, vertex, lores, and sides of face dark slaty- 

 black ; occipital and nuchal region washed with umber-brown 

 and gradually merging into umber-brown of upper parts ; 

 flanks dark slaty-black, nearly black, faintly' barred with • 

 whitish ; chin, fore neck, pectoral region grey ; abdomen 

 grey, feathers fringed with buffi ; under tail-coverts black, 

 fringed with buff. 



Wings : remiges blackish-greyj faintly washed on outer 

 border with buflish ; coverts and scapulars darker, -washed 

 with umber on edges and tips and barred with buffy-white. 



Bill, legs, and feet (in dried skin) dark horn. 



Type, adult (not sexed). No. 1923.7.8.1 in the British 

 Museum. Inacessible Island, S. Atlantic, 1923. 



Exposed culmen 18"5, tarsus 22, middle toe with claw 30, 

 wing 55, tail 30 mm. 



Named in honour of the Rev. H. M. C. Rogers, Resident 

 Chaplain on Tristan d'Acunha. 



Ohs. On the occasion of the visit of the Shackleton- 

 Rowett Expedition to the Tristan d'Acunha group, 

 Mr. Wilkins, naturalist on board the ' Quest,' was unable to 

 procure skins of the " Island Hen"" on Inacessible Island. 

 He left collecting-material with Mr. Rogers and a request 

 that he would get the islanders to procure examples when 

 opportunity offered. 



