53 [A^ol. XXXV. 



terised by Laving the outstretched feet extending consider- 

 ably beyond the tail and by having the outer pairs of 

 tail-feathers pure white [vide Bull. B. O. C. xiii. 1903^ 

 p. 36]. Poliolais helenora, the type of the genus^ has 

 remained till the present time the only species assigned 

 to it. 



Whilst engaged at the British Museum in working out 

 Mr. Boyd Alexander's fine collection from Cameroon Moun- 

 tain, I have discovered another species of Poliolais, which I 

 exhibit and propose to name in honour of the collector : — 



Poliolais alexanderi^ sp. n. 



Adult male. Crown dark grey, fading into olive on the 

 mantle ; rest of the upper-parts dark olive-green, paler on 

 the rump ; wings dark brown, outer margins of secondaries 

 tipped with olive ; under wing-coverts white, yellowish 

 towards^ the bend of the wing. Two central pairs of tail- 

 feathers dark brown, the second pair having the shaft white, 

 outer tail-feathers white. Sides of the head, chin, and throat 

 slate-grey, fading into olive on the sides of the neck ; rest 

 of under-parts pale olive-green, becoming ashy towards the 

 middle of the breast and belly and faintly washed with 

 rufous on the flanks ; thighs rufous-brown ; under tail- 

 coverts buff. Bill black, legs and feet dark. 



Culmeu (exposed) 13 mm. ; wing 55 ; tail 35 ; tarsus 23. 



Hab. Cameroon. 



Type in the British Museum : J" ad. (No. 1). Cameroon 

 Mt., 6. V. 09. Boyd Alexander coll. 



When Boyd Alexander described the adult male and 

 female of Poliolais helenorce in the ' Bulletin of the British 

 Ornithologists^ Club/ xiii. 1903, p. 36, he had not seen any 

 immature examples of this species. Two years after the 

 discovery of the type Mr. E. Seimund secured three more 

 examples from the same island — an adult female and two 

 immature birds (male and female). As the young have 

 never before been obtained, and as they differ very 

 materially from the adult, I append the following 

 description : — 



