THE BIRDS OF SINGAPOSE ISLAND 
Allied Species 
Three other oJive- brown bnlbuls in size more or less the 
same as P. plumosus are not uncommon in Singapore but they 
are essentially country birds and do not normaily approach the 
town. 
They all differ from P. flumosus in lacking the green wash 
on the wings. These three species are Moore's olive bulbnl 
{Pycnonotus simplex) with white irides, Blyth's otive bulbul 
(P. bruviieus) with orange or reddish irides and a slif^htly 
smaller species with a smaller and blacker bill and also with 
red irides which may be known as the small olive bulbul (P. 
crythropt ha Im os). 
We have obtained all these birds on Bnkit Timah on the 
same day. P, (ryihroptholniQS seems to be the least commori 
of the three. 
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