252 Journal of the F.M.S. Museums. [Vov. VIII, 
Of these the true T. aureiventer can be at once separated 
from all the others by the extremely pale flanks and belly, 
which are pale ashy buff, not clear grey; by the bright pale 
yellow of the upper surface and throat and by the very broad 
white ocular ring. 
From the material before us it is probably almost exclu- 
sively a coastal form, ranging from Tenasserim along the coast 
of the Malay Peninsula to Banka and possibly Java and the 
low country of eastern Sumatra. 
Zosterops mesozantha and Z. tahanensis are probably 
identical and differ at a glance from typical Z. auretventer by 
the dark green upper surface and by the clear French grey 
colour of the sides of the belly and flanks. The size, too, is 
somewhat larger than in Z. aureiventer. 
This race is probably a montane form and we have 
considerable numbers of it from the mountains of Siamese 
Malaya, south to the mountains of southern Selangor. 
Z. ventralis, which we have not seen, has been compared 
with authentic Z. tahanensis by Mr. Richmond, who states (1m 
lit.) “Z. ventralis and Z. tahanensis are by no means the same. 
The type of the former compared with the specimen of 
Z. tahanensis submitted, differs in the following particulars: 
it has a slightly browner shade of green on the upper parts, 
particularly on the head, and the upper tail coverts are not 
distinctly yellower; the yellow throat is less clear, the grey 
sides are slightly browner, the lower abdomen and under tail 
coverts are much less yellow and the anterior part of the 
thighs is dusky greyish, not yellow. The yellow of the throat 
merges gradually with the colour of sides of head and sides of 
neck, without the fairly distinct demarcation between the two 
colours shown in the specimen of Z. tahanensis sent. The 
white eye-ring is much less conspicuous in Z. ventralis, which 
has also a very noticeably heavier and longer bill. Other 
dimensions are nearly the same in the two specimens.” 
The Engano bird Z. salvadorui (Z. imcerta, Salvad.), differs 
from Z. aureiventer in larger size, though with a lighter bill 
and in having the yellow median band on the abdomen only 
lightly marked 
Z. buxtont from Java and Sumatra is certainly distinct in 
its bright yellow upper surface, and in its short bill and small 
size it agrees with the true Z. aureiventer, while it resembles 
Z. tahanensis in its grey flanks, but apart from dimensions 
can be at once separated from that race by the yellow upper 
tail coverts and by the yellow forehead and loral line. 
The dimensions of five specimens taken in the flesh are— 
Total length, 96-105; wing, 48-50; bill, from gape, ro. 5-12.53" 
tail, 37-39; tarsus, 14-16 mm. 
Expedition to Korinchi: 
