206 Mr. E. C. Stuart li-.ker on [Ibis, 



Indian and soutliern Burmese birds. The latter have, as a 

 general rule, the black nuchal patch decidedly larger and 

 extending well on to the interscapulars. In general tint 

 also they are darker and duller, the backs a deeper olive 

 with a more pronounced tint of bronze, and the crests and 

 rumps a distinctly deeper, more crimson red. 



As regards measurement, the following are the dimensions 

 of birds in the British Museum, together with a few others 

 which I have been able to examine : — 



Travancore "Wing 131-142 mm. Average 136'6. 13 specs. 



Burma above lat. 20". . ,, 141-165 mm. „ 154-0. 8 „ 



„ 19°.. „ 139-151 mm. „ 1450. 26 „ 



„ „ „ 1H°.. „ 142-157 mm. „ 147-2. 12 „ 



„ „ „ 17°.. „ 139-155 mm. ,, 144*5. 12 ,, 



„ „ „ 16°.. „ 136-151 mm. „ 1430. 44 „ 



„ „ „ 14°.. „ 137-150 mm. „ 142-5. 29 „ 



„ „ „ 12°.. „ 132-144 mm. „ 1405. 15 „ 



„ „ „ 10°.. „ 136-152 mm. „ 144-0. 12 „ 



Malay, soulh of lat. 10° „ 122-136 mm. „ 129-5. 31 „ 



Sumatra „ 118-139 mm. „ 128-3. 8 „ 



Java „ 124-138 mm. „ 130-3. 23 „ 



Borneo „ 118-130 nun. „ 123-9. 31 „ 



On the above material it is not very easy to define what 

 subspecies should be made. The bird from Borneo is very 

 different from all others in colour, and needs no consideration. 

 Birds from Java, Sumatra, and below lat. 10° in the Malay 

 Peninsula show a big drop in size when compared with those 

 from farther north, and Kloss seems to be well advised in 

 fixing latitude 10° as a division between two of the races, 

 but the difficulty lies in separating the northern and central 

 Burmese forms, and it seems to me that it is therefore 

 perhaps not desirable to attempt any such division. In 

 coloration there is no difference between them, and though 

 there is a fairly steady average decrease in size as one works 

 south from lat. 20° to lat. 12°, yet we find the birds between 

 lat. 10° and 12° averaging more than those between 17° and 

 18°, and we obtain individuals from Malwoon, lat. 10°-3, with 

 a wing of 152 mm., against some individuals from northern 

 Arrakan, of 143 mm. 



