A COLLECTION OF BIRD-SKINS FROM SIAM. 201 
month of the year, or say from April to September, from every part ot 
its range, is absolutely necessary before the various forms of ewilis can 
be worked out. In the Williamson collection sent home in 1915—now 
unfortunately broken up between different museums—there was a 
really excellent series of males from Siam, grading from the richly- 
coloured birds with golden chestnut heads killed in late spring, to pale 
washed-out specimens with pale yellowish, or yellowish-white heads 
killed in August and September. From this series it was possible to 
shew small series typically representing C. ewilis exilis, C. ewilis tytleri 
and C. ewilis volitans. It would appear from Mr. Williamson’s birds 
that their colours bleach very quickly in the summer, and many of the 
alleged sub-specific differences may eventually prove to be nothing 
more than seasonable changes. 
58. FRANKLINIA RUFESCENS. 
Prinia rufescens, Blyth, J. A. S. B. xvi. p. 456 (1847). 
2 Maprit, P. Siam, 2. 1. 16. 
? juv. Tung Song, P. Siam, 15. 12. Lo. 
I cannot see any difference between these specimens and typical 
birds from Assam. Birds from further South in the Malay Peninsula 
are generally darker. 
59. PHRAGMATICOLA AEDON. 
Muscicapa aedon, Pall. Reise, iii. p. 695 (1776). 
2 Maprit, P. Siam, 30. 12. 15. 
A specimen in perfect plumage. 
60. GRAMINICOLA BENGALENSIS STRIATA. 
Styan. Bull. B. O. C. 1892. p. 6. 
43 2 2 Samkok, C. Siam, 29-31. 8. 15. 
All these specimens agree perfectly with Styan’s striata des- 
cribed by him from Hainan. ‘hey differ from typical bengalengis of 
India and Burma in having the lores, ear-coverts and supercilia pale 
fulvous rather than grey, in having the upper parts much less heavily 
marked with black, especially on the head, so that the general appear- 
ance is paler and more rufous. In striata, also, the white tips to the 
tail feathers are dull and narrow, whereas in bengalensis they are wide 
and conspicnous. The latter difference is not so noticeable in birds in 
worn plumage, as the taiis in both species become very abraded. 
VOL, Ifl, NO. 111, 1919. 
