432 MR. E. C. STUART BAKER ON 
one or the other, some are halfway between the two, whilst others 
are more one than the other. Certainly, if we judge from the birds 
obtained in these districts, we should say that they were the result 
of hybridization rather than specimens of two forms intergrading. 
On the other hand, one finds individuals of each form in the 
area inhabited by the other ; as for instance in Calcutta, specimens of 
C. affinis occur, and again in Cachar and Sylhet I have seen almost 
equally typical specimens of C. orientalis. 
For the present I leave this Roller under a bi-nomial. 
178. EURYSTOMUS ORIENTALIS CALONYX. 
Eurystomus calonyx, Sharpe, P. Z. 8. 1890, p. 551, Nepal. 
$ Pak Jong, E. Siam, 18.8.15. 
2 Muak Lek, E. Siam, 25.8.15. 
? Klong Wang Hip, P. Siam, 30.9.15. 
The three specimens obtained by Mr. Herbert in Siam, agree 
well with others in the British Museum from the same country 
They are not very typical calonyx, but are nearer this form than 
orientalis, The secondaries and greater wing-coverts have a fair 
amount of blue on them, but the tails have very little. The dif- 
ferences between EF. 0. calonyx and E. o. orientalis are not very 
great, how slight they are is best realised when we find Sharpe often 
naming two birds from the same place, the one by one name and the 
other by the second name. 
179. MEROPS SUPERCILIOSUS PHILIPPINUS. 
Merops philippinus, Linn. Syst. Nat. 13th Ed. 1, p- 183 (1787). 
Type locality, Philippine Islands. 
$ Samkok, C. Siam, 21.6.15. 
° Paknam, C. Siam, 14.2.16. 
180. MELITTOPHAGUS ERYTHROCEPHALUS ERYTHROCEPHALUS., 
Merops erythrocephalus, Gmelin, Syst. Nat. 1, p. 463 (1778). India. 
¢ Klong Wang Hip, P. Siam, 2.10.15. 
Gmelin’s deseription scems to be quite satisfactory, and there 
is no reason why his name should not be used. The original des- 
eription of Apiaster indicus erythrocephalus as given in Brisson 
(Ay. 4, p. 563 n, 13, p. 44, f. 3A) is also equally so. 
JOURN, NAT, HIST, SOC, SIAM, 
