54- MR. C BODEN KLOSS'S FURTHER NOTES ON 



Williamson has obtained a specimen from Pran, SW. Siam, in June, 

 which seems to indicate that the bird is a true resident. Bartels 

 states that longus is in good plumage in Java at the middle of the 

 year and I have found it plentiful from January to April, so we 

 may infer that it is continuously present there. If it migrated we 

 should expect to meet with it at times in the well-explored 

 countries bordering its line of travel, but it is unknown from 

 Sumatra, Borneo or the Malay Peninsula south of Victoria Point, 

 . Tenasserim. 



The case of caihoeca is different ; it is not yet correctly. re- 

 corded from Annam (for Buchanga atra caihoeca, Ibis, 1919, p. 610, 

 is B. a. longus), but it is known from the other areas mentioned 

 above from November to May only, and it is highly probable that 

 it is merely a winter visitor in Southern Indo-China, to which it 

 comes to escape the cold season of Southern China. 



A number of grey drongos from Siam of Buchanga 

 leucophaea type are in Mr. Williamson's collection and, with others 

 available, form a fairly large series. On laying out this material 

 by characters it falls into two groups : — (a) larger and, on the 

 whole, darker birds : (b) paler, smaller specimens ; and it is evident 

 that two forms occur. 



Fourteen specimens of the larger race measure : — 

 Wings, 134 to 140; average 140 mm. 

 Tails, 140 to 168; average 154 mm. 

 The bills from gape range as long as 28.5 mm. 

 Most of these specimens, which were collected between 

 October and February, come from Bangkok, but some were obtained 

 as Car south as Victoria Point and east as Lat Bua Kao and Koh 

 Chang Id., Chantabun. I regard them as probably belonging to 

 ~f- Baker's race B. 1. hopwoodi, extending from Eastern Bengal to 

 Yunnan (Nov. Zool. xxv, 1918, p. 294) which thus seems to migrate 

 in winter as far south and cast as the above localities, but apparent- 

 ly no further. Hume and Davison's specimens of Buchanga 

 pyqrrhops from Tenasserim are probably the same (Stray Feathers, 

 vi 3 p. 216). 



JOX7RN. NAT. HIST. SOO. SIAM. 



