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BULLETIN 17 2, UNITED STATES NATIONAL MUSEUM 



form, as the male from Singapore, taken May 22, is large like the rest 

 of the series but is somewhat immature. It may have been a wanderer 

 after the breeding season, as immature herons are known to wander 

 thus. If so, it must have been hatched the previous summer as it 

 has almost acquired adult plumage. The resident form of the Malay 

 Peninsula and southern Siam may be Butorides javanicus javanicus, 

 but from the evidence at hand this is not substantiated. 

 Table 1 gives the measurements of the various series. 



Table 1. — Measurements of Butorides javanicus actophilus 



Specimens 



Wing 



Culmen 



4 males from South China 



4 males from western Siam, Mergui Archipelago, and Malay Penin 

 sula --- 



5 males from Celebes 



8 males from the Philippines 



2 males from Simalur Island (one the type of kastopterus) 



1 female from Trang 



2 females from North Pagi Island (one the type of actophilus) 



2 females, Java - 



9 females from the Phnippines 



There seems to be no difference in size between the sexes. As a 

 matter of fact, the Siamese and Malay Peninsula bird is somewhat 

 intermediate between the South China form and that of Java, but 

 nearer the former. 



I have not examined any authentic specimens of B. j. amurensis. 

 La Touche *^ gives the measurement of a male as wing 214 and culmen 

 64 mm, and of a female as wing 209 and culmen 65 mm. Hartert's 

 measurement for the wing is 200-214 mm.^^ Certainly I have meas- 

 ured no specimens with such long wings from Siam. B. j. amurensis 

 is migratory. It may migrate to the eastward of Siam to its winter 

 quarters. A stray might occur occasionally in Peninsular Siam or even 

 farther north in eastern Siam. 



Another form of green heron that may occasionally occur as a strag- 

 gler in Peninsular Siam is Butorides javanicus spodiogaster Sharpe, 

 of the Andaman and Nicobar Islands. It is darker gray on the under 

 surface and has been taken as a straggler in the Philippines. 



Gyldenstolpe *" reports B. j. actophilus as generally distributed 

 throughout Siam, though less abundantly in the northern districts; 

 Robinson and Kloss "^ state that it is abundant eveiywhere on the 

 coast of the Malay Peninsula. Probably it is partially migratory in 

 the northern part of its Siamese range. 



•' A handbook of the birds of eastern China, vol. 2, pt. 6, p. 456, 1934. 

 " Die Vogol der paiaarktischon Fauna, Band 2, Heft 4, p. 1249, 1920. 

 M Ibis, 1920, p. 7G9. 

 " Ibis, 1911, p. 15. 



