THE BIRDS OF SOUTH-WEST AND PENINSULAR SIAM. 



77 



ARDEIDAE. 



Heeons and Bitterns. 



Tail feathers 12 



Tail feathers 10 . . 



Feathering on tibio-tarsus not extensive 

 Feathering extiending nearly to heel 



Middle toe and claw longer than tarsus 

 Middle toe and claw shorter than tarsus 



Edge of mandibles serrated 

 Edge of mandibles not serrated . . 



With ornamental plumes to head, no dorsal train 

 With no ornamental plumes, a dorsal train . . 



Crown of head slate colour 



Crown of head white 



Bill (culmen) not, or only slightly, exceeding middle 



toe and claw ; tarsus more than 5 inches . . 

 Bill (culmen) much exceeding middle toe and claw ; 



tarsus less than 4 inches 



Bill without serrations 

 Bill with serrations . . 



Culmen longer than tarsus 

 Culmen about equal to tarsus 

 Culmen shorter than tarsus 



Bill longer than middle toe and claw ; plumage 



with no white 

 Bill equal to middle toe and claw ; plumage mainly white 

 Bill shorter than middle toe and claw 



Smaller, head and neck brownish 

 Larger, head and neck blackish 



Middle toe and claw equal to tarsus 

 Middle toe and claw exceeding tarsus 



Size larger, wing over 6 inches 

 Size smaller, wing under 6 inches 



TarSus feathered to heel ; primaries blackish 

 Tarsus not feathered to heel; primaries chestnut 



Pyrrherodias piivpurea manilleJisis. 



Mesophoyx intermedia. 



Ardea sumatrann. 

 Ardea cinerea jouyi. 



Herodias alba. 

 Garzetta garzetta. 



Demiegretta sacra. 

 . . Nycticorax nycticorax. 

 Gorsachius melanolophus. 



Butorides javanica. 



. .Buhulcus coromandus. 



Ardeola grayi. 

 Ardeola bacclius. 



Botaurtis stellaris. 

 Dnpetor flaricollis. 



Ardetta sinensis. 

 Ardetta cinnamomea. 



2 



12 



9 

 10. 



11 



13 



14 



101. Pyrrherodias purpurea manillensis Meyen. 



Ardea purjmrea, vav. manillensis, Acta Acad. Leop-Carol. xvi, 



Suppj., p. 102. 

 Ardea purpurea, A., p. 472 (Tavoy). 

 Phoyx manillensis, D., p. 80 (Patelung). 

 Ardea manillensis, G., p. 152 (Ratburi and Petchaburi). 



6 ad. Mamoh, Pakchan, Peninsular Siam. 27 February, 

 1919. (No. 4295). 



I. Gyldenstolpe, Kungl. Sv. Vet. Akad. Handl. M. Baker, Journ. N. H. Soc. Siam, iii, 1919. 



56, No. '2, 1916. (first part). 



J. Eobinson, Journ. F. M. 8. Mus. vii, 1917. Baker, Journ. N. H. Soc. Siam, iii, 1919. 



K. Kloss, Ibis, 1918. (second part). 



L. Robinson and Kloss, Journ. N. H. Soc. Siam, M. I. Baker, Journ. N.H. Soc. Siam, iv, 1920. 



iii, 1919. (third part). 



VOL. V, NO. 1, 1921. 



