THE BIRDS OF SOUTH-WEST AND PENINSULAR SIAM. 143 



APID/E. 



Swifts. 



f Shafts of tail feathers stiff, ending in bare points . . . . . . 4 



1 Shafts of tail feathers normal . . . . . . . . 2 



I Tail very deeply forked ; crested or with ornamental plumes on the head ; 



' sexes somewhat different . . . . . . . . . . 5 



j Tail even, or at any rate not deeply forked ; not crested or with ornamental 



1 plumes on the head ; sexes similar . . . . . . . . 3 



I" All four toes directed forwards . . . . . . . . . , 6 



\ Two toes directed forwards, two backwards Tachornis b. infumatus 



(Three toes directed forwards, one backwards , . . . . . 7 



(Wing over 7 inches . . . . . . Chaetura gigantea indica 



I Wing under 5 inches ., .'. ' C. leucopygialis 



f Eyebrow and moustachial plumes white . . Hemiprocne c. comatn 



(Eyebrow and moustachial plumes not white H. longipennis harterti 



f Abdomen with white tips to feathers .. Apusp. pacificus 



t Abdomen uniform blackish .. .. A. affinis subfarcatiis 



(Upper surface steel blue ; belly with white 



edgings to feathers . . . . Collocalia linchi elachyptera 



i Upper surface sooty brown ; belly without white edgings to feathers . . 8 



(Wing 5 inches or more . . . . C. innominata 



t Wing less than 5 inches . . . . C. francica germaini 



Collocalia linchi elachyptera Oberh. 



Collocalia linchi elachyptera, Oberholser, Proc. Acad. Nat. Sci. 



Philad. ] 906, p. 207 (Bentinck Id., Mergui Archipelago). 

 Collocalia linchi, Blyth, Birds of Burma, p. 35 (Mergui Arch.). 



Certain to occur in the neighbourhood of the Pakchan 



Estuary within Siamese territory, though no specimens are actually 



on record, 



Collocalia innominata Hume. 



Collocolia innominata, Hume, Stray Feathers, i, 1873, p. 294 (South 

 Andaman Id.) ; A, p. 49 (Mergui and Bankasoon) ; J., p. 154. 



Collocalia maxima (nomen nudum), Hume, Stray Feathers, iv, 

 1876, p. 223 (Mergui and Bankasoon). 



This large Cave-Swiftlet will probably be found abundant on 



many of the islands on both coasts of Peninsular Siam. 



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



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



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



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



U. 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. 2, 1922. 



