THE BIRDS OF SOUTH-WEST AND PENINSULAR SIAM 345 



496. Dicrurus leucogenys leucogenys Walden. 



Buchanga leucogenys, Walden, Ann. & Mag. Nat. Hist. (4) v, 1870, 

 p. 219 (Nagasaki, Japan) ; A., p. 216 (Mergui to Pakchan) ; B., 

 p. 31 (Junk Seylon) ; C. i, p. 228 (S. Tenasserim and Malay 

 Peninsula). 



Dicrurus leucogenys, F. p. 72 (Trang) ; L., p. 115 (Junk Seylon and 

 Pulo Panjang) ; M., p. 198 (Bangkok and Patiyu). 



Dicrurus leucogenys, var. salangensis, Keichenow, Nomenc. Mus. 

 Hein. 1890, p. 69 (Junk Seylon). 



cJ , 9. Renong River, P. Siam, 21 Feb. 1919 [Nos. 4137-8]. 



2 6 . Mamoh, P. Siam, 27-8 Feb. 1919 [Nos. 4293, 4301]. 



6,2- Nainchut, P. Siam, 25 Feb. 1919 [Nos. 4211, 4223]. 



^ . Tapli, Renong, P. Siam, 2 March 1919 [No. 4336]. 



"Iris red ; bill and feet black". 



Total length s , 273, 278, 260; $ , 274, 260, 268, 272 ; wing 

 6 , 134, 143, 138 ; $ , 144, 131, 138, 141 ; tail c? , 138, 149, — ; $ , 

 148, 135, 140, 138 ; tarsus cS , 19.5, 18, 18 ; $ , 18, 18.5, 20, 18.5, 21 ; 

 bill from gape cS , 30.5, 25, 29 ; $ , 28, 28, 28, 26 mm. 



This species is said to be based on a bird from Nagasaki, but 

 Uehida and Kuroda (Annot. Zool. Jap. ix, 1906, p. 141, footnote) vstate 

 that it never seems to have been obtained in Japan. The distribu- 

 tion given by Walden was Malacca, Cambodia, China and Japan : we 

 have only met with it in the Malay Peninsula and Indo-China in the 

 winter months. The migration route is not by sea, as we have never 

 obtained it on the islands off the Peninsula, and it is unknown in 

 Java or Borneo. Bangs and Phillips consider that typical birds be- 

 long to a southern, darker form, and have separated the northern 

 birds on the grounds of much paler colour and larger light facial 

 area (Buchanga leucogenys cerussata, Bull. Mus. Comp. Zool. Har- 

 vard. Iviii, 1914, p. 302 : Hupeh and Szechuau, type loc. Ichang). 

 Birds collected in the Malay Peninsula and Siam exhibit a consider- 

 able range of colour and extent of facial white, but none are so pale' 

 as the Szechuan example figured by Backwelder (Report on Zoology; 

 Research in China ; Carnegie Inst. Wash, i, pt 2, pi. Ixi). 



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



56, No. 2, 1916. (first and second parts). 



J. Kobinson, Journ. F. M. S. Mus. vii, 1917. M. I. Baker, op. cit., iv, 19-20 (third part). 



K. Kloss, Ibis, 1918. M. 2. Baker, Fauna Brit. Ind., Birds, i, 1923. 

 L. Robinson and Kloss, Journ. N. H. Soc. Siam, 



iii, 1919. 



VOL. V, NO. 3, 1924. 



