NOVITATES ZOOLOGICAB XXV. 1918. 293 



there is any correisponding variation in colour, but in Burma, as I have already 

 said, although dark and hght birds are to be found throughout, from north to 

 almost the extreme south, both forms do grow Ughter towards the south, wliilst 

 in Java there are apparently only very pale, blue-grey birds. 



However we divide this species into geographical races, our divisions 

 cannot but be rather arbitrary, but it appears to me that the races inhabiting 

 the following areas can be separated with sufficient ease to make them acceptable 

 as subspecies. At the same time, more especially in India, it must be 

 remembered that the extremes overlap greatly and that individual variation is 

 exceptionally great in species of this family. 



(1) Dicrurus leucophaeus leucophaeits. 



Dicrurus leucophaeus Vieillot, xVoiii'. Diet. (VHist. Nat., nouv. ed.. ix. p. 587. 1817. ex Lcvaillant, 

 Le Droiigri, Ois. d'Afrique, pi. 170. 



Type Locality : Java. 



A small bird of a very pale coloration, with a very blue-grey tint. The 

 tail is generally conspicuously shorter than the wing, a proportion found only in 

 this Javan form. Also found on Bah by Doherty and Stresemann (Tring 

 Museum). 



Wing average, 127 mm. ; tail, 123 mm. 



(2) Dicrurus lencopJiaevs walkicei. 



Buchanga wallacei Walclen. Ann. & Mag. Sat. Hist. (4) v. p. 220 (1870). 



Type Locality : Lombok. 



A small bird l)ut darker than IcucopJiaevs and with a comparatively longer 

 tail. I have not seen a sufficient number of these birds or of the next form to 

 be able to give average measurements. 



(3) Dicrurus leucophaeus palaivanensis. 

 Bnchanga palawanensis Whitehead, Ibis. 1890. p. 47. 



Type Locality : Palawan. 



A very small bird with wing and tail about equal in length and under 

 120 mm. This is the smallest of all the geographical races of leucophaeus and 

 distinguishable by size alone. 



(4) Dicrurus leucophaeus disiurbans, subsp. nov. 



Type: <J, No. 86.3.1.2044; ?, No. 86.3.1.2040. British Museum. 



Type Locality : Amherst. 



This bird is just about the same in size as the Javan form, but is distinctly 

 darker and has a proportionately longer tail. 



Habitat. It is found in the Malay Peninsula as far north as Bangkok and 

 extends east into Siam, though how far is at present unknown. Where disturbans 

 meets true leucophaeus in the south it is impossible to say, but birds from Johore 

 and Singapore are imdoubtedly true leucophaeus. 



I have been unable to find any name which appUes to this bird, Blyth's 

 intermedials referring to the bird from the extreme south and not to this form. 



Wing average, 127 mm. ; tail, 131 mm. 



