1870.J ON TWO INDIAN TELLOW-HEADED WAGTAILS. 95 



BUCH.U'GA MOUHOTI, 11. sp. 



Belongs to the " Ashy Drotigos " (P. Z. S. 18G6, p. 546)*, and was obtained by M. Mouhot 



in Cambodja. Above ashy grey or plumbeous, rather darker than in B. leucophcBa, ex Java. 



Under surface lighter ashy, but darker than in the Javan species. Upper surface of middle 



rectrices grey, as in the Javan bird. Wing 5| inches ; outer tail-feathers 5f , middle tail-feathers 



^^- 5f ; difference between outer and middle pairs 1-| ; bill from nostril full | of an inch. 



A species intermediate in dimensions and colouring between B. leucojjhwa and B. ivjrrhops, 

 Hodgs. 



BUCHANGA WALLACEI, n. sp. 



Above dark ashy green, with a silky gloss. Underneath a shade lighter, but without any 

 gloss, except on the breast. Upper surface of rectrices glossy greenish brown ; no traces of 

 ash-colour. Bifurcation of the tail moderate. Wing 5 inches to 5^ ; outer tail-feathers 5 inches, 

 middle pair 4 inches. 



Described from specimens obtained in Lombock by Mr. Wallace. 



Letter relating to the Indian Yellow-headed Wagtails, from Viscount Walden, P.Z.S., 



to the Editor of ' The Ibis ' (April 1870). 



Sir, — In a letter addressed to you by Mr, Hume (Ibis, 1870, p. 142) that gentleman announces 

 the existence in India of two species of yellow-headed Wagtails. Not having seen the examples 

 on Avhich this statement is founded, I shall not venture an opinion as to its accuracy ; but, with 

 your permission, I wish to make the following observations on the general subject: — 



1. Motacilla aureocapiUa is Lesson's title, not Vieillot's. 



2. Lesson's diagnosis (Tr. d'Orn. p. 422) contains no character inconsistent or conflictino' 

 with the characters given by Pallas of M. citreola. 



3. Lesson gives no measurements. 



4. Bonaparte and Mr. G. R. Gray identified II. aureocapiUa, Lesson, with M. citreola, 

 Pallas. 



5. Dr. Pucheran, after a critical comparison of Lesson's type specimens in the Paris Museum 

 (Arch, du Mus. vii. p. 377), pronounced it to be the same as M. citreola. Pall. 



G. An adult male of Jf. citreola. Pall., from the shores of Lake Baikal, in my collection has 

 the wing 3-5 in. long. 



If two distinct specimens of ycJlow-headed Wagtails do inhabit India, it will have to be 

 determined whether either belongs to Pallas's species, and, if either, which of the two. These 

 facts being ascertained, it must then be decided to which of the two Mr. Hodgson's title of 

 Budytes calcaratus applies; and if an untitled species remains, it will require a new name. 



* [Antea, pp. 23, 24.— Ed.] 



Ibis, 1870, 

 p. 293. 



