196 VISCOUNT "WALDEN ON THE BIEDS 



MOTACILLID.E. 



MOTACILLIN^. 



BuDYTES, Cuvier. 



114. BuDYTES VIRIDIS. 



Green Wagtail, Brown, Illustr. p. 86, pi. 33, " Ceylon." 



Motacilla viridis, Gm. S. N. i. p. 962, no. 81 (1788), ex Brown; v. Martens, J. f. O. 186G, p. 10, 



no. 28, " Manilla." 

 ? Motacilla flava, ap. Kittlitz, Lutke, Voy. (Postels), iii. p. 327, "Manilla" (1836). 



Observed by Dr. v. Martens at Manilla, both alive in the open country and preserved 

 in the Military Library. 



Calobates, Kaup. 



115. Calobates melanope. 



Motacilla melanops, Pallas, Reisen B,ussisclien Reichs,iii.p. 696, no. 16, " Dauria" (1776) ; Zoogr. 



Rosso-Asiatica, i. p. 500, no. 135. 

 Motacilla bistrigata, Raffles, Tr. Linn. Soc. xiii. p. 312, " Sumatra" (1821). 

 Motacilla xanthochistus , Hodgs. Gray's Zool. Misc. p. 83, "Nipaul " (1844). 

 Pallenura javensis, Bp. Consp. i. p. 250, "Java" (1850). 



Calobates sulphurea (Bechstein), Jerd. Birds of India, ii. p. 220, no. 592, " All India and Ceylon." 

 Calobates melanope (Pallas), Swinh. P. Z. S. 1871, p. 364, no. 202, "China, Formosa, Hainan." 



Hab. Luzon, January ; Zebu, April [Meyer). 



Mr. Swinhoe {I. c.) has already remarked that the species of Calobates found in China, 

 Formosa, and Hainan has a constantly shorter tail than the European bird, and has 

 separated it under the title given by Pallas to the species observed in Dauria. My own 

 observations fully support Mr. Swinhoe's conclusions, which apply to the Philip- 

 pine bird also, as well as to all those I have examined from continental India. Although 

 a small difference in the length of the tail is, by itself, a character too insignificant 

 whereon to base a species, still it must be recollected that the lines of migration of the 

 two forms are perfectly distinct, the short-tailed birds breeding in Northern Asia 

 and visiting Southern Asia and its islands, those with the long tails breeding in 

 Northern Europe and wintering in Southern Europe, Asia Minor, and Northern 

 Africa ^ Where the two races osculate remains an interesting point for future investi- 

 gation ; and it is not impossible that the race which winters in Abyssinia will be found 

 to breed in Siberia. 



' The great body of the migrants is referred to. Many individuals are known to halt and breed at inter- 

 mediate points. 



