42 BIEDS OF TENASSERIM. 



[I only met "with this race at Tavoy ; they appeared for a few 

 days in the latter end of April, and the early part of May, in 

 great numbers, and then disappeared entirely ; but whether 

 moving north or south, I am unable to say. — W. D.] 



See my remarks as to the migrations of this race, S. F., III., 

 41. 



I have carefully compared a very large series of this bird 

 from various localities in Burma and Eastern Bengal, with 

 specimens of ca/iirica from Damietta on the Nile. The two are 

 certainly very close, but I thiuk that they are generally separ- 

 able. The great majority of tytleri are much paler beneath, 

 and even the very deepest colored ones are not quite so deeply 

 colored as all my specimens of cahirica. Again, the black blue- 

 glossed pectoral band appears, to judge from my few specimens, 

 to be always continuous on the breast of cahirica, whereas in 

 tytleri I have found no single specimen in full deep under- 

 plumage at all approaching in color to cahirica, which has not 

 the pectoral band to a great extent interrupted or broken in 

 front. 



I can discover no other differences ; in size the birds as a 

 body do not differ, nor is there any constant difference in the 

 amount of white on the lateral tail feathers, though, as a 

 general rule, there is rather less white in the case of tytleri ; 

 nor again is there any constant difference in the sheen of the 

 upper parts. In tytleri, no doubt, it is not unfrequently 

 much more purple violet than it appears ever to be in cahirica, 

 but again many birds are undistinguishable in this matter from 

 the latter. 



"Whether under these circumstances tytleri should be kept 

 distinct must remain a matter of opinion. I am inclined to think 

 that they should be, because, while the habitats are separated by 

 many thousand miles, any specimen of the one can, I think, be 

 separated at once from the other if the color of the lower parts 

 and the continuity of the pectoral band are duly taken into 

 account. 



82 quint. — Hirundo horreorum, Bart. 



Lord Walden notes a specimen from Tonghoo as undistin- 

 guishable from Californian examples. 



Some young specimens of H. tytleri appear to me not easily 

 separable from this species. They have the forehead, throat and 

 upper part of the breast chestnut, and the rest of the lower 

 surface a pale yellowish brown, just as in /wrreorum, and they 

 want the breast band. The wing, however, is shorter. It 

 seems to me not impossible that Lord Walden's supposed 

 horreorum may prove to be only this stage of the immature 

 tytleri. 



