MIGRATORY BIRDS . SPRING 125 



course reach our shores. Good examples of 'migrants 

 hopelessly lost at this season are furnished by the 

 occurrence of such species as the Desert Wheatear at 

 the Pentland Skerries, Savi's Warbler at Fair Isle, the 

 Subalpine Warbler at St Kilda and Fair Isle, the 

 Red-rumped Swallow at Fair Isle, and many other 

 instances equally astonishing of the appearance in our 

 islands of waifs and wanderers from far-off lands. 



Other casual visitors at this season belong to species 

 in which the nomadic habit is strongly developed, such 

 as the Rose-coloured Pastor or Starling, and Pallas' 

 Sand-Grouse. The visits of such species are, of 

 course, more or less erratic, and the birds appear at 

 irregular intervals and in varying numbers. 



[Appendix I. 



