NON-INDIGENOUS BRITISH BIRDS. 337 



whatever is known of the habits of this species during 

 the breeding season, or of its nest and eggs. 



Family CHARADRIID.E. Genus Tringa. 



Sub-family SCOLOPAClNyE. 



CURLEW SANDPIPER. 



Tringa subarquata {Giildenstadt). 



(British : Fairly common spring and autumn coasting migrant ; few, 



winter.) 



The breeding area of this species is almost unknown. 

 Middendorff observed this species in summer on the 

 Taimyr peninsula. Other nesting grounds may be 

 probably on the Liakoff Islands, and on undiscovered 

 lands in the North Polar Basin. To the present writer 

 it seems by no means impossible that some individuals 

 of this species may breed in the Antarctic regions. 

 Nothing is yet known of its nest and eggs. 



Family CHARADRIID.E. Genus Tringa. 



Sub-family SCOLOPACINyE. 



KNOT. 



Tringa canutus, LinncBus. 



(British : Common spring and autumn coasting migrant, especially 

 the latter ; few, winter.) 



The breeding grounds of this species are situated in the 

 North Polar Basin, mostly, if not entirely, above lat. 8o\ 

 The Knot probably breeds on all suitable land within 

 this area up to the Pole. That the bird is so rare in the 



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