166 BRITISH BIRDS. [vol ix. 



and the mouths of the Golchika and Mezenchyne rivers, 

 the dry tundra comes right doMn to the mudliills that 

 bound the river-bed. Tlie flock that I saA\' may veiy 

 well have been on passage from the unexplored tundras 

 that he nearer the sea around the Krestovsldy Islands 

 or Dickson Harbour, or even from the Pyasina River, 

 of which we know little except that its she res are level 

 and SA\ampy. A little evidence that the spring 

 migration at least is down the course of the river is 

 supplied by Mr. Popham, who saw about ten Grey 

 Plovers at Vorogova (latitude 61°) on June 11th.* 

 At first sight migration routers in Northern Asia, both 

 for geographical and climatic reasons, appear simple 

 compared to those in Europe, with its more variable 

 meteorological conditions and infinitely more complex 

 physical features. Nevertheless, from the scanty records 

 that can be consulted, I venture to think that the rout^ 

 followed by certain species to and from the Yenesei 

 delta, may turn out to be much more complicated than 

 appears at first sight, especially during the spring 

 migration. 



* Ibis, 1898, p. 513. 



