P.N.E.Z.O. 



22 BIRDS AND MAMMALS OF EAST SIBERIA [ 'vol.'v 



Machetes pugnax (Linn.). 



One adult male, Nijni Kolymsk, May 31, 1912. The first ruff 

 was seen May 28. Afterwards it was common in the forest dis- 

 tricts at Kolyma. No nests were found. 



Not a single curlew nor whimbrel was seen anywhere on the trip. 



Squatarola squatarola hypomelus (Pallas). 



Three adults, two males and a female, were taken at Nijni 

 Kolymsk, May 28, and at Ajan Island, July 23, 1912. 



The first black-bellied plover arrived at Nijni Kolymsk, May 28. 

 It was afterwards found, here and there, along the whole Siberian 

 Arctic coast. At Northeastern Ajan Island, July 23, several pairs, 

 evidently having young birds somewhere about, were found in 

 that part of the island that consists of sand dunes which stretch 

 for miles toward the interior, with mossy patches between the hills. 

 No young could be discovered. At Balagan, also, on July 19, 

 many breeding birds were observed. 



Mathews lately, in ' The Birds of Australia,' has resuscitated 

 Pallas's name for the East Siberian black-bellied plover, on the 

 grounds that " the eastern bird is slightly larger throughout " 

 and " in the winter plumage the eastern form seems to be greyer." 

 Our three adult Siberian birds are very white above, all the white 

 markings being very large and all the blackish markings small. 

 In color, however, they can be matched by occasional American 

 specimens, though the average of American examples is somewhat 

 darker. 



Our skins afford the following measurements (in millimeters). 



