172 THE MIGRATIONS OF BIRDS 



was easily apparent. Many northern shore-birds 

 however linger in the central portion of South 

 America until May, when they must drive swiftly 

 northward, with comparatively little rest, to reach 

 their northern homes by the opening of the brief 

 period of summer. 



There is also evident migration among a few 

 South American forms that belong to the shore- 

 bird group. What is known in Spanish as the 

 Chorlito inviernOy " the little winter plover" {Zonibyx 

 modes tus)y and the Falkland plover {Charadrius 

 falklandicus)^ nest regularly from Patagonia south- 

 ward, and with the approach of cold weather migrate 

 north in company with foreign species as far as the 

 pampas, but there linger. With them come a few 

 individuals of a larger form {Oreopholus r. ruficollis). 

 These southern species are not known however to 

 reach the Equator in their northward journeys. 

 Migratory flight of a similar nature is known in the 

 Paraguayan jack-snipe (Capella paraguaiae)^ but its 

 extent has not been definitely ascertained. 



Brief mention has been made previously of mi- 

 gration from Arctic regions into the oceanic islands 

 of the South Seas, a wintering ground that reaches 

 to the eastern atolls of Polynesia, far distant from 

 any continent. The Pacific golden plover and the 

 turnstone regularly perform this flight, while with 

 them come the bristle-thighed curlew, the wander- 



