Plate 51 



Upper : Adult mountain plover approaching its nest, presented by the Colo- 

 rado Museum of Natural History, photographed by Mr. W. C. Bradbury, and 

 referred to on page 264. 



Lower : Mountain plover attending its young, Weld County, Colo., June 

 4. 1911. presented by Mr. Edward R. "Warren. 



391 



