100 



130. Regulus calendula calendula. Ruby-crowned King- 



let. — One taken by Rhoads, who saw many along 

 both the Colorado and the Hardy. Specimens from 

 this region are perhaps referable to R. c. cineraceus of 

 Grinnell. 



131. Polioptila caerulea obscura. Western Gnatcatcher. — 



Two collected by Rhoads, who found the species 

 ''abundant and always making a fuss out of propor- 

 tion to its size.'' 



132. Polioptila plumbea. Plumbeous Gnatcatcher. — Not 



uncommon in the desert washes. A male which ap- 

 peared to be breeding was collected seven miles south 

 of Mexican on March 29. 



The Plumbeous Gnatcatcher seems to be a bird of 

 the low brush, while the preceding species is the tree 

 form. 



133. Planesticus migratorius propinquus. Western Robin. 



— A winter visitant in the region. Seen, sometimes 

 numerously by Rhoads, but not observed by the 

 writer. 



134. Sialia mexicana subsp. — ''Numerous" (Rhoads). 



Literature Cited. 

 Barrows, D. P. 



1900. The Colorado Desert. Nat. Geog. Mag., XI, 337-351, map. 

 Caton, J. D. 



1877. The antelope and deer of America. 

 Grinnell, J. 



1914. An account of the mammals and birds of the Lower Colorado 

 Valley, with especial reference to the distributional problems 

 presented. Univ. Calif. Publ. ZooL, XII, 51-294. 



HOFER, E. 



1899. Antelope catching for the zoo. Forest and Stream, August, 

 1899, 143, 144. 

 Horn AD AY, W. T. 



1908. Campfires on desert and lava, 

 MacDougal, D. T. 



1906. The delta of the Rio Colorado. Bull, Amer. Geog. Soc, 

 XXXVIII, 1-16, 



1907, The desert basins of the Colorado Delta. Bull. Amer. Geog. 

 Soc, XXXIX, 705-729. 



