98 



115. Dendroica auduboni auduboni. Audubon's Warbler. 



— Seen once or twice in willows along the irrigation 

 canals south of Mexicali on March 29. Rhoads found 

 the species exceedingly abundant in the delta during 

 February. 



116. Dendroica nigrescens. Black-throated Gray War- 



bler. — A single male in full summer plumage was shot 

 in the open desert near our first night camp on the 

 morning of March 30. 



117. Wilsonia pusilla chryseola. Golden Pileolated War- 



bler. — A single male was collected near the main 

 irrigation canal, south of Mexicali, on April 19. 



118. Anthus rubescens. Pipit. — Rhoads saw a very few 



Pipits along the Hardy, and obtained one specimen 

 on February 18. 



119. Mimus polyglottus leucopterus. Western Mocking- 



bird. — Common on the ranches south of Mexicali, 

 and equally so on the western slopes of Pattie Basin. 

 The birds sang morning and evening, and during 

 most of the night. They showed every evidence of 

 breeding, and on April 10 I found a nest with four 

 half-grown young. It was situated about five feet' 

 above the ground in a broken mesquite. The site 

 was in a low part of the desert, on the borders of a 

 great creosote tract near the base of the Pinto Moun- 

 tains. The distance to the Hardy, the nearest flowing 

 water, was not less than sixteen miles, and the bare 

 flood-plain of the Laguna Salada lay between. 



The Mockingbirds were much more abundant in 

 the higher parts of the Wash Association, near the 

 foot of the Tinajas, than on the lower slopes, although 

 we observed several at the Tres Pozos. A male was 

 collected on April 9. 



Rhoads saw and collected three examples at Coco- 

 pah Mayor, and noted that they were beginning the 

 song season. 



120. Dumetella carolinensis. Catbird. — '^I feel sure that 



this bird was seen and heard two or three times along 

 the Hardy river" (Rhoads). 



