l *••_':>. Townsend, Birds Collected in Lower California 3 



The following- species and subspecies of land birds are peculiar to the 

 island : 



Polyborus lutosus PipUo consobrinus 



Colaptes cafer rufipileus Salpinctes obsoletus guadeloupensis 



Carpodacus ampins Thryomanes brevicauda 



J unco insularis Regulus calendula obscurus 



There are three small islands in the San Benito group which lie 

 about 15 miles west of Cedros Island. West Benito, the largest island, 

 has a central height of 661 feet. All lack fresh water and are uninhabited. 

 There are two endemic birds, Passerculus rostratus sanctorum and Carpo- 

 dacus mcgregori. 



Cedros Island, about 10 miles from the neatest point of the main- 

 land, has a length of 21 miles and a width of from 3 to 9 miles. It is 

 mountainous, the highest peak being nearly 4,000 feet. The island is 

 sparsely wooded, with some cedars and pines on the higher elevations. 

 Cedros has a few springs of fresh water and has been temporarily 

 inhabited by miners. The only land bird peculiar to the island is 

 Thryomanes bewickii cerroensis. 



Tiburon is the largest island in the Gulf; it is thirty miles long by 

 fifteen in width, and has a height of 4,000 feet. 



The fauna of Tiburon Island has been derived chiefly from the main- 

 land of Sonora, from which it is separated by a channel varying from 

 one to three miles in width. 



None of the thirteen species of land birds secured on Tiburon Island 

 are referable to races belonging to Lower California. The width of the 

 Gulf of California averages considerably greater than that of the 

 peninsula, exceeding 100 miles in the latitude of Guaymas, its central 

 portion. The following land birds were taken on Tiburon Island : 



Passeixidus rostratus rostratus Colaptes chrysoidcs mcarusi 



Pipilo fuscus jamesi Centurus uropygialis uropygialis 



Cardinalis cardinalis affinis Toxostoma bendirei 



Phainopepla nitcus Auriparus flaviceps lamprocephalus 



Dryobates scalaris cactophilus Heleodytes brunneicapillus brunneicapil- 



Myiarchus cinerascens cinerasceus lus 



Empidonax difficilis diffieilis Polioptila plumbea 



One of the birds in the above list {Pipilo fuscus jamesi) is described 

 elsewhere in this paper as a new subspecies. It is probable that this large 

 and mountainous island contains other unknown birds. It had not 

 previously been visited by ornithologists. Tiburon is inhabited by Seri 

 Indians believed to be dangerous to small parties. Science as yet knows 

 nothing of the interior of this island. 



