Xo. .3-101 



HYLA ARENICOLOR COPE 



607 



occurrence in San Bernardino County are at hand, 

 but a careful search will undoubtedly reveal its presence 

 there. Throughout this region, its habitat appears to be 

 confined to streams and mountain springs between 1,000 

 and 5,000 feet elevation. Here the writer has found it 

 associated with such trees as Alnus rhombifolia, Platanus 

 racemosa, and Acer macrophyllum and in this state at 

 least it may be regarded as an inhabitant of canyons 

 within the upper sonoran zone. It is apparently more 

 strictly aquatic than the smaller Eyla regilla Baird and 

 Girard, whose range in southern California is, in part, 

 coextensive with it. The former species has never been 

 found far away from the vicinity of water, while the 

 latter has often been seen under vegetation a considerable 

 distance from it. 



The following meager notes indicate that the breeding 

 season of Eyla arenicolor extends from late spring until 

 fall: Two females from Sierra Madre, Los Angeles 

 County, May, 1904, one from Warner's Pass, San Diego 

 County, June 22, 1909, and one from Pine Mountain, near 

 Escondido, San Diego County, Sept. 4, 1906, contain large 

 eggs. There is also a young specimen from La Puerta, 

 San Diego County, collected on June 5, 1909, in which the 

 tail has not been entirely absorbed. 



Miss Dickerson 4 has described the rapid color changes 

 that take place in this species. The writer noted that a 

 light-colored individual which was captured on a granite 

 rock changed to a dark gray mottled with lighter mark- 

 ings when placed for a short time in a covered tin pail. 



The widely scattered record stations given below, some 

 of which are too inexact to be of great value, suggest that 

 Eyla arenicolor lives in suitable places over practically 

 the entire southwestern part of the United States and a 

 considerable portion of the Mexican tableland as well. 

 Little has been written concerning its habitat preferences 

 within this region. Stejneger 5 has found it in the Grand 



4 The Frog Book, Doubledav, Page and Company, 1906, p. 122. 



