MAMMALS OF THE MEXICAN BOUNDARY. 133 



and has an altiiude of 775 meters (2,543 feet), the highest neighbor- 

 ing point reaching 1,-1:10 meters (4,()"2() feet) in height. Mountain 

 Spring is about 6.5 kilometers (1 miles) north of Monument No. 231, 

 135 kilometers (81 miles) west of the Colorado River, and 92 kilo- 

 meters (57 miles) east of the Pacific Ocean. There are some rushes 

 and a few mesquite and screw-bean trees around the spring, and 

 much underbrush, yucca, cacti, and ephedras on the surrounding hills. 

 A little higher up the slopes the juniper zone begins, and vegetation 

 becomes more luxuriant. The mammals that were collected here 

 were of much interest, as some of them were intergrades between the 

 forms of the Colorado Desert and those of the Pacific Coast Tract. 

 My party remained at this place from May 9 to IG, 1891. 



Reptiles and hatrachians. — The following-named species have been 

 taken on the east side of the Coast Ranffe : 



Lizards. 



Crotaphytus colhiris (Say). 

 Saiiromalus atcr Dunu'ril. 

 CaJIisainii)^ drdcoiioides rrntrnlix (llal- 



lowell). 

 Vta meanisi Stejneger. 

 Ufa staiishuriana Baird and Girard. 



Sceloporus orciitti Stejneger. 

 Sceloponis vanderibiirffianus Cope. 

 Phrfiuoftnnia hhtinrillci Gray. 

 Zahlcpsis hciishairi Stejneger. 

 Vrrticaria hrhJlufil Stejneger. 



jSna/.-es. 



Lichamna roi^rnfiifica Cope. 

 Zamensis flagellum ftagclhim (Shaw). 

 Rhinecliis elcc/ans (Kennioott). 

 Pityophis catenifer (Blainville). 

 Hypsiglena (jclnorhijneha Cope. 



Crotalus riihrr Cope. 



Crotalns couiiurntus /wr'/frr (Baird and 



Girard). 

 Crofoliix niifcliclli Cope. 



Batraeliktn.s. 

 Hyla regiUu Baird and Girard. | Biifo rolumhienKii^ Baird and Girard. 



Station No. 8(). — West side, near summit of Coast Range moun- 

 tains, San Diego County, California. This station is 5 kilometers (3 

 miles) north of Monument No. 232, 138 kilometers (8G miles) west of 

 the Colorado River, and 89 kilometers (55 miles) east of the Pacific 

 Ocean. Altitude, 950 meters (3,117 feet). The writer and Mr. Holz- 

 ner were at this place May 16 and 17, 1891. 



Flora of Wo[/on Pass. — This pass reaches the zone of California 

 juniper and single-leaf piiion, and belongs to the Upper Austral Life 

 Zone, barely penetrating the Transition Zone on the highest neighbor- 

 ing peaks, which do not rise above 1.410 meters (4,626 feet)." To the 

 west is the beautiful Jacumba Valley. The following is a list of the 



aA list of the trees and shrubs of the upper Austral (Transition) and lower 

 Boreal (Canadian) zones is given in the description of Station No. 02. aI)Out 30 

 kilometers (10 miles) north of Monument No. 240, in a higli part of the Coast 

 Range. 



