MAMMALS OF THE MEXICAN BOUNDARY. K>7 



most of the mountain masses to the westward arc composed, until, 

 in the ('oast Range of California, it is replaced by fine-grained 

 granite. The Pajaritos also contain effusive rocks — rhyolite and 

 basalt — in abundance. 



Fauna of Nogales. — Owing to its location on the International 

 Boundary and the only railroad that enters Mexico west of the Rio 

 Grande, this station has attracted several trained field naturalists, 

 among them Mr. I\ L. Jouy, to whose efforts T am mainly indebted 

 for the following - list of the reptiles hitherto collected at Nogales: 



Sceloporus clarkii Baird and Girard. 

 Phrynosoma cornutum (Harlan). 

 Anota modesta (Girard). 



Eublepharis variegatus (Baird). 

 Cnemidophorus gularis gularis Baird 



and Girard. 

 Salvadora grahamice Baird and Girard. 

 Rhinochilus lecontei Baird and Girard. 

 y;/(//<x eurywanthus Kennicott 



T< rrapene sp. 



Kinosternon sonoriense Le Conte. 

 Ctenosaura multispinis Cope. 

 Crotaphytus collaris (Say). 

 Grotaphytus wislizenii Baird and 



Girard. 

 Uta stansburiana Baird and Girard. 

 Uta symmetrica Baird. 

 Sceloporus jarrovii Cope 

 Sceloporus torquatus poinsettii Baird 



and Girard. 



Station Xo. 43. — Corner Monument No. 127. where the Boundary 

 leaves the parallel 31° 20', 482 kilometers (300 miles) west of the 

 Rio Grande and 377 kilometers (234 miles) east of the Colorado 

 River; altitude, 1,592 meters (5,223 feet). This station is in the 

 midst of the Pajaritos Mountains, which rise from a base level of 

 1,100 meters (3.000 feet) to the altitude of 1,830 meters (5,924 feet). 

 These rugged and little-known mountains have tuner received from 

 zoologists and botanists the attention which their importance merits. 

 I was absent in Texas when the detailed survey of them was made by 

 the International Boundary Commission. Subsequently, when at- 

 tached to the Monument-Building Party of the survey, they were but 

 hastily examined from Stations 42 and 44. Their flora is said to be 

 unusually varied, and the name, meaning "little birds" mountains, 

 is justified by the abundance of small birds during the breeding 

 season, which is doubtless due to the considerable number of water- 

 ing places. (Plate XII. fig. 1.) To the. north of these mountains, 

 which extend from Monument Xo. 120 to Monument Xo. 1 12, is a 

 low, open country, which was crossed in several directions by myself 

 in going from Nogales to Tucson, from Tucson to Warsaw, and thence 

 to La Osa by way of Oro Blanco. Arivaca. and Tres Bellotas (= 3 

 Emory daks), and. later, from La Osa to Tucson and back by way 

 of Labaree, Pozo Bueno, and Buenos Ayres. 



Station Xo. 44. — Tumacacori Mission, on the Santa Cruz River, 

 Pima County. Arizona: altitude about 1.000 meter- (3,281 feet). 



a In the canyons about Tres Bellotas some remarkably tine specimens of 

 Emory oak (Querent cmovyi) were seen. 



