1913] Grinm ll-Swarth : Birds and Mammals of San -Jacinto 199 



Practically all the drainage on the western side of the San 

 Jacintos goes into the canon formed by the San Jacinto River. 

 From Hemet Lake down, this stream occupies a rough, narrow 

 and rather steep canon ; above the lake there is no running 

 stream, and the canon opens out into the broad, level Ilemet 

 Valley, extending nearly to Vandeventer Flat. On the east side 

 of the range is I 'aim Canon extending along almost the entire 

 desert base of the mountains and emptying onto the Colorado 

 Desert near Palm Springs; at the south it heads just below 

 Vandeventer Flat. The latter point is thus at one apex of a 

 rudely defined triangle, the three sides of which are formed by 

 San Jacinto River Canon, Palm Canon, and San Gorgonio Pass. 

 The main mass of the San Jacinto Mountains, including all the 

 higher parts of the range, is contained within this triangle. 



In the course of our season's work practically the entire 

 outline of this triangular area was traversed, and many collect- 

 ing stations were established within its borders. Some work was 

 done also at points outside the triangle, for example, in the Santa 

 Rosa Mountains. 



During the summer of 1908 two parties engaged in the field 

 exploration here concerned. The two authors of the present paper 

 entered the region from the west, and began work on the Pacific 

 side of the mountain. Our stations were as follows: 



Hemet, May 18 Tahquitz Valley, July 19 to 



Kenworthy, May 19 to May 25, August 5 



June 2 to June 11 Hemet Lake, August 6 to August 



Dos Palmos Spring. May 25 to 16 



June 2 Thomas Mountain, August 16 to 



Palm Canon, June 11 to June IS August 20 



Carrizo Creek, June 18 to June 23 Carrizo Creek, August 22 to 



Garnet Queen Mine, June 25 to August 27 



June 28 Vallevista, August 29 to Septem- 



Santa Eosa Peak, June 28 to July 1 ber 5 

 Strawberry Valley. July 3 to July 



19 



Only the junior author remained in the field until the last 

 indicated date. The senior author left July 31 ; and Harry E. 

 Wilder, of Riverside, took his place August 15. During the last 

 visit to Carrizo Creek, the party was further augmented by 



