680 PROCEEUIXGS OF THE ACADEMY OF [Sept., 



nightly sang and yelled us to sleep in the Colorado delta. They were 

 overabundant and easily trapped." 



Tursiops gillii Dall. Gill's Dolphin. 



Une skull, found on the Hard}' river at the base of the Cocopah 

 Mountains, fifty miles above the Gulf. 



Additional Species Observed. 



Odocoileus hemionus eremicus (Mearns). Sonoran Mule Deer. Burro Deer. 



"It was probably this race which we found inhabiting the delta on 

 tlie Californian side. The floods had driven them to the uplands, so 

 they were rarely seen, but their old tracks were abundant. Two speci- 

 mens were shot by a comrade near the last camp, the horns of which 

 were taken home by Mr. Wilder. On the delta this species ruts in Feb- 

 ruary, the fawns being born in August." 

 Antiiocapra americana mexicana Merr. Mexican Antelope. 



"A trip was taken to the base of the mountains, nine miles from 

 Bruce's ranch, for this species, but none were seen. Their old tracks 

 were plentiful. About forty miles south of this point, on the mesas 

 of the San Pedro Martir and ]\Iajor Cocopahs, they are reported to be 

 abundant." 



Castor canadensis frondator Mearns. Arizona Beaver. 



"Several are trapped in winter on the lower Colorado. I examined 

 some fresh hides in a trapper's camp above the Colony, and a large 

 number taken on Pescadoro Slough, where they are reported more 

 abundant. They make no dams nor aii}^ homes in the banks, but raise 

 large flat piles of brush and mud for their homes back in the densely 

 grown sloughs and ponds of the bottoms." 



Felis cougar browni (Merr.). Sonoran Puma? 



"None seen. Our guide, Frank Tejano, denied having met with 

 this species, but had seen their tracks. He seemed to be in awe of 

 them and declined to give his experiences. They are rare." 

 Lynx ruffus peninsularis Thomas. Peninsular Wild Cat? 



"One or two seen. Not rare." 



Taxidea taxus infusca Thomas 1 Badger. 



"Tracks of badgers were seen, as well as holes stated to l)elong to 

 them." 



Thomomys fulvus nigricans Rhoads? Lower Sonoran Mole Rat. 



"A few places indicated the presence of some species of this genus 

 even in the bottom lands. None were captured." 



