Pomona College, Claremont, California 103 



Peromysciis boylei rozvlcyi. (Allen.) Rowley White-footed 

 Mouse. No specimens were trapped in the valley. However these 

 mice were found not uncommon at the mouth of Palmers canyon, 

 just four miles north of Claremont, in the dry brush land. Within 

 the canyon they were common and were taken as high as the top 

 of Ontario peak along fallen logs. At Camp Baldy they are very 

 common especially along water courses and fallen logs. Indica- 

 tions are that they ignore zonal limits being taken well down in 

 Lower Sonoran zone and in high transition and not necessarily 

 near water. 



Peraniysciis ciilij oni'niis insii/nis. Rhoads. Chemisal Mouse. 

 Not common. None were taken in the valley and few in the can- 

 yons. They were not found along waterways but frequently brushy 

 hillsides. This is a large species of mouse and was almost too much 

 for the little "gee whiz" traps to hold. 



Pi'ioiiiysciis ere»iiciis fralcrcitlus. Miller. Dulzura Mouse. 

 Common in the brush land of both \alley and foothill, being found 

 in the canyons also. 



RcithrodontomM mcyulolis loiuiicauda. Baird. Long-tailed 

 Harvest Mouse. Common in valley and foothill. Although par- 

 tial to grassy areas ( I took many in the grassy runways made by 

 meadow mice — Microtus californicus). I found them not uncom- 

 mon in the dry brush land east of Indian Hill. 



Neotouui fiiscipt's inturolis. Thomas. Southern Brush Rat. 

 Common from \alley to 5,000 feet in the mountains in suitable 

 localities. I took one in the property house at the Greek theatre 

 this June. The large nests are seen very commonly in the canyons 

 and hillsides. 



Neotouui intermedia inlenuedia. Rhoads. Intermediate Brush 

 Rat. These seems to be a curious reversal of conditions between 

 this and the former species. Whereas this species is supposed to 

 be taken only up to 3,000 feet, I took none below 3,000, all being 

 taken at 5,000 feet or more along fallen logs near watercourses, 

 and the former species was limited more distinctly to the foothills 

 which is not a typical condition. 



Microtus califoniiens ailifoniietis. (Peale.) California 

 Meadow Mouse. Common in runways through the grass in damp 



