Peromyscus californicus insignis. Rhoads. Chemisal Mouse. Not common. None were taken in the valley and few in the canyons. 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.
Peromyscus eremicus fraterculus. Miller. Dulzura Mouse. Common in the brush land of both valley and foothill, being found in the canyons also.
Reithrodontomys megalotis longicauda. Baird. Long-tailed Harvest Mouse. Common in valley and foothill. Although partial to grassy areas (I took many in the grassy runways made by meadow mice—Microtus californicus). I found them not uncommon in the dry brush land east of Indian Hill.
Neotoma fuscipes macrotis. Thomas. Southern Brush Rat. Common from valley 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.
Neotoma intermedia intermedia. Rhoads. Intermediate Brush Rat. There 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 californicus californicus. (Peale.) California Meadow Mouse. Common in runways through the grass in damp canyons, at Palmers canyon and in other suitable localities. One was taken as high as Kelly’s cabin—on Ontario peak, among fallen logs by a cold mountain stream. While setting trap in the runways I more than once caught glimpses of them darting along the aisles in the grass.
Thomomys bottæ pallescens. Rhoads. Southern Pocket Gopher. Abundant in the valley, often doing much damage in lawns and orchards.
Perodipus agilis agilis. (Gambel.) Gambel Kangaroo Rats. Abundant from valley to Transition zone. I found them abundant at Brown’s Flats where the evidences of their digging and their holes are on every side. I have trapped them in brush country, rocky areas, open brushless places, and at the mouth of ground squirrel holes.
Lepus californicus. (Gray.) Jack-Rabbit. Common in the valley and to a certain extent in the foothills and higher.
Sylvilagus auduboni sanctidiegi. (Miller.) San Diego Cottontail. Abundant in the Lower Sonoran zone. Increasing each year due to the protection afforded by game laws. Considerable damage to young trees is done by cottontails and they are a great pest to the farmer.