The brush rabbit is a Pacific Coastal species; as may be seen from figure 9 on the next page, this species occurs from the Columbia River on the north to the tip of Baja California on the south. Nowhere, so far as I can learn, does it occur as far east as the crest of the Cascade-Sierra Nevada Mountain Chain. Throughout its range the brush rabbit is closely associated with--in fact, lives in--the chaparral that is dense enough to afford protection from raptorial birds and the larger carnivorous mammals. The rabbit's reliance on protective cover is so great that, as pointed out on an earlier page, a person can turn this trait to advantage in protecting cultivated crops from inroads that the rabbits might make on them. The protection is afforded by clearing the brush from a strip forty-five feet wide so that the cleared strip intervenes between the cultivated crops and the brushy shelter. The rabbits will not risk crossing the open strip and hence do not reach the growing crops. [Illustration: FIG. 9. Distribution of _Sylvilagus bachmani_ and _Sylvilagus mansuetus_. 1. _S. b. ubericolor_ 2. _S. b. tehamae_ 3. _S. b. macrorhinus_ 4. _S. b. riparius_ 5. _S. b. mariposae_ 6. _S. b. bachmani_ 7. _S. b. virgulti_ 8. _S. b. cinerascens_ 9. _S. b. rosaphagus_ 10. _S. b. howelli_ 11. _S. b. exiguus_ 12. _S. b. peninsularis_ 13. _S. b. cerrosensis_ 14. _S. mansuetus_ ] Brush rabbits use simple "forms" in the brush for resting. Only one observer (Orr, 1940: 173) has reported an individual entering a hole. In patches of chaparral in which the rabbits live they make runways that are especially well defined at the edges of the brush. The outer entrance to a runway is tunnellike and one to two feet from the outer entrance there is a special form that serves as a lookout post. A brush rabbit that is about to venture into the open ordinarily pauses in such a form for several minutes, presumably to satisfy itself that no enemy is in the open area whither the rabbit is bound. The breeding season is from January to June, at least in California. There are 2 to 5 young, averaging 3.5 per litter. They are born in a nest. SYLVILAGUS BACHMANI BACHMANI (Waterhouse). 1839. _Lepus bachmani_ Waterhouse, Proc. Zool. Soc. London, Pt. 6 (for 1838):103, February 7, type from California, probably between Monterey and Santa Barbara. 1904. _Sylvilagus_ (_microlagus_) _bachmani_, Lyon, Smiths. Misc. Coll., 45:336, June 15. 1855. _Lepus trowbridgei_ Baird, Proc. Acad. Nat. Sci. Philadelphia, p. 333, type from Monterey County, California. _Marginal records._--California (Orr, 1940:150): 2 mi. S mouth Salinas River; near Morro. SYLVILAGUS BACHMANI CERROSENSIS (J. A. Allen). 1898. _Lepus cerrosensis_ J. A. Allen, Bull. Amer. Mus. Nat. Hist., 10:145, April 12, type from Cerros [=Cedros] Island, Baja California. Known from type locality only.