1912.] Townsend, Mammals from Lower California. 123 



well-beaten trails. Being nocturnal, we saw nothing of them, but the traps 

 yielded specimens both nights we were at the island. They did not appear 

 to be so common at other places visited by the ' Albatross '. 



Kangaroo Rats. 



Kangaroo rats are handsome animals with velvety fur, and derive their 

 name from the long hind legs and tail and the habit of leaping kangaroo 

 fashion. They have cheek pouches in which food is carried to their burrows. 



22. Dipodomys insularis Merriam. San Jose Island Kangaroo Rat. 

 Male, 2 females, San Jose Island, April 1. 



23. Dipodomys merriami Mearns. Tiburon Island Kangaroo Rat. 

 Seven males and 1 female, Tiburon Island, April 12-13. 



24. Dipodomys merriami simiolus Rhoads. Allied Kangaroo Rat. 

 Male, 3 females, San Francisquito Bay, April 10. 



25. Dipodomys merriami melanurus Merriam. Black-tailed 



Kangaroo Rat. 



Six specimens, Miraflores, April 25-May 2. 



Geomyiid^e. Pocket Gophers. 



These animals are active burrowers, living almost entirely under ground. 

 They are vegetable feeders and have cheek pouches in which to carry food. 



26. Thomomys bottse anitse Allen. Santa Anita Pocket Gopher. 

 Seven specimens, Miraflores, April 28-May 4. 



Murid.e. Wood Rats, Deer Mice, etc. 



Wood rats were obtained by night trapping at most of the localities 

 visited by the 'Albatross'. It is, by reason of its conspicuous brush nest, 

 more in evidence than any other mammal. Nests were seen by the dozen 

 in all sorts of locations, from the high, rocky ridges, down to the mangrove 

 belts along the lagoons. One nest high up on Margarita Island, was built 

 quite in the open against the side of a rock commanding an extensive view. 

 The broken twigs of which it was largely composed, were covered entirely 



