j8 The West American Scientist. 



21. Ochetodon longicauda. Long-tailed Harvest Mouse. 

 Found in the same localities as the Meadow Mouse. Builds a 

 spherical nest in grass, sometimes a foot or more from the ground. 



22. Neotoma floridana. Wood Rat. Generally distrib- 

 uted in the northwest part of the county. 



23. Neotoma floridana mexicana. Mexican Wood Rat. 

 Colorado Desert. 



24. Neotoma fuscipes. Dusk-footed Wood Rat. Common 

 in the southern part of the county. These Wood Rats pile large 

 quantities of sticks in brush, and even in trees that slope a little so 

 that they can climb them. Their burrows are under these 'nests.' 

 These Wood Rats are sometimes a nuisance about camp, as they 

 will carry off anything they can lift. 



25. Thomomys talpoides bulbivorus. Pacific Pocket Go- 

 pher. 



26. T. talpoides umbrinus. Southern Pocket Gopher. 

 Abundant everywhere. These two varieties run together here, 

 so that is difficult to assign an individual to either variety. 



27. T. perpallidus. Pale Pocket Gopher. Mojave and 

 Colorado Deserts. Common in few places. 



28. Perognathus longimembris. Little Pocket Mouse. 

 Irregularly distributed. At times abundant in the larger valleys. 



29. Perognathus fallax. Gray Pocket Mouse. Mountain 

 region. Not common. I have a pet of this species that has 

 drank no water in the six months or more it has been in my pos- 

 session. It will not touch it, and does not seem to know what 

 water is. What is more inexplicable to me, is that it will not eat 

 green food when offered it. Mr. W. G. Wright has one of the 

 next species which is in fine condition, that has had no drink and 

 no food save drv grain for over two years Both these animals 

 are kept in boxes, where they possibly cannot get water from any 

 source except in the food given them. Many other species of an- 

 imals do not drink for long periods, but such animals eat moist 

 food. 



30. Perognathus pencillatus. Tuft-tailed Pocket Mouse. 

 Common in a few places in the Colorado Desert. Probably two 

 more of the genus occur on the Colorado River. 



31. Dipodomys phillipsi. Phillips' Pocket Rat. Colorado 

 Desert. Not common. 



32. Dipodomys agilis. Pocket Rat. ' Kangaroo Rat.' 

 Abundant in the coast region. 



33. Dipodomys deserti. Desert Pocket Rat Mojave and 

 Colorado deserts, 



34. Lepus sylvaticus auduboni. Audubon's Hare. ' Cot- 

 tontail.' Abundant. 



35. Lepus trowbridgei. Trowbridge's Hare. ' Bush Rab- 

 bit.' Rather common in the mountains in thick brush. 



36. Lepus californicus. California Hare. ' Jack Rabbit.' 

 Common in open ground. (The only true Rabbit we have is the 

 domesticated English Rabbit.) 



