HETEROMYIDiE 151 



cupant. One day in January I set a box trap near the burrow 

 and the next morning- found a Gambel Pocket-Rat in it. This 

 animal I kept alive in a box. The second evening following, 

 I found my dog playing with a young Pocket-Rat near the mouth 

 of the burrow. The next day 1 dug open the burrow to see 

 what its internal arrangement was. The burrow was oval in 

 section, the perpendicular diameter greatest, being a little more 

 than two inches. The entrance sloped gently downward, and the 

 main burrow was about eight inches below the surface for about 

 eight feet, then about a foot and a half below for six feet, where 

 it terminated in another entrance which I had not previously 

 noticed, as it was under a small perennial plant. This last en- 

 trance was nearly perpendicular for six or seven inches. There 

 were half a dozen branches to the burrow, varying from a few 

 inches to three feet in length, each terminating in a chamber of 

 greater diameter than the burrow. 



In one chamber was the nest, a mass of nearly a quart of 

 the hulls of grass seeds. The other chambers were used as gran- 

 aries. These contained acorns, seeds of poverty grass, and of 

 chrysanthemums and other flowers from a bed in front of the 

 house. Most of the granaries were closed with earth. The open 

 one was but part full and probably was the one from which food 

 was then being used. The various granaries contained respec- 

 tively 149, 27, 24, 131, 139 and 26 acorns. The weight of the 

 acorns and seed was forty two ounces; that of the adult female 

 was two and a quarter ounces. 



In the burrow, a foot or more from the nest was another 

 quite young Pocket-Rat. It seemed to very cold and hungry 

 and made a grating squeaking sound, which it kept up some 

 time after being put with its mother. I could not see that it 

 suckled, and think it did not, though it crept under its mother 

 and persisted in staying there. It ate shortly after being put 

 with its mother. 



The acorns in the granaries were brought from a tree stand- 

 ing more than a hundred feet from the burrow. On trial an 



