226 TJnivcrsiiy of California Publications in Zoology. [Vol. 7 



Great Basin. A few were seen at Winnemncca and at Amos. A 

 number were observed between the latter station and Willow 

 Point. They were almost omnipresent in the mountains, where 

 they seemed to be much more common than on the desert proper. 

 There was a belt from about 5000 feet in elevation up to 6000 

 feet in which chipmunks were rare. The range of Enfaniias 

 pictus by life-zones is, then, from Upper Sonoran up through 

 Transition to Canadian, if any of the latter is represented on 

 the Pine Forest Range. 



Habits. — Of the seventy-five specimens taken fifty are 

 females; thirteen of the twenty-two prepared examples from 

 Quinn River Crossing are fully adult ; of the series of forty-three 

 specimens from other localities at greater altitudes twenty-two 

 adults are at hand. Evidently our work was carried on during 

 the suckling period. IMost of the females had the mammary 

 glands active ; in many of the males the testes were enlarged. 

 There are four pairs of mammae, one pectoral and three abdom- 

 inal. None of the females secured contained embryos, which fact, 

 together with the large number of young secured, indicates that 

 the young are born during the early part of May or the latter 

 part of April. 



At Quinn River Crossing the chipmunks, although quite com- 

 monly trapped, were rarely seen. Their small size, silence, and 

 extreme shyness were characteristic. When surprised they fled 

 rapidly to their burrows with excited "chips." On May 25 two 

 were seen playing in and under a good-sized sagebush (Artemisia 

 tridcntata) near our Quinn River camp. They moved about very 

 rapidly and gracefully, and chased each other as if enjoying it 

 immensely, although uttering no sound. When they ran, their 

 tails were held high in air. Once or twice we heard them chat- 

 ter, but not until we got into the mountains were their call-notes 

 commonly heard. They were found indiscriminately on the open 

 desert and near the stream, and seemed to be perfectly at home 

 in the sagebrush. One was observed sitting on its haunches in 

 a sagebush and chattering. 



Chipmunks were universally present in the mountains, being 

 fcmnd in all sorts of situations, namely cm the sage flats and sage 

 slopes, on recumbent logs, occasionally in white-bark pines (Pi mis 



