528 CALIFORNIA ACADEMY OF SCIENCES. 



times each day. At night, when they were always more 

 active, they often climbed to the top of a piece of yucca 

 stem placed upright in the middle of their cage. No de- 

 sire to burrow was observed. All declined to show any 

 interest in the small beetles and flies, both dead and liv- 

 ing, which were placed in the jar, and finally became 

 greatly emaciated. They were chloroformed in March, 

 1894. 



Mojave, Cal., Sept. 17-18, 1894. As it was not prac- 

 ticable to learn by actual investigation whether or not 

 JT. vigilis hid, during the day, among the thick-growing 

 leaves of the living yuccas, the localities examined in 

 1893, still clearly marked by the displaced rubbish, were 

 again searched with great care. The fact that very few 

 specimens were now secured in this previously-worked 

 area while the species was very common just outside its 

 limits, is evidence that the specimens found on the ground 

 under the dead branches were in their true diurnal home, 

 and not mere stragglers from the living yuccas. 



The specimens were all caught alive and put into a 

 large glass bottle, but were soon killed by the heat, al- 

 though care was taken to keep them in the shade as much 

 as possible. Count was kept as the lizards were put in 

 the bottle, and showed later that several more were taken 

 out than had been put in. This may have been due to a 

 mistake in the record, but was more probably caused by 

 the birth of young after capture. The adults were after- 

 wards carefully examined and three were found to contain 

 young, showing that the species is ovoviparous. One of 

 the three contains fwo fetuses, the others have one each. 

 These fetal specimens are about the size of the young 

 found under the dead branches. 



Hesperia, Cal., Sept. 26, 1894. Xantusias were very 

 abundant. Young were as numerous as at Mojave, Sept. 



