486 7. X AN TUSH DM 



Length to anus . . 57 63 65 



Length of tail 66 69 83 



Shielded part of head. 1 2J/2 14 13 



Snout to ear _ . 12 13 



Snout to anterior gular fold- 12 13 



Snout to posterior gular fold 20 21 



Fore limb _ 10 16 



Hind limb _ 26 27 



Base of fifth to end of fourth toe 9J^ 10 



Distribution. — Henshaw's Night Lizard was originally 

 found at Witch Creek, San Diego County, California. This 

 locality is in the chaparral belt, at an "altitude of 2,700 

 feet". I have since received specimens from Poway, San 

 Diego County. The specimen described by Prof. Cope as 

 X. -picta, said to have been collected in Tejon Pass, prob- 

 ably was collected at Poway. Stephens found this lizard 

 in La Puerta ^'alley, San Diego County. 



Habits. — This species lives among the granite boulders, 

 and comes out into the narrower crevices between them a 

 few minutes before dark. It is, therefore, practicable to 

 hunt for it only about 1 5 to 20 minutes each day. If a bit of 

 string or a straw be introduced into the domain of one of 

 these lizards it will often be seized, the reptile apparently 

 mistaking it for some stray insect. 



101. Xantusia riversiana Cope 



Island Night Lizard 



Plate 51 



Xantusia riversiana Cope, Proc. Acad. Nat. Sci. Phila., 1883, p. 29 

 (type locality, California); BouLENGER, Cat. Lizards Brit. Mus., 

 Vol. II, 1885, p. 328; Rivers, Am. Nat., XXIII, 1889, p. iico 

 (type locality stated as, San Nicolas Island); Cope, Proc. 

 LI. S. Nat. Mus., 1889, p. 147; Van Denburgh, Proc. Cal. Acad. 

 Sci., Ser. 2, Vol. 5, 1895, p. 533; Van Denburgh, Occas. Papers 

 Cal. Acad. Sci., V, 1897, p. 130, fig.; Cope, Report U. S. Nat. Mus. 



