130 CALIFORNIA ACADEMY OF SCIENCES. 



Length to anus 57 63 65 



Length of tail 66 69 83 



Shielded part of head 12| 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 9| 10 



Distribution. Henshaw's Night Lizard has been found 

 at Witch Creek, San Diego County, California. This 

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

 2,700 feet." The specimen described by Prof. Cope as 

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

 but this locality needs confirmation. 



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 fifteen or twenty minutes each 

 day. If a bit of string or straw be introduced into the 

 domain of one of these lizards it will often be seized, 

 the reptile apparently mistaking it for some stray in- 

 sect. 



37. Xantusia riversiana Cope. ISLAND NIGHT LIZARD. 



Xantusia riversiana, COPE, Proc. Ac. Nat. Sci. Phila., 1883, p. 29 

 (type locality California); RIVERS, Am. Nat. XXIII, 1889, p. 

 1100 (type locality stated as San Nicolas Island); COPE, Proc. 

 U. S. Nat. Mus., 1889, p. 147. 



Description. Limbs very short and body somewhat 

 depressed. Upper surface of head very flat. Nostril 

 pierced in a small scute at junction of rostral, internasal, 

 postnasal, and first labial plates. Rostral broad and 

 rather low, bounded by first labial, nasal, and internasal 

 plates. Two internasals followed by a large hexagonal 

 frontonasal. Behind this two prefrontals, bordered 

 posteriorly by broad frontal and first superciliary and 



