Occasional Papers of the Museum of Zoology 25 



Avere all pregnant on July 26, and on x\ugust 7 and 8 the young 

 were found in numbers, and all of the adult females taken had 

 given birth to their young. 



Cnemidop horns tigris (Baird and Girard). 



One hundred and twenty-two specimens collected between 

 the lower part of the valley of Annie' Creek and the Cortez 

 Range. 



The material needs little description, for while the varia- 

 tions are extensive they are mostly within the known Hmits for 

 the species. The stripes are easily distinguished in every speci- 

 men. They are particularly distinct anteriorly where they in 

 no specimen encroach upon the black midfields sufficiently to 

 lose their identity. Posteriorly, in old specimens, the pale color 

 of the stripes usually encroaches upon the black ground color 

 sufficiently to break up the latter into spots, and in the largest 

 individuals partly crowd out the spots, so that the posterior 

 part of the body tends to become unicolored, but this tendency 

 does not in our material go so far as to cause the stripes to 

 disappear. The markings on the ventral surface also vary con- 

 siderably. The dark blotches are usually black, but occasion- 

 ally dark slate, and are principally on the chin, throat and an- 

 terior part of the abdomen. However, the posterior part of 

 the abdomen is also more or less spotted, occasionally nearly 

 as much as anteriorly. The spots on the gular region are 

 obscure in the smallest specimens (60-63 ^^- from snout to 

 vent) although distinct on the belly, and in the larger in- 

 dividuals they are fewer in number but larger than those on 

 the belly. In 114 specimens the femoral pores vary from 16 

 to 23 with an average number of 19.24. 



With the exception of two specimens, this lizard was only 

 found on the flat north of the Humboldt Valley, between the 

 east side of the valley of Annie Creek and the Cortez Range. 



