1906.] IN MEXICAX LIZARDS. 373 



2 and 3 are still present, but grey ; fields still with double rows 

 of numerous spots ; throat mottled. 



Cope, who had many specimens from the Colorado River, adds 

 that the young have two pairs of narrow stripes, that the fields 

 between them show a row of pale spots, and that the thoi-ax is 

 not black. The adult he describes as having about 14 rows of 

 grey-yellow spots on grey-olive ground. 



In colovir and pattern of the upper parts, this species strikingly 

 resembles the C, sccdaris of the C. giolaris-gvon'p ; on the other 

 hand, the mottled throat of the Ft. Lowell female and the dorsal 

 striation show that C. melanostethus is a smaller and nigrescent 

 form closely allied to C tessellatics. 



Cnemidophorus martyris ^teineger = cethiops Cope. 



From San Mai'tyr Island in the Gulf of California, and from 

 Hermosillo in Sonora. Length 82 mm. 



Humerals 4-5 ; femorals 6-7 ; pores 20-2 L 



Immature, or females ? : with 7 narrow stripes, which are a 

 little paler than the ground-colour ; fields obscurely spotted, but 

 one of the females has the fields spotless and black ; under parts 

 white, throat and collar dusky. Old specimens are black above 

 and below, except the hind limbs and the ventral line of the tail. 

 The posterior side of the thighs is mai-ked with three black 

 longitudinal stripes. 



The following two species are based upon very insufiicient 

 material, possibly young specimens. 



They belong without any doubt to the tessellat^cs-grou^p. 



Cnemidophorus octolineatus Baird. 



The single specimen, from Pesqueria Grande in Nuevo Leon, 

 measures 60 mm. Bluish olive, darker above, lighter below ; 

 with 8 pale narrow sti'ipes of the same tint ; without any spots 

 on body, tail, or limbs. Humeral rows of scales 5, femorals 6, 

 tibials 3. Pores 17. Scales of the back depressed. 



Cnemidophorus inornatus Baird. 



Two specimens, from Pesqueria Grande, ISTuevo Leon, of 56 mm. 

 Uniform dark olivaceous above, pale olivaceous below ; without 

 spots or stripes. Scales of the back tubercular and elevated. 

 Humerus with 6 rows. Femur with only 4 or 5 rows according 

 to Cope, but I count 6 very regular rows in the figure on p. 591. 

 Pores 16-17. 



I am inclined to think that these are very young specimens. 

 Cope remarks that "it is the smallest species, and yet shows no 

 indication of stripes." However, in very young examples of 

 C. guttatus, the spotted and dull-coloured forest- variety of C. im- 

 mutabilisj the stripes are frequently at first so very faint that 

 they are visible only in certain lights, and they appear onl}^ later 

 as stripes, soon to be broken up and to pai^tly vanish again. 



25* 



