304 



DR. II. GADUW OX EVOLUTION 



[Mar. 20, 



granules, another with very slight, almost imperceptible, and the 

 rest with intermediate enlargements. In the four Raleigh 

 specimens 2 or 3 rows of granules are slightly enlarged. In no 

 case are the enlarged rows directly continuous with the posterior 

 scales of the humerus. Anterior surface of forearm with 2, 2|, or 

 3 rows of plates. 



Femoral scales according to Cope in 6 rows, less frequently 

 in 7. I find 6 rows in the Raleigh specimens, three of the rows 

 reaching the knee. Two of the Sauz specimens have only 5 rows, 

 oi which two are very large and alone reach the knee ; another 

 specimen has 4 to 5 irregular rows, and another has only 4 rows, 

 of which the first is extremely broad. 



Tibia with 2^^ to 3 rows of plates. 



Femoral pores 14-19. Raleigh, 15/16, 17/17, 17/18, 18/18; 

 Sauz, 15/15, 15/16, 16/16, 18/17; Bloomington, Ind., 14/14 and 

 19; San Diego, 14/14 to 16. 



Coloration. — Under parts uniformly white with a mother-of- 

 pearl gloss, or blue-green tinge on the flanks. Above : ashy to 

 black-brown fields without any pale spots ; with three pairs of 

 white to yellow complete stripes, in addition to a dull-coloured 

 central streak. The latter vai'ies considerably. It is either a 

 faint line in the centre of the brown and broad mid-field 3-3, or 

 it forms a well-mai-ked streak, so that there are seven stripes in 

 all ; or, lastly, it is difierentiated into a pair of pale brown lines 

 which are separated by a dark brown central streak, so that there 

 ai-e 8 stripes in all, as, for instance, in the Raleigh specimens. 





Length. 



Collar. 



Forearm. 



Pores. 





(ram.) 









Raleigh, N.C. 



68 



Weak. 



3 rows of very 



17 j No field-spots. 



(Cambridge Museum). 







slightly en- 

 larged granules. 







!) » 



68 

 68 



Moderate. 



" 



17 



18 



" 



„ 



70 



Rather 

 strong. 



-•' " 



16/15 



» " 



Bloomington, 111 



69 



Weak, edge 



Enlarged gran- 



19! ; No field-spots whatever. 







partly 

 granular. 



ules and small 

 polygoues. 



i 



„ 



58 



" 



Somewhat en- 

 larged granules. 



14/14! 



" 



Pensacola, Fla. 



43 



^j 



„ „ 





No field-spots. 7 stripes. 



San Diego, Cal. (4) ... 



56-64 



Strong. 



3 with slightly 



enlarged 



granules. 

 1 with small 



polygenes. 



14/14! None with field-spots. 



to 



6 and 7 stripes, 3/3 either 



16/16 parallel, with a long 



faint central streak ; or 



enclosing an island as in 



some C. deppei with 









! more numerous stripes. 



The interesting question is whether C. gularis and 0. sexlineatus 

 merge into each other. According to Cope they do so in Texas, 



