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DR. H. GADOW ON 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 iio 

 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, 

 of 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 por^s 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 varies considerably. It is either a 

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

 it forms a well-marked 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 

 are 8 stripes in all, as, for instance, in the Raleigh specimens. 



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

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



