196 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



EXPLANATION OF PLATE VIII 



Chart of the counts of scales around the middle of the body in Tropi- 

 Each dot represents the count on one specimen. In the counts 

 from each island, or locality, the males are represented on the upper line, 

 the females on the lower line. The crosses represent the extreme counts 

 given by previous authors. 



