214 



CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



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Figure 6 



Figure 6 represents the variation in the number of gas- 

 trosteges, in males only. It shows that T. o. atratus differs 

 from both T. o. ordinoides and T. o. elegans. All of the other 

 races agree closely with T. o. elegans in the number of their 

 gastrosteges. T. o. ordinoides is very distinct from all except 

 the intermediate T. o. atratus. 



