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CALIFORNIA ACADEMY OF SCIE^'CES [Proc. 4th Ser. 



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d-/ 



Figure 4 



Figure 4 represents the number of preocular plates. It 

 shows T. 0. biscutatus is entitled to recognition, and that 

 T. 0. hammondii also has a strong tendency toward an 

 increase in the number of these plates. The other subspecies 

 all agree in having but one preocular as the normal condition. 

 The percentages shown for the various subspecies are : — 



T. 0. ordinoides 87, 8, 5. 



T. 0. atratus 94, 2, 4, 0.3. 



T. 0. elegans (Sierra Nevada) 97, 0.3. 



T. 0. elegans (San Bernardino Mts.) 34, 12, 5. 



T. 0. vagrans77, 11, 11, 1. 



T. 0. biscutatus 23, 11, 66, 0.4. 



T. 0. hammondii 36, 18, 42, 1, 3. 



T. o. coiichii 85, 2.5, 12.5. 



