PROC. CAL. ACAD. SCI., 4th Series, Vol. X 



[VAN DENBURGH] Plate 3 



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Figure 1. — Crotalus lucasciisis \'an Denburgh. Photograph of section of 

 skin of specimen from San Jose del Cabo, Lower California. Mexico. 



Figure 2. — Crotalus alrox Baird & Girard. Photograph of section of 

 skin of specimen from Tucson, Pima County, Arizona. 



