Lilia Alcaraz-MelendezCentro de Investigaciones Biologicas de Baja California, Apdo. Postal 128, La Paz, B.C.S. 23000 México
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Bernardo Ayala-RochaCentro de Investigaciones Biologicas de Baja California, Apdo. Postal 128, La Paz, B.C.S. 23000 México
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Received for publication Jan. 18, 1982.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
The authors wish to thank Felix Cordoba for his keen interest and encouragement. We are also grateful to Samuel Rueda for his statistical assistance and to Dia Herman Romero and Enrique Cordoba for their valuable aid in translating this manuscript.