Heavy metal poisoning is treated often with antidotes which detoxify through the mechanism of chelation and revert the toxic effects. Dimercaprol (2,3-dimercapto propanol, British anti lewisiteBAL) is an antidote used to treat mercury and lead poisoning. Studies on detoxifying effects of dimercaprol when pregnant females are subjected to heavy metal poisoning in non-Mammalian subjects are totally lacking. The scorpion Heterometrous fulvipes provides an ideal non- mammalian viviparous system ideally suited for any studies aimed at comprehending the effects of maternal exposure to toxicants on development of young ones. Hence an attempt is made here to study the effects of the heavy metals, mercury and lead an the maternal animal and the developing embryos of H.fulvipes. Influence of dimercaprol on the effects of mercury and lead on the selected enzymes SDH and GDH of the maternal and embryonic tissues of H.fulvipes.