The two species of legume beetles, Callosobruchus maculatus F. Callosobruchus chinensis L.(Bruchidae: Coleoptera) are the most damaging pests on legume crops in Yemen. They cause tremendous losses reache more than 80%. This study was undertaken to determine the survival, and behavior of these two pests under temperatures 25c° and 30c° with constant humidity being 70%. The results revealed that increase in temperature shortens the period of oviposition for both species, whereas C. maculatus was more fertile in egg production compare to the other insect. Decline in temperature prolonged the life period on both insects. Investigation showed that pre-oviposition in both species were affected, under 30c° by less than one day, and under 25c° more than one day.
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