The development of cowpea weevil, Callosobruchus maculatus (Fabricius) (Col., Bruchidae), and its parasitoid, Anisopteromalus calandrae (Howard) (Hym., Pteromalidae), under nine constant temperatures and the best linear and nonlinear models describing the temperature-development relationships of the host and its parasitoid were determined. The pre-imaginal developmental time decreased with increasing temperature from 15°C to 35°C for both species and sexes. Based on the best-fitted linear

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... the lower developmental threshold and the thermal constant were determined as 10.4°C and 526.3 degree-days for C. maculatus and 11.5°C and 263.2 degree-days for A. calandrae, respectively. Fifteen non-linear temperature-dependent models were examined to find the best model to describe the relationship between temperature and development rate of C. maculatus and A. calandrae. Among non-linear models, the Analytis model was the most efficient for the description of temperature-dependent development of C. maculatus and A. calandrae.