The fecundity, longevity, and daily ovipositional rate ofBathyplectes curculionis(Thomson), an endoparasite of larvae of the alfalfa weevil,Hypera postica(Gyllenhal), were determined at constant 21.1°C and fluctuating 6.7°/18.3° temperatures, while a 12:12-h photophase:scotophase was maintained under both regimes. The daily ovipositional rate was higher, but the longevity significantly lower (P0.10) between the 2 temperature regimes. Under both temperature regimes, the distribution pattern of the parasite eggs among the host larvae conformed to the Poisson, or random, distribution in ca. 90% of the 182 data sets examined. These and other characteristics ofB. curculionisare discussed and compared with those ofB. anurus.