Comparison of the Prepupal Diapause in Two Sibiling Megachilid Species, Megachile (Chelostomoda) spissula COCKERELL and Megachile (Chelostomoda) esakii YASUMATSU, Occurring in Different Climatic Zones (Hymenoptera, Megachilidae)

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In 2 sibling species ofmegachild bees, Megachile spissula and M esakii, the breaking of prepupal diapause was studied.Both species are univoltine.The former occurs in temperate zone and the latter in subtropical zone.The low temperatures of 14℃-18℃for 3 months was effective subjecting prepupae in M spissula to break diapause.In M esakii, similar low temperatures (15℃-18℃)and also a little higher low temperature (21℃)were effective but very sh01ier duration (about a month or less ) .The developmental threshold temperatures in both non-dormant prepupae and subsequent pupae were a little lower in M spissula than M esakii which were 0. 9℃in females and 2. 2℃ in males of prepupae, and 1. 9℃in females and 3. 1℃in males of pupae.These differences of thermal response between 2 species may have close relation with their distributional ranges.Megachile esakii seems to adapt inhabiting in the subtropical zone, where low temperatures are for sho1i period of time.

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