After the eonymphal moulting a decrease of respiratory metabolism has 

 been observed in all species studied reaching its minimal rate chiefly in the 

 eonymphal stage (Fig. 1). Both in diapause and nondiapause development 

 the period of eonymph represents the lowest metabolic rate of the whole 

 developmental cycle in most of sawflies. A progressive increase of metabolic 

 activity reappears at the beginning of mesonymph in connection with the 



700 



500. 



Л0О 



300 



200. 



100 



O2 consumption in mmj/grarry^ioui 

 cytochrome oxidase in mmj/grarrylO min 



succinic dehydrogenase in ^g formazary^ram 



V. 



4 5 6 7 



days after the last larval moulting 



Fig. 2. Oxygen consumption, cytochrome oxidase and succinic dehydrogenase activity 

 in the beginning period of the eonymphal stage in Neodiprion sertifer. Geof f r. 



onset of morphogenetical processes going on up to the i:»upal stage; if the pro- 

 nymphal diapause does not take place. The pupation brings forth an intensive 

 rise of respiratory metabolism lasting to the emergence of imago. A short 

 interruption of such an increasing course appears sometimes at the beginning 

 of the pupal stage as a result of finished moulting process. As shown in Fig. 1 

 the regular U-shaped curve of respiratory metabolism relating exclusively 

 to the pupae of various holometabola is divided in sawflies into the stages 

 of eonymph, mesonymph, pronymph and pupa altogether. As for the respira- 

 tory metabolism sawfly pupa corresponds only with the final ascending part 

 of the tj'^pical U -сигл'е of other holometabola. (Slama, 1958). 



Further experiments have shoAvn that changes in respiratory metabohsm 

 during the metamorphosis in sawflies are in close relation with changes in the 

 activity of some respiratory enzymes. Simultaneously with the rapid decrease 



197 



