270 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, I37 



Japanese workers also suggest that the discrepancy in such imaginal 

 postemergence maturation times for these two species is related to the 

 solitary existence of the house fly which demands rapid completion of 

 development for survival ; the honey bee on the other hand appears to 

 have a somewhat retarded postemergence maturation of this function, 

 in accordance with its social habits and its confinement to the hive for 

 some days after its appearance as an adult. In Drosophila funehris 



dutch Ca akfiviert 

 dutch Mg akh'vierf 



12 3 5 7 10 15 20 



Tage fiach dem Ausschlupfen 



Fig. 3. — Activity of muscle ATPase in the adult worker honey bee. 

 (After Sakagami and Maruyama, 1956.) 



(Fabricius), Williams et al, (1943) reported that the body glycogen 

 more than doubled during the first 3 days and continued to rise to a 

 maximum by the sixth day, after which there was no change from 

 the maximum through the second week (see table 2). Figures 4 and 5 

 show that these changes in glycogen content followed in parallel 

 fashion the flies' flight ability (as it could be measured in terms of 

 wing-beat frequency or average duration of flight). In a histological- 

 histochemical study of the reserve substances of flight in Drosophila 

 sp., Wigglesworth (1949) observed that the larval fat body, rich in fat 

 and protein reserves, persists in the body of the emerged fly ; at the 



