August, '16] PEXXIXGTOX: RHOGAS TERMIXALIS 405 



this female oviposited in a host larva on December 10, the piiparium 

 being formed on December 31, the adult male emerging on January 14, 

 1915. On December 4, after a male had been placed with this female, 

 but no copulation observed, although the pair was carefully watched, 

 the female oviposited in a larva. The larva was removed to its private 

 cage and the offspring appeared and formed puparium on December 

 24. The adult emerged on January 9 and was a female. 



From "Rhogas 4" were reared five males parthenogenetically. 



From "Rhogas 5" were reared five males parthenogenetically. 



From "Rhogas 6" were reared four males and one female. Two of 

 these males were reared from eggs deposited in larvae before placing 

 "Rhogas 6" with a male. After introducing a male into the cage, and 

 noting copulation, this female deposited eggs which resulted in the 

 production of one female and two males. 



From "Rhogas 8," unmated, was reared one male parthenogenet- 

 ically. 



From "Rhogas 10," unmated, was reared one male parthenogenet- 

 ically. 



From ''Rhogas 11," unmated, were reared two males partheno- 

 genetically. 



From "Rhogas 12," unmated, were reared two males partheno- 

 genetically. 



A total of 27 successful ovipositions occurred under artificial condi- 

 tions. 



The earlier stages of these for both males and females are similar 

 in duration. The egg and larval period, up to time of formation of 

 the puparium, for both sexes averages 19.1 days. The puparium 

 stage averages 16.7 days, while the length of life of the adult parasites, 

 under artificial conditions, varied remarkably between the two sexes. 

 Males lived on an average 16.5 days, while the females averaged 32.5 

 days, the longest lived female surviving 75 days; the longest lived 

 male, 35 days. 



Temperature plaj^ed an important part in the development and 

 emergence of adults after the puparium had been formed. A cool 

 period of a few days continuation would apparently interfere with the 

 normal activities and the adult would be delayed in emerging. 



It is interesting to note the sex of the offspring of parthenogenetic 

 females as compared to that of offspring of normally mated females. 

 Only males were produced from eggs deposited parthenogenetically. 

 The one apparent exception in the case of ''Rhogas 3" being doubtful 

 as to whether or not copulation took place between the female parent 

 and the male to which she was exposed. From mated females, off- 

 spring of both sexes were produced. The rule that females alone are 



2 



