DEVELOPMENT OF PAKACOPIDOSOMOPSIS 5 



The time given above is for stages reared in the laboratory 

 during the months of October to December. Out in the field 

 in the sun development occurs much more rapidly. Under such 

 conditions, the entire hfe-cycle is completed in about thirty 

 days. There is also considerable variation in the rate of devel- 



First maturation 



Second maturation 



Pronuclei 



Fertilization 



First cleavage spindle 



2-celled stage 



Second cleavage spindle 



4-celled stage 



8-celled stage 



14-celled stage 



28-celled stage 



50 to 60 cells 



70 cells 



135 cells 



220 to 225 cells 



Young polygerm 



Completed polygerm 



Division of primary masses. . 

 Division of secondary masses 

 Division of tertiary masses... 

 Beginning of sexual embryos. 



Free larval stage 



Pupation 



Adult insects 



25 to 30 mins. 

 60 to 65 mins. 

 1 hr. 30 mins. 



1 hr. 50 mins. 



2 hrs. 30 mins. 



3 hrs. 



3 hrs. 30 mins. 



4 to 5 hrs. 



7 hrs. 



8 hrs. 



9 hrs. 

 19 hrs. 



26 hrs. 

 40 hrs. 



45 to 50 hrs. 

 70 to 72 hrs. 

 75 to SO hrs. 

 77 hrs. 

 4 to 7 days 

 7 to 10 days 

 14 to 15 days 

 22 to 27 days 

 28 days 

 47 days 



3, 34 



4 



6, 7 



8, 9, 36 

 11, 12 

 15 

 16 



17, 18 

 19 



20, 21 

 43. 44 

 45, 46 

 47 

 48 

 50 

 52, 54 



53 

 60 

 62 

 65 

 76-77 



55-60 



opment in different eggs, irrespective of temperature. In order 

 to avoid referring repeatedly to the age of different stages, I 

 have compiled in table 1 the average time for each of the more 

 important stages. The data are taken from material reared in 

 the laboratory and the time is determined from oviposition. 



