Life-history of the Stiek Insect, Carausins morosus. 293 



The boxes were kept in a room without artificial heating. 

 Durinj]! some periods of cold weather the temperatiare of 

 the room must have been below 40° F. 



Roth kept his insects in inverted glass bell-jars in a 

 room maintained at a certain temperature. It is certain 

 that the temperature inside his bell-jars was higher than 

 outside, but only the room temperature is given. 



The eggs for incubation were kept in ordinary chip 

 boxes in the room with the insects, and no moisture was 

 given them. 



3. Egg Development. 



An egg is deposited at intervals of from 4 to 6 hours, 

 but during an interval of 96 hours only from 8 to 10 are 

 deposited. There are intervals of 20 to 40 hours durijig 

 which none are laid, and it is during this time that others 

 are developed for deposition at further intervals of from 

 4 to 6 hours. It would appear that 8 to 10 eggs are 

 developed at one time though at different stages, so that 

 when one is laid another is beginning to form. 



During 96 hours there is altogether an interval of from 

 40 to 60 hours during which none are laid, and the longer 

 the interval the fewer are laid. However the interval of 

 rest may vary, the number of eggs laid is still one for 

 every period of 4 to 6 hours. 



In one case, duruig 96 hours 10 eggs were deposited 

 with a total rest interval of 42 hours. In another case, 

 dnring 96 hours 6 eggs were deposited with an interval of 

 56 hours. 



A lengthened period of rest does not result in the 

 development of more eggs. One egg in each ovarian tube 

 is ready almost at the same time, the succeeding egg being 

 far behind in development. As soon as these ripe eggs 

 have been discharged, the period of rest supervenes until 

 the next batch is ready. 



Eggs were mostly deposited between the hours of 6 p.iu. 

 and 10 a.m. 



Eggs are deposited at less frequent intervals from the 

 age of 320 to 400 days, and these intervals increase in 

 length until on the average half the number of eggs is 

 produced in the saij>e time. 



The egg is visible within the anal cavity several hours 

 before it is dropped. 



