Vol. xxvi] 



ENTOMOLOGICAL NEWS. 



217 



12,269 



When oviposition was completed the petri-dishes were sealed 

 with vaseline and placed in a fairly light part of the room but 

 out of all direct sunlight. 



The minimum and maximum daily temperatures were re- 

 corded. The lowest temperature at any time during the entire 

 period of incubation was 71 degrees F., the highest was 94 de- 

 grees F. The average minimum temperature during the incu- 

 bation was 74 degrees F., and the average highest was 89 

 degrees F. 



The shortest incubation period was twenty-five days, count- 

 ing from the time the first eggs of that batch was deposited 

 until the first larvae emerged from the same lot of eggs. 



The incubation period of eggs from each tick is shown : 



12 

 25 



Tick No. .1 2 3 4 5 6 7 8 91011 

 Days 27 27 27 25 27 27 26 26 26 25 25 



After a number of larvae had emerged, it was impossible to 

 keep accurate record of their emergence on account of young 

 larvae, empty egg shells, and unhatched eggs all being massed 

 together so closely that when they had apparently all emerged 

 there may have been a few remaining eggs with unemerged 

 larvae to escape notice, but as nearly as could be ascertained 

 it required about five days for all the larvae to leave the eggs 

 after emergence began. 



The eggs had been placed in the centers of the dishes before 

 sealing with vaseline and nearly all of the young larvae swarm- 

 ed on the sides and under surface of the covers of the dishes 



