313 Report of the Department of Entomology of the 



covered with the white fluffy scale. September 14 no change 

 was apparent except with two larvse, one of which had pushed 

 the scale nearly off from the body^ while the scale of the other 

 had begun to turn light brown. September 22 the scales of two 

 larvse were somewhat more dense than the others but otherwise 

 there w^as no apparent change. From, this time on there were 

 no further signs of development and by December 20 they were 

 dead. 



•Lot 2. This lot consisted of 13 larvrs born October 5 and trans- 

 ferred, the following morning, to an apple which was at once 

 placed in Room 1. They settled down almost immediately. Octo- 

 ber 8 they were dormant and naked with the exception of two 

 which showed faint traces of cottony threads. One was sparsely 

 covered with them. Examinations were made every other day 

 but no further development was apparent. November 17 they 

 were carefully examined and found to be dead. 



Summarij. — The effect of an average temperature of 35^F. upon 

 the young larvfe is here indicated and definitely shown so far as 

 the larvae under observation were concerned. They settled down 

 almost immediately and attempted at once to cover themselves 

 with a scale. More than half succeeded in doing this, but all 

 perished before reaching the normal hibernating stage. 



Room 2. — Average temperature 45°F. Lot 1 consisting of 84 

 larvae born September 4 and transferred to apples the following 

 morning. 



September 6. All had settled, a few of the white fibres showing 

 in every case but one and this larva was naked. 



September 8. Nearly all showed the white central tuft. 



From this time on there was no further development until 

 October 24, when six infested apples (3G larvae) were transferred 

 to the insectary where the average temperature was T5°F. By 

 October 27 a slight indication of development was apparent. 

 October 30 the white fibres of the new addition to the scales were 



'This has been observed in the laboratory. It is done by a movement 

 of the posterior segments. 



