New York Agricultural Experiment Station. 313 



apparent on most of the specimens. The scales continued to en- 

 large slowly in this way until November 9, when the insects 

 apparently ceased their activities and still remain dormant. 

 Nearly all of them reached the normal hibernating stage. 



The effect of this temperature upon the adult females was 

 shown by a number that were kept three months in this room 

 and then removed to the laboratory. Within two days after the 

 change some of them were producing young. 



Summary. — These results are interesting in showing that the 

 young larvae, although apparently unable to develop to the hiber- 

 nating stage in a temperature of 45° F. were still able to resist 

 this temperature for six weeks and when transferred to a room of 

 higher temperature to continue development to the normal hiber- 

 nating stage; also that the adult females may withstand it and 

 produce 3'oung soon after being removed to a higher temperature. 



Room 3. — Average temperature 58°F. Lot 1 consisted of ten 

 larvsB borne September 1 and transferred to one apple September 

 2 which was immediately placed in the cool room. The scales 

 were not again observed until September 29 when they could be 

 easily divided into three groups according to the external appear- 

 ance of the scale, as follows: Group 1, four larvse, scales light- 

 brown; Group 2, five larvse, scales dark gray approaching black, 

 with small white central tuft. Group 3, one larva, side black. 

 October 3, Group 1, light-brown, quite convex, with black addi- 

 tion to margin. Group 2 and 3, no change. October 5, Group 

 1 has passed first molt. The scales show characteristic light 

 central area with narrow black band at margin of the scale. 

 Group 2, no change. Group 3 has passed first molt. October 8, 

 Group 1, very dark brown, nearly black. Group 2, no change. 

 Group 3, black with dark brown nipple. From this time until 

 October 30, Group 1 showed steady growth, passing the second 

 molt and becoming full size about this date. Groups 2 and 3 

 showed no further change. 



Summary. — In this case the temperature of 58° F. was not 

 BufScient to materially check growth until the normal hibcruat- 



