50 RESULTS FROM GIPSY MOTH PARASITE LABORATORY. 



was rather greater than the widtli of the plates themselves. Three 

 clays later the first ecdysis was completed and the second-stage larva 

 had moved some distance away from its original feeding ])lace. The 

 next day it had become very mnch distended and glistening. On 

 February 7 it liad apparently molted a second time and was very 

 strongly tuberculate. On the 9th it was again feeding freely. Five 

 days later it had reached full growth and ceased feeding. The next 

 day pupation had taken place, but the pupa was still pale in color and 

 covered with little "perspirationlike" globules. On the 19th the 

 thorax of the pupa had begun to turn dark and the sculpture of the 

 adult to show, and three days later it had become entirely dark 

 colored. On February 25 the adult Perilampus emerged. The timo 

 required for development from start of external feeding to maturity 

 was 28 days. The incubator was kept at a constant temperature of 

 78° F. 



In the unopened puparia brought in at the same time Perilampus 

 required about 25 days from the time they were placed in the incu- 

 bator until they emerged as adults, but the period of development is 

 dependent somewhat upon how much time they have been left out 

 of doors, and there is some variation among the individuals them- 

 selves. From puporia brought in and placed in the incubator 

 November 22 to 28 PerUampus began emerging December 27, about 

 a month later, and continued coming out intermittently until approxi- 

 mately February 13, covering a period of about 48 days. Puparia 

 brought in December 13 to 19 produced Perilampus first on January 

 17 and continued producing until February 6, a period of about 

 20 days. Puparia brought in January 17 to 23 produced adult 

 Perilampus first on February 14 and continued until March 3, a 

 period of about 17 days. From the above data it is seen that tlie 

 later in the winter the puparia are brought in and placed under con- 

 ditions favorable for the development of Perilampus, the shorter is 

 the period during which the adults emerge. It is also evident that 

 when infested pujmria are brought in early in the winter a longer 

 period of time elapses until the first adult Perilampus emerges than 

 when left for a more extended period out of doors. Whether bringing 

 the planidium in later in the winter causes it to develop more rapidly 

 or whether it simply does not require so much time before becoming 

 ready to begin feeding under these conditions is not known, but the 

 latter explanation seems more reasonable. 



The relative time of emergence of the adult Perilampus and adults 

 of the host insect of the same lot is of considerable interest and will 

 be given more study later. In September, 1V)()8, a lot of VarichEeta 

 were placed in cold storage and kept there until January 18, when 

 they were brought into the laboratory. From these puparia Vari- 



