HIBERNATION, 



31 



localities. The rise of temperature after the cold weather does not affect 

 all species alike; one will emerge weeks before another. In rare cases 

 all of one species will emerge with extraordinary unanimity when the 

 temperature rises. It is not uncommon to find enormous numbers of one 

 species of a moth flying in one week, giving place next week to another 

 species which has emerged later. 



Hibernation is passed in all stages ; it is as yet impossible to give 

 accurate general statements, but one may say that many OrtJioptera 

 hibernate as eggs, as do one family of butterflies ; many Hymenoptera 

 and Coleoptera hibernate as imagines, others as pupae. Lepidopttra com- 

 monly hibernate as pupae or larvae, though some butterflies do so as eggs. 

 Diptera hibernate as pupae to some extent, Hemiptera as imagines or eggs. 



After the cold weather there usually follows a period of dry hot 

 weather prior to the rainy period. Little is known as to the manner in 

 which insects pass through this period. Many species that emerge from 



FIG. 42. 



Scale Insect on Tea. a, adult female scales ; b, male and female scales after first moult; 



c, female scales ; d, male scale ; e, winged male; f, antenna of male ; 



all enlarged except ja, and b t 



