PV?2P,. 



il 



Fig. 36. 

 Weevil, and the case from wl/ich it emer<jes. 



Fig. 37. 



The Flanlaiii Weevil, and the case of iwisled 



Jibres from n'/iich it emerf/es. 



but if we are to have clear 

 conceptions of insects' aeti- 

 vitiesj we must think of 

 each species as distinct, so 

 distinct that even we can 

 see the differences. 



Subject to this, we may 

 say that cold retards the 

 development and activities 

 of insects; even the cold of 

 the plains sends many in- 

 sects into a torpid condition, 

 this hibernation lasting for 

 periods that vary accord- 

 ing- to the lowness of the 

 temperature. Equally, lack of 

 food, dry air, and intense heat, 

 compel the majority of insects 

 to be dormant in some form for 

 some months of the year. This 

 is dealt with subsequently. The 

 periods of larval life may be a 

 few days as in many fly maggots, 

 a few weeks as in most moths, 

 beetles, etc., or a few or many 

 months, as in many beetles. The 

 Cicadas probably live far longer 

 as nymphs, one American species 

 living seventeen years under- 

 iiround before becoming an 



Pupal Life. 



The pupa being inactive and 

 helpless is usually concealed or 

 protected from enemies. In 

 Hymeiioptera it is commonly 

 encased in a silken covering, in 

 a cell, a nest, or in tlie ground. 

 In Coleoptera a silken cocoon is 

 never formed, thougli approaches 



