SI2E. 



35 



It is not Tiiireasonable to suppose tliat a smaller insect requiring" less 

 food and able to live long- periods on little nourishment thrives where a 

 larg-er insect could not. Probably it can reproduce more rapidly, it 

 offers less inducement to enemieS; and on the whole may be more suc- 

 cessful. These considerations probably determine the limit of size and 



Fia. 43. 

 Tlie Oleander HatoTc Moth : one of the siviftest-fijing of the large moths of India. 



the average is far lower than is generally supposed. Large insects are 

 rarely so injurious or plentiful as small ones. Locusts of course are an 

 exception. The very large ones cannot perhaps multiply sufficiently fast, 



Fig. 44, 

 The Hed Borer of Coffee : caler]}illar; pu]pa> as it wriggles out of the hi anch ; moth. 



d2 



X 



€.u.^ lyoc. C(>//k ct-e. 



