Notes on Insect Bionomics. 359 



Lot 3 — Fed one-half (approx.) of optimum of food; 4 deaths 

 before maturity; produced 10 males , 6 females. 



Lot 4 — Fed living minimum of food; 3 deaths before maturity; 

 produced 10 males, 7 females. 



Lot 5 — Fed living minimum of food; 6 deaths; produced 9 

 males, 5 females. 



Four lots of twenty larvae each reared in 1902 may be referred 

 to.^ These larvae were the offspring of parents of the variously 

 fed 1 90 1 lots, and the character of the food supply of the parents 

 is indicated as well as that of the larvae themselves. 



Lot I — Fed optimum; born of optimum food parents; no 

 deaths before maturity; produced 12 males, 9 females (21 indi- 

 viduals in this lot by mistake) . 



Lot 2 — Fed minimum food; born of optimum food parents; 7 

 deaths before maturity; produced 8 males, 5 females. 



Lot 3 — Fed optimum food; born of minimum food parents; 1 1 

 deaths before maturity; produced 6 males, 3 females. 



Lot 4 — Fed minimum food; born of minimum food parents; 3 

 deaths before maturity; produced 11 males; 6 females. 



The records of eight lots of twenty-five larvae each reared in 

 1903 may be referred to. The food supply condition of the par- 

 ents and grandparents, as well as of the 1903 progeny, are given. 

 ("O" indicates optimum food, "M" indicates minimum food). 



Deaths 

 Lots Fed Parents Grand- before Males Females 



parents maturity produced produced 



I O O O 2 13 10 



2 M O O • 2 14 9 



3 O M O 3 8 14 



4 M M O 6 8 II 



5 O O M o 15 10 



6 M O M o II 14 



7 O M M 20 2 3 



8 M M M 2 1 - 2 2 



^Because of backward season all 1902 larva; were fed for their first 20 days 

 (=:rabont one-third of whole larval life) on food of a poor quality, namely, 

 lettuce and mulberrv buds. 



