1919.-] CONTROL OF THE CACAO THBIPS. 



SUMMARY OF LIFE HISTORY. 



8S 



Eggs are laid by the female (fig. 1) in the tissues of young leaves ,' 

 they hatch in about 3 to 4 days. In the case of cacao the female lays 

 also in the skhi of pods that are nearly mature. The young 

 larvffi (fig. 2) take about 9 days to complete their growth and then turn 

 into prepupa? (fig. 3), this stage lasts 24 hours and is followed by the 

 pupal stage (fig. 4) which is completed in 4S hours when adults appear. 



Fig. 2. 



Fig.3. 



Pg. 4-. 



Fig. 2.— Larval or young 

 stage of thrijjs. The natural 

 size i.s about the same as the 

 adult insect when the larva 

 is full grown. Greatly en- 

 larged. Colour light yellow, 

 dark bands shown on draw- 

 ing are red. Kedrawn from 

 Russell. 



Fig. 3.— Piepupalstago. 

 Greatly enlaiged. Colour 

 and size more or less like 

 larva with red bands. Ke- 

 drawn from Paissell. 



Fig. 4. — Pupal stage- 

 Greatly enlarged. Colour 

 and size more or less like 

 larva with red bands. Ke- 

 drawn from Russell. 



The total period of development amounts to 12 days from the hatching 

 of the egg to the appearance of perfect insects. The female lays- 

 eggs without pairing for several generations and males are not 

 common, occurring only at certain seasons and then not in large 

 numbers. The number of eggs a female can lay is estimated at 

 about 50. The length of the life of a female has not been determined 



