DEVELOPMENT OF BROWN BUG 



59 



of life of individual bugs has not been determined as it is 

 impossible to say when they die. The total number of days 

 from the time of hatching to the time when young come 

 out, varies from 70 to about 83 days. The number of days 

 during which young continue to come out from under the 

 mother has been found to be about 16 in the case of a 

 large bug which laid 684 eggs. 



The following is the record of emergence from under 

 a female brown bug in the insectary: — 



1st day 78 



2nd „ U 



3rd „ 31 



4th „ 58 



5th day 28 



6th „ 42 



7th „ 57 



8th „ 39 



9th day 56 



10th „ 59 



11th „ 62 



12th „ 64 



13th day 21 



14th „ 38 



• 15th „ 9 



16th „ 10 



The eggs are of a pale pink colour. The young nymphs 

 when hatched are also pink in colour but of a deeper shade. 

 After the first moult they turn yellow. In the subsequent 



Text-Figure 16. 



Hymenopterous parasite of brown bug. 



instars there is a considerable variation. Some remain 

 yellow until the adult stage is reached when the upper 

 surface becomes marbled with black preparatory to chang- 

 ing to brown. Other nymphs are either crimson all over 

 or have three or four more or less conspicuous broad crim- 

 son bands on a yellow ground colour. The uniformly 

 crimson colour does not appear to be formed by the exten- 

 sion of the bands found in the banded forms. The bands 

 may be narrow or broad, light or deep coloured and there 

 may be no more than faint traces of them. In the later 

 stages of the growth, these bands, instead of intensifying 

 and running into one another, appear to become diffuse and 

 faint. The marbling with black appears to arise in these 



