Table 1. — Length of Egg-Stage of Lace-Bug. 



The young nymphs are quite active at first but soon settle down 

 to a quiet existence, feeding together in large colonies on the under- 

 sides of the leaves. Occasionally a few may be seen feeding on the 

 upper surface of the leaves and when feeding on the weed Solamim 

 torvilm they feed as much on the upper as on the lower surface of 

 the leaves. The nj'^mphs develop quite rapidly, passing through 

 five successive moults before attaining adult form. The period between 

 moults is remarkably constant being in practically all eases of two 

 days duration. The following table is a record of the moulting pe- 

 riods of some of the individuals reared in the laboratory : 



No. 



Table 2. — The Moulting Stage of Nymphs of Lace-Bug. 



Date 

 hatched 



First 

 moult 



Julv 23 .... July 25. 



Julv 23 ! July 2.T. 



July 23 1 July 25. 



Aug. 2 I Aug. 4.. 



Aug. 2 I Aug. 4.. 



Aug. 5 Aug. 



Oct. 4.... 

 Oct. 4.... 



.Second 

 moult 



July 27. 

 July 28. 

 Julv 27. 

 Aug. 6.. 

 Aug. 5.. 

 Aug. 9. 



Oct.5 1 Oct. 7. 



Oct. 6 ; Oct. 8. 



Third 

 moull 



Fourth 

 moult 



Julv 28 

 Julv 30 

 July 29 

 Aug. 8 

 Aug. 7 

 Aug. 11 

 Oct. 9. 

 Oct. 10. 



Fifth 

 moult 



July 30 ' Aug. 1. 



Aug. 1 ' Aug. 3. 



July 31 ' Aug. 2. 



Aug. 9 Aug. 11. 



Aug. 9 Aug. 11. 



Aug. 13 Aug. 15. 



Oct. 11. 

 Oct. 12. 



Oct. 13. 

 Oct. 14. 



Adult 



The time taken from the hatching of the nymph to the appearance 

 of the adult is thus only ten days, an extremely short time, and as the 

 females are quite prolific in their egglaying, the increase in numbers 

 of the insect is very rapid. 



Description of Stages. 



The Egg. — Length .48 mm., width .22 mm., flask-shaped with the 

 neck bent to one side. Top of egg crater-like, having a ragged border 

 and a circular impressed area that is cross-hatched witli delicate 

 markings. Tliis circular top is .13 mm. in diameter and acts as a 

 lid that is pushed aside when the young nymph hatches. Egg white 

 in color, translucent: surface smooth and shinv. 



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