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JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 10 



eggs have been deposited in a bit of wood are the tufts of fibre (Plate 

 29, figs. B, C) which project above each egg sUt. The egg hes in a 

 slanting position with the filament projecting out to the bark. 



Submergence of the eggs by flooding the bog from the usual time in 

 December until late in the following May does not render them invi- 

 able. Late holding of the winter flowage, say until May 30, simply 

 retards their hatching, the nymphs appearing early in June. On dry 

 bogs hatching begins about the middle of May. At New Egypt, N. J., 

 four nymphs of the first instar were found May 21 on a bog which had 

 not been winter flowed. 



Nymphal Stages 



Nymphs first appear on the bogs in late May but are few in number 

 until the latter part of June and early July. The usual spring reflows, 

 then, cannot be depended upon to clear bogs of this insect since they 

 are given at a time when very few nymphs have hatched. The 

 nymphs of the first and second instars are almost wholly white, while 

 those of later instars are darker in color and bear on the body many 

 long, white, waxy filaments (Plate 29, figs. E, F) . They run with consid- 

 erable speed on the vines and are strong in jumping. Probably the 

 easiest way to locate an infestation is by use of the sweepnet, many 

 being caught by simply sweeping the tops of the vines. The majority, 

 however, will be found closer to the ground or on the trash beneath 

 the vines. They derive nourishment by sucking juices from the woody 

 parts of the vines and yet they do not injure the vines to any appre- 

 ciable extent as do the toadbugs (Phylloscelis atra Ger.). 



There are five nymphal instars and, as shown in Table 1, the 

 nymphal period may be prolonged from early summer until mid-fall. 



Table 1. — Instars of Amphiscepa bivittata Sat, Pemberton, N. J., 1914 



An average could be taken of the duration of each instar but it will 

 be seen that the total nymphal period of each bug was a very variable 

 quantity and probably was greatly influenced by condition of food and 

 environment. 



The field records show that nymphs were found on the bogs from 

 May 21 until as late as October 11. 



