8 



entire number being nearly 175 eggs per female. According to the 

 same writer, about 45 per cent of the eggs of the indi\dduals above men- 

 tioned were deposited during the first two weeks, and 73 per cent of the 

 entire number were deposited during the first month after emergence. 

 Beetles are to be found on the vines during a considerable period, owing 

 to their longevity and to an irregularity in emergence, though, as 

 stated, oviposition is largely done during the three or four weeks fol- 



FiG. 1.— Grape root-worm (Fidia viticida): a, Adult or beetle; b, eggs on cane, about natural size; r. 

 eggs, enlarged; d, full-grown larva; e, pupa; /, f,g. roots of grape, showing injurj' by larvae; h. 

 grape leaf, showmg characteristic chain-like feeding marks made by beetles, a, c, d, e, Much 

 enlarged; ft, g, about natural size; /, h, reduced. 



lowing emergence. Upon being disturbed many of the beetles will lose 

 their hold upon the vines and fall to the ground in their efforts to escape 

 detection. Advantage may be taken of this fact, as explained later, 

 to collect the insects from the vines by jarring. 



Egg. — Eggs are deposited in patches usually from 25 to 40, some- 

 times less, but rarely more, according to Slingerland, mostly under the 



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