84 



DECIDUOUS FRUIT INSECTS AXD ENSECTICLDES. 



Table XVII. — Larvse. of the first brood. Percentage of transforming and icintering 



larvse of cage material. 



Cage No. 



Number of larva?. 



Trans- Winter- 

 forming, ing. 



Total. 



Number of larva?. 



Cage No. 



Trans- Winter- 

 forming, ing. 



11 



7 



18 



4 



3 



7 ! 



9 



S 



17 



9 



6 



15 



14 



13 



27 



9 



27 



36 



2 



17 



19 



5 



14 



19 



7 



6 



13 



o 



11 



16 



2 



5 



7 



9 



4 



6 





13 5 17 



14 1 : 6 



15 • : 7 



16 12 



17 9 



18 . 19 



19 1 8 



Total./ S5 199 



Percent..: 29.93 : 70.07 



Total. 



22 



2S4 



Time of maturity of transforming larvse. — From apples collected in an 

 orchard July 8 the first larvae emerged July 10. while from banded 

 trees larvae were obtained three days later. In the rearing cages 

 the last transforming larva left the fruit August 14. (See Tables 

 XXII and XXXIII, and fig. 22.) 



Time of maturity of wintering larvae. — Of the band record material of 

 1909 two larvae, which had been collected July 19, did not transform 

 with the rest of the brood, but remained in the larval stage and 

 wintered. The second-brood larvae first appear about September 10. 

 (See fig. 22.) On examining the results of the band records, as pre- 

 sented in figure 21, it will be noted that the greater number of larvae 

 belonged to the first brood, and that the period of maturation of 

 these larvae extended from early July to the close of September, or 

 perhaps even to the early part of October. 



Percentages of transforming and of wintering larvse of the first hrood. — 

 In Table XYII is given a summary of breeding experiments, showing 

 the comparative number of transforming and wintering larvae of the 

 first brood. From these observations it will be found that in number 

 the wintering larvae exceeded the transforming larva? about two and 

 one-half times. These results agree closely with those obtained from 

 the band material, which is a better test of the relative occurrence 

 of larvae in the field. (See Table XXXIY.) Of the first brood 23.46 

 per cent of the larvae transformed and 76.54 per cent wintered. 

 Considering the two parallel records of both cage-reared larvae, the 

 first brood consisted thus of one-third of transforming larvae and 

 two-thirds of wintering larvae. 



