82 



DECIDUOUS FRUIT tNSECTS AND INSECTICIDES. 



The observations on the. molting habits of the second brood of 

 larvae (Table LXXVIII) were not all completed, us at times some of 

 the larvae were neglected on account of the stress of other work. 



Table LXXX. — Head measurements of first-brood and second-brood codling moth larvae, 

 collected from banded trees at Douglas, Mich., mil. 



1 Parasitized larvae. 



The result's from these observations are, however, similar to those 

 previously obtained. 



The pink color which is characteristic of the mature larva first 

 appeared a few days after the final molt. A number of mature first 

 and second brood larvae collected in the field were measured for a 

 comparison with those maturing in the laboratory. The records of 

 Table LXXX show no material difference in the size of head of the 

 larvae of the two sets except that the field larvae are slightly larger, 

 which is to be expected, since the latter have developed normally and 

 without any 'interference. 



Table LXXXI. — The average widths of the head of the larva in its successive instars and 

 the rate of increase at each molt; summary of Tables LX X IV-LX X IX . 



