39 



monly produces a distorted bloom (PI. VI, fig. 30) and in ver}' severe 

 eases tlie boll will drop soon after setting. 



After the females begin to oviposit their feeding habits become 

 quite different fi-om those of the males. Uj) to this time both sexes 

 move but little, making a number of iDunctures in a single square; but 

 from this point we must consider the feeding habits of the sexes sep- 

 arately. 



MALE. 



Studies of the feeding habits of males have been made both in the 

 laboratory and out of doors. In the laboratory (iS males were under 

 observation during a total period of 2,492 weevil-days." During this 

 period 2,185 squares were supplied them and they made 5,017 feeding 

 punctures in 1,582 of these squares. A little calculation shows that they 

 averaged to make 3^ feeding punctures in each square, at the rate of 2:^ 

 punctures a weevil each day. These observations were in most cases 

 made during the latter part of each weevil's life. During the first few 

 days they have often been found to make from G to 9 punctures a day. 

 A general average of 3 feeding punctures a daj^ in the laboratory 

 would seem to be near the actual figures during the warm weather. 



As each male while under observation attacked only about 2 

 squares every 3 days, the destructiveness of males seems compara- 

 tively slight. 



Five males were followed upon plants under a field cage for a total 

 period of 145 weevil-days. During this period thej' attacked 68 

 squares, making tlierein a total of 177 feeding punctures. This 

 means an average of 2.G punctures per square and an average of 1.2 

 punctures per male per daj^ making the number of squares attacked 

 by each male less than 1 every 2 days. These outdoor observations 

 indicate that the laboratory results, small though they appear, are 

 yet higher than the actual field numbers. Whether in or out of 

 doors, the activity of feeding decreases as the male grows older. 



Males choose to puncture more often than do females through the 

 tip portion of the square not covered by the calyx. The yellow or 

 orange colored excrement is abundant, and owing to the somewhat 

 sedentary habits of the males it accumulates often in quite large 

 masses. 



FEMALE. 



After they begiu to oviposit females seem generally to feed less 

 upon one square or in one puncture than they do previous to that 

 time. They obtain quite a considerable portion of their food from 

 the excavations which they make for the deposition of their eggs, and 

 as they show a strong inclination to oviposit only in clean or pre- 

 viously uninfested squares, their wandering in search of such squares 



" The term ' ' weevil-day ' " is used for convenience to designate the product of 

 the two factors; number of weevils multiplied by the niimber of days. 



