79 



from oviposition she would be forced to deposit more than one egg 

 in a square. 



Not only do females show a strong inclination to place only one egg 

 in each square, but they also object to making both egg and feeding 

 punctures in the same square. That these conclusions are well 

 grounded may best be shown by giving a summary of two long series 

 of observations, the first made in the laboratory in the fall of 1902 

 and the other made in the field partly in the fall of 1902 and partly in 

 the spring of 1903. 



LABORATORY OBSERVATIONS. 



Nine females were used in this series of experiments. The time 

 followed varied with each individual, but ranged from October 23 to 

 December 18, 1902. During this period a total of 868 uninfested 

 squares was supplied to these 9 females. Of these squares 238 were 

 not touched, while 630 were punctured, either for oviposition or for 

 feeding or for both. The general results are here summarized in 

 tabular form. 



Table XVII. — Selection of squares and relation of feeding to oviposition. 



No. 

 of fe- 

 male. 



Period of observation. 



Squares 

 supplied. 



Squares 



with 1 



egg each. 



Squares 



with 2 



eggs 



each. 



Squares 

 fed on 

 only. 



Squares 



with 



both 



eggs and 



feeding. 



Squares 



un- 

 touched. 



1 

 2 

 3 

 4 



1902. 



October 23 to November 15 



October 23 to November 27 



October 25 to November 7 



October 23 to October 28 



135 



171 



96 



32 



38 



91 



75 



107 



123 



72 

 102 

 74 

 13 

 30 

 34 

 41 

 48 

 63 



2 

 2 

 4 

 

 1 

 

 3 

 1 

 6 



25 

 29 

 8 

 6 

 2 

 5 

 7 

 12 

 16 



1 



7 

 1 

 4 

 2 



1 

 1 

 1 



6 



35 



31 



9 



9 



5 



October 23 to October 28. . . 



3 



6 

 7 

 8 

 9 



November 10 to December 5 



November 10 to November 25 



November 10 to December 18 



November 11 to December 12 



Total 



51 

 23 

 45 

 32 





868 i 477 



19 



no 



24 



238 













A little calculation from these results shows that 82.5+ per cent of 

 all squares attacked received eggs and that 91.7+ per cent of all 

 squares oviposited in received only one egg each. The squares which 

 were fed upon formed only 17.5— per cent of the total number 

 attacked, and those receiving both egg and feeding punctures consti- 

 tuted only 3.8 per cent. The squares receiving two eggs each also 

 formed 3.8 per cent of all the squares which received eggs onty. 



The tendency to confine egg and feeding punctures to separate 

 squares is strongly emphasized by the fact that in 17 instances, in 

 which a total of 116 squares was provided, 91 received eggs only, while 

 the remaining 25 were fed upon onty; another total of 78 squares 

 received 88 eggs in 72 of them, while the remaining 6 were fed upon 

 only. As these two lots include nearly one-third of all the squares 

 punctured, the tendency may be clearly seen. 



