INVESTIGATrON OF TJI'M-: HISTORY. 



63 



The eg<^ records of 26 females are jjjiveii herewith, tlie beetles beiiii^ 

 rated as lar^e or suiall, those liavinfi; avera^jje iiieasiiremeiils that raiij^ed 

 above the <:;eneral average being placed in the former class, and those 

 below in the latter. 



Lur^e fi'iiiaU's. 

 Small females. 



Number. lEggs laid, 



3,848 

 1,846 



Average 

 of each. 



2.')(i. 5 



This indicates that more eggs are normally developed by large 

 females than by small ones. 



It was desirable to determine, however, if the size of the males had 

 any relation to the number of eggs produced, for if this were true the 

 reliability of the data above given might be open to c{uestion. 



Accortlingly, typical data were secured from 9 males antl 9 females 

 which had been mated according to size, and are as follows: 



Large male and lar^e female. 

 Small male and large female. 

 Small male and small female. 



Large uiiile ami small female. 



Eggs de- 

 posited. 



Total. 



490 \ 

 2U8 / 

 2(W \ 

 342 I 



{ 

 { 



U 189 1 



U 134 ) 



704 

 542 

 3f>4 



420 



Average 



per 

 female. 



3.^)2 

 271 

 182 



142 



This indicates conclusively that the size of the males is not an 

 im])ortant factor relative to the number of eggs that the fenudes will 

 jM'oduce, and although there is quite a wide variation in the number 

 of eggs laid by either large or small females, it demonstrates that 

 large females will lay more eggs even when mated with a small male. 



Sk.xks ok Bkkti.k.s |{k.\i{i:i). 



Ill order to determine the proportion of the dili'erent sexes of 

 C. sycop/ianta reared from eggs laid, a careful record was kej)t of the 

 sexes of the beetles that emerged in the spring of 1909 and 1910. 



Of 71 beetles that were secured 3i) were males and 32 were females 

 (1909). 



Of 512 beetles that were secured 2(U were males and 2ol were 

 females (1910). 



This indicates that under laboratory conditions practically the same 

 number of each sex is reared. 



