Sexual and Parthenogenetic Forms 325 



or very few were produced. Some females gave birth only to 

 parthenogenetic young, others first to parthenogenetic and after- 

 ward to a mixture of parthenogenetic and sexual young. The 

 following records give the kind and the number of offspring for 

 ten isolated females. 



The parthenogenetic females are indicated by P, the males 

 by M, and the sexual females by F. 



First female, Aug. 21 to Sept 5. 



3 P, 3 P, aP, 4 P, S P, 3 P, 4 P, 6P, 3 P, 3 P, aP, 3 P, 3 P, iP, iP. Total, 46 P. 



Second female, Aug. 21 to 25. 



3 p > 2P ' 3 p - Tota1 ' I4P > 3 M > and 2F - 



Third female, Aug. 23 to 28. 



2F, 2F, 3 F, 6F, 3 F, 2F, iF. Total, i 9 F. 



Fourth female, Aug. 26 to Sept. 20. 



6P, S P, S P, 4 P, 3 F, 2F, o, { JM I ^ 2M, 4 F, { *M 5 F, 3 F, 4 F, 9 F, 



o, o, o, 2F, iF, iF, 2F, o, o,'o. Total, 2oP, 6M, 44 F. 

 Fifth female, Aug. 3 to Sept. 19. 



T, f <M. { iM , T f 2M f iM f iM 17 <17 17 f 17 T7 17 



4 F '{ 4 F, | IF , IM ' | 3 F, | 3 F, | 3 F, 3 F > 6F > 3F, iF, 4 F, 2 F, iF, 

 ;F, iF, 6F, 4 F. Total, nM, 56F. 



Sixth female, Aug. 3 i to Sept. 20. 



f aM F f 4M r 2M ( 3 M f 3 M F F F F F F 6F F 



\aF, 5 *' \iF, laF, \ iF, \6F, 3 ^' 7 *' 2f ' 4 ^' 5 *' 3 1 M i "i 

 2F, iF, 5F, o, o, iF, iF, o, o. Total, i 4 M, 56F. 



Seventh female, Sept. 16 to Oct. i. 



3 F,o, 2F, l 1 ^ {4^ |*M ^ 4Fj 4Fj 5Fj ap> 4F> 2F? ^ sp> 



Total, gM, 5iF. 

 Eighth female, Sept. 16 to Oct. 7. 



f iM 17 ,, f 2M ^ TV^T f iM f iM f 2M T7 T7 17 17 u 



i iF, 3 F > IM > { 4 F, 2F ' 4M, { jFf | IF> { 4F> iF, 2F, aF, 3 F, 3 F, 

 o, 3 F, 2F, iF, 4 F, o, 2F, 2F, o, iF, 3 F, o, 2F, iF, 2F, o, iF, iF. 

 Total, i2M, 55 F. 



Ninth female, Sept. 16 to Sept. 26. 



4 F, iM, iF, { 3^ xM, o, 3 F, o, 4 F, 4 F, iF. Total, 5 M, i8F. 



L - 11 > 



Tenth female, Sept. 16 to Oct. 4 . 



3 M > {2^ {2^ IF ' 4 F > 3F, 3 F, iF, 3 F, 4 F, tF, iF, aF, aF, iF, o, 

 o, iF,'iF. Total, 6M, 3 2F. 



