VARIATION IN THE GENUS EREBIA. 7 



Aciclalia x>yomutata, Tliera variata (var.), and a diminutive Aci- 

 dalia aversata. 



I spent the afternoon of Sept. 7th at Bentley Wood, and 

 curious to say, the only Macro I took was Macaria notata, 

 evidently a second brood. Micros, however, were beaten in 

 numbers. I boxed about fifty altogether, including Cerostoma 

 radiatella (a variable series), C. costella, C.sylvella, C. vittella {?), 

 Chelaria hiibnerella, Penthina hetulcstana, Dictyopteryx contamin- 

 ana, and Ephippiphora himaculana {Halonota similana) ; Grapho- 

 litlia penkleriana was also found in great numbers; also several 

 Peronea ferrugana and Poedisca solandriana, one or two of the 

 latter being variable forms. 



Up to the time of writing, October has yielded Diloha ccendeo- 

 cephala, Polia flavicincta (several), Eubolia cervinaria (four), 

 Cidaria miata, and Orthosia macilenta. 



I must not close this review of the season without expressing 

 my indebtedness to Mr. Barrett and the Eev. E. N. Bloomfield 

 for kind assistance in determining my Micros. 



Thornley Place, Waterloo Eoad, Ipswich. 



VARIATION IN THE GENUS EREBIA. 



By Geoffrey SanTH. 



Part I. 



(Continued from Entom. xxxiv. p. 308.) 



It is now time to look back at Table II. in the light of the 

 foregoing remarks. This table, which actually represents case 

 (1) is typical also of case (4). In both these cases the sex that 

 is in the minority is also constant. A discussion of this constant 

 factor is necessary. In Table II. the constant female heritage 

 of 4g- was added to the variable male heritages, and in this way 

 the powers for the next generation were raised, with a corre- 

 sponding rise in the mean power. But if males and females are 

 in equal numbers in the next generation, then the powers in 

 column 6, Table II., must be equally distributed between males 

 and females. But the females have a constant power, viz. 9, 

 hence the calculated mean power for the males will be 4|^, which 

 is the same as in the preceding generation ; hence no rise of 

 power has taken place. In other words, the deductions that 

 were made from this table can only hold good if the females of 

 the next generation are ignored. I believe that there is good 

 reason for ignoring them. For what is the meaning of this 

 constant state of the females and variable state of the males ? 

 It means, firstly, that the variable state of the males has no 



