( 20 ) 



one sex of a butterfly at any given time was more in evidence 

 than the other. Of course, in such cases it was certain 

 that the other sex must be somewhere. Mr. Millar, of 

 Durban, had drawn his attention to the fact that, speaking 

 generally, the males were more apt to be on the wing during 

 the morning, and the females in the later hours of the day. 

 Mr. A. K. Wallace mentions that the males and females of 

 certain South American Pierines, of which the male- are 

 practically ordinary white butterflies and the females are 

 [thomiine mimics, have diff erenl habits and do not fly together. 

 The female-, accompany their models in Bight, which Bug 

 the significance of the lnl.it. The fact that some means of 

 protection required the adoption of a corresponding habit to 

 make them effective, of course did not carry with it any 

 assumption of eon- on the part of the insect of the 



livl 

 significance of its behaviour. The habit was of the nature 



Of a reaction Or response, which, like Other adaptations, had 



grown up under the influence of natural selection. 

 Dr. Longstafi observed that in North Africa certain B] 



of Teracolus gave abundance of <$ <$ in the morning, whilst in 

 the afternoon the 9 ? predominated greatly. 



Commander WaLREB, Mr. G. .\. K . MARSHALL and Prof. 



Poultoh also took part in the discussion. 



The C n oi Deilemeba antdtobii, Obbbth. — Prof. 



i roM exhibited the cocoon ><\ the Kypsid moth Deilt 

 antinorii, Oberth., which Mr. W. A. Lambobn described (see 

 p. xlvi), and had intended to exhibit on June 7 Last. He 

 stated that Mr. Lamboru had written on September 4, since 

 his return to the Lagos district: 'The larva passes the cocoon- 

 like bodies through the anus, as yon surmised." A little 



later, on September 1 ( >, Mr. Lamhorn had written: " I cannot 



add more precise information as to the way iii which the 

 cocoons are formed, for the larvae which have hitherto -pun 

 up. diil so at a tune when 1 could not conveniently observe 

 them. 1 saw, however, a few more of the Braconid-cocoon- 

 like bodies passed /- r anum at the end of the cocoon opposite 

 that at which the larva was spinning, and when several had 

 accumulated the larva turned round and distributed them." 



