( lxxvi ) 



length occurs, when advancing evening makes it necessary to 

 appropriate the resting place without the final verification. 

 Thus a Pieris or a Euchlo'e will learn to accept as a resting 

 place any white object, even if it be not a flower head of a 

 Crucifer. 



But if it be objected that cabbage and turnip, the usual 

 foods of our "cabbage" butterflies, have yellow flowers, the 

 reply is that these foods, for these butterflies, are entirely 

 human inventions, and therefore comparatively modern. 

 Their natural foods have chiefly white flowers, such as, 

 Xasturtium, Arabis, Draba, Cochlearia, Thlasjn, Lepidiivm, 

 Ttirritis, Alliaria, and many others, the two last mentioned 

 being the favourite foods of E. cardamines. It may also be 

 suggested that the frequently very yellow under-sides of our 

 common " cabbages " are due to the yellow flowers of our 

 cultivated Brassicas, and of such wild Crucifers as Raphanus 

 sinapis, and Barbarea. 



The President, Mr. A. J. Chitty, Dr. F. A. Dixey, Pro- 

 fessor E. B. Poulton, and other Fellows offered observations 

 on the subject. 



Papers. 



Mr. William John Lucas exhibited diagrams of the instars, 

 and also of the mouth parts of the imago, to illustrate the 

 paper read by him " On the Emergence of Jli/rmeleon 

 formicarim." 



Mr. Martin Jacoby communicated a paper entitled 

 " Descriptions of New Species of African Ilalticinx and 

 Galerucina ." 



Mr. Claude Morley communicated a paper " On the 

 Tchneumonidous group Tri/jthoitides schizodonli, Holm«.'i\, 

 with Descriptions of New Species." 



