( xxix ) 



" No. 6. — Has better held its own than the foregoing series, but 

 three specimens would intimate that this, too, may retrograde in 

 the next generation. The rich colour of the ground, although 

 rare at Dover, does not seem an individual peculiarity; it may be 

 seen in the progeny of Nos. 1, 4, and 5. The insects of this 

 series appeared weakly and wanting in moisture to enable them to 

 extrude from the pupa. Most of them would have been sad 

 cripples but for assistance rendered. 



" Nos. 7 and 8. — Like the normal 2 and 3, closely follow the 

 parents. The specimen, which emerged in the winter, is of a 

 deeper colour. This series does not suggest much change of 

 appearance. 



" From eggs deposited on the setting- boards by two strongly- 

 marked captured females, the three further examples were bred ; 

 they corroborate the argument, and show like Nos. 4 and 5, a 

 retrogression similar to the advance of No. 1 . 



" Summary of results. 

 •' The summary of this exhibit would seem to be that a race or 

 form of Cidaria svffumata is not being set up in the neighbour- 

 hood of Dover, but that there is a see-saw from the common to 

 the pale form, with distinct black central band, and vice versa. 

 That both the progression and retrogression is one of stages, the 

 first either way being very gradual and much assimilating the 

 characters of the parent, whilst from the second to the third 

 transition there is a great advance in the desired direction, 'i'he 

 extremely white specimens belong apparently to a stage that is 

 seldom attained." 



In the discussion which followed, the President, Mr. Jenner 

 Weir, Mr. Waterhouse, Mr. Distant, Dr. Sharp, and Mr. Stainton 

 took part. 



Mr. A. G. Butler communicated a paper on " New genera and 

 species of Lepidoptera-Heteiocera from the Austrahan region," in 

 which 21 new genera and 103 new species were described. 



Mr. J. S. Baly communicated a paper on " Uncharacterised 

 species of Diahrotica." 



