( H ) 



i. e. the centre of the fore- wing. It should be mentioned 

 also that all these examples are drawn to the same scale. 



" In spite of the differences that can be observed in the scent- 

 scales that I have shown, I am quite confident that I could 

 pronounce any of them without hesitation to belong only to 

 the napi group. The scent-scale of rapae and its near relatives, 

 though generally resembling that of napi, is always dis- 

 tinguishable. Still more easily so is that of brassicae and its 

 associated forms. By the kindness of Dr. Eltringham I am 

 also able to show that the genitalia of both rapae and brassicae 

 show quite distinctive features when compared with any of 

 those of napi." 



Dr. Longstaff observed that he had detected the verbena 

 scent peculiar to P. napi, both in oleracea and melete. 



Wednesday, May 3rd, 1916. 



The Honble. N. Charles Rothschild, M.A., F.Z.S., 

 F.L.S., President, in the Chair. 



Election of Fellows. 



Messrs. Leonard Charles Box, F.R.H.S., Dominion 

 Experimental Station, Freclericton, New Brunswick, and 

 Leonard Spencer Tatchell, Heathwood Road, Bourne- 

 mouth, were elected Fellows of the Society. 



Exhibitions. 



A Question concerning the hatching of eggs of 

 Stegomyia fasciata. — Mr. Bacot, in introducing this sub- 

 ject, gave in brief outline an account of some experimental 

 work carried out in Freetown, West Africa, dealing with the 

 hatching of eggs of this mosquito — full details of the experi- 

 ments and their results being published in his Report to the 

 Yellow Fever Commission. He pointed out that in addition 

 to the well-known ability of the eggs of Stegomyia fasciata 

 to retain their vitality when dried, that they were subject to 

 periodic hatching when actually immersed in water. Under 



