A. Iv (VUIKHOX •')7 



more days. Tho fomnle lavs tho ofrjrs (Text-fig. 2) superficially on the 

 under side of the leaf (only once have I observed the eggs on the upper 

 surface), geneially in neat, parallel rows, the eggs of any one row being 

 closely applied to each other laterally and seemingly held together by 

 a kind of cement which also serves to attach the eggs to the leaf surface. 

 A good idea of what is meant will be obtained from the figure. The 

 number of eggs in any one row as well as the number forming an 

 egg-grou]) vaiies. All sorts of combinations may be got. The luunber 

 may be as low as one or two and there may be as many as fifteen or 

 t\ventv, and even more. On the same leaf, a])])aiently depending on 



Fio 



Eggs of Pegomyia hijoscynmi on iukIit surtaic of a belladonna loaf. X9. 



its size, there is often more than one group of eggs and rare cases of three 

 or four are recorded. The flies seem to show a preference for the leaves 

 of the top shoots, but later on in the season the radical leaves become 

 quite as badly attacked. 



The eggs hatch in from four to five days, but as long an interval as 

 five to six days has been recorded. Farsky (p. 109) states the period 

 to be six to eight days in the case of the synonym, P. conformis, and 



