STUDY OF VARIATION IN THE RACES OF ZYGAENA FILIPENDULAE, L. 149 



some Italian races of subspecies stoechadis, Brkh. 



35 18 



51 26 



2 

 9 18 



5 

 11 2 

 11 3 



2 



3 



1 

 4 



13 



59 32 



9 5 

 1 2 



2 

 6 3 

 1 1 

 4 



39 24 



32 23 



3 



1 1 

 2 



2 1 



1 

 1 



22 16 



4 

 2 4 



1 5 



5 4 



1 



3 1 



22 29 i 45 67 



1 



2 3 



1 



1 3 



4 1 



12 10 



red rays, and guttata, mihi, with only one red spot, corresponding to 

 aterrinia, Vrty., and finally ui/jrata, Dz., in which the dark spot fills 

 the cell to its further extremity and obliterates red spot N.5. Forms 

 bi'juttata and guttata are not so much successive grades as parallel to 

 each other, like the homologous six- and five-spotted forewing forms, 

 due to the greater or lesser effects of the " atrophied zone " on the 

 pattern. 



In the following statistical table I have endeavoured to show 

 at a glance how the leading individual forms are distributed in several 

 Italian races. They are the races of which I possess sufficiently 

 extensive series of specimens collected at random to show variation as 

 it occurs in nature. In the first column the various parts of the 

 pattern are designated by letters and their extent by figures, so that 

 putting them together " formulas " are obtained expressing the 

 individual variations much more briefly and clearly than the compound 

 names of the second column. I think that a method of this sort will 

 be found necessary in future, now that analytical studies are pushed 



