140 



B. P. UVAROV. 



All subsequent lines in the table (from the fifth downwards) give figures each for 

 a number of specimens from one locality and taken mostly at the same time, without 

 any selection, and regardless of the forms to which they belonged, in order to obtain 

 an impression as to proportion of both forms and of the extension and direction of 

 variability in each lot separately. We shall have to deal with these lines in more 



65 

 60 



53 



50 



i 



'i MO 



T 



35 



15 

 10 

 5 





<n 



rO — 



JVotx^tcuC pt-opoxtCo'-w,. 



Fig. 2. Diagram showing range of variation in the pronotal proportion in 358 specimens of 



Loctista migratoria, L. 



detail afterwards, but it may be noted that the range of variation is rather diffeient 

 not only in series of different origin, but also in lots taken at the same place in two 

 successive years, i.e., from swarms which may be regarded as two successive 

 generations. Examples of this kind will be found in lines 5 and 6, and 7 and 8, 

 of Table I. 



If we summarise the results of this attempt at a statistical study of the morphological 

 interrelations between migratoria and danica, they seem to be rather contradictory. 



