Analysis of Heterogeneity in Complex Chaeactees 



267 



in biotype 6, where the addition of the posterior marginal areas may produce a 

 pattern with the posterior half almost uniformly black. From the same com- 

 bination there not infrequently results biotype 5, which lacks entirely the mar- 

 ginal areas, but is otherwise like the pattern of biotype 6. 



F2- 



Biotype 4 + Biotype 1 + 



multitaeniata form multilineata form 



Pig. 50. — Graphic representation of effect of form-factors upon the pronotal 

 pattern type. 



Biotype 8 Biotype 7 



Fig. 51. — Showing effects produced In crossing of biotype 7 with biotype 12 and 

 results produced in the alteration of pattern. 



Different results follow when the neutral biotype 7 is combined with biotype 

 12, which gives as an F3 extracted biotype 8 (fig. 51,) and in the same way bio- 

 type 8 crossed with biotype 9 will give in F2 and F3, as an extracted type, the 



