12 



J. K. BREITENBECHER. 



It is the purpose of this paper to describe the origin and genetic 

 behavior of thirty-one elytral mosaic females which were discov- 

 ered among thousands of normal insects examined during the 

 progress of this work. The usual expectancy for homozygous 

 cultures is that the elytra of the normal females will be red-red for 

 the red mutant, black-black for the black one, white-white for the 

 white mutant, and tan-tan for the wild type. But for these thirty- 

 one cases, types of mosaic elytra have appeared, such as red-black, 

 black-red, black-white, black-tan, tan-black, and white-tan. It is 

 with these unusual types that this paper is concerned. 



TABLE II. 



THE EXPERIMENTS. 



The data and results from the breeding experiments which were 

 carried on during the years 1918-1920 are summarized, as they 

 bear upon the question of mosaics, in Tables I. and II. It seems 

 easier to interpret these mosaics if one describes them in the order 

 of their dominance (red, black, white, and tan, or the wild type). 



It is evident from consulting Table I. that no mosaic has ever 



