150 Inheritance ami Evohition in Ortlwptera I 



leucothorax progeny from this F^ culture bred true, when inbred, for 

 two generations, giving 11 leucothorax in Fr, and 21 leucothorax in F^, 

 (Table I, F,, F, and Fc). 



A pair of texanus from the F^ impure leuconotus culture, 

 when bred, gave 100 7o texanus, as did a similar pair from the 

 same generation of the impure leucothorax culture. Also a texanus 

 male from the F^^ texanus-leuconotus culture was mated to a texanus 

 female from the F^^ texanus-leucothorax culture and they gave 100 °/^ 

 texanus. 



The F4, leuconotus-leucothorax {BG) were inbred and gave, in 

 jPg, 29 leuconotus : 53 leuconotus-leucothorax {BG) : 31 leucothorax, 

 the expectation being 28*25 : 56*5 : 28-25, respectively. (Table I, F^.) 



The F5 leuconotus-leucothorax (BG) were again inbred and gave 

 in ^6, 5 leuconotus : 4 leuconotus-leucothorax (BG) : 3 leuconotus 

 (Table I, Fq). With this result the experiment was closed. 



Allowing the letters A, B,G, and D, as already suggested, to indicate 

 the homozygous texanus, leuconotus, leucothorax, and punctofemorata, 

 respectively, diagram 1, with Table I, will show at a glance the inherit- 

 ance behaviour in this experiment. 



(2) An analysis and the inheritance of the colour ^mtterns of forms 

 of the appearance of luteolineatus and rufrolineatus. 



Experiment II. Early in September, 1909, among several specimens 

 secured in the vicinity of Many, Louisiana, were a male of the appear- 

 ance of rufrolineatus {F) (Plate VI, fig. 6) and an immature female of 

 the appearance of luteolineatus {E) (Plate VI, fig. 5). When the female 

 became adult this male of the appearance of rufrolineatus was mated 

 to her, and their progeny which hatched in November, after great 

 mortality, matured the following March and showed four types in F^ 

 as follows : 4 of the appearance of rufrolineatus : 2 intermediate between 

 rufrolineatus and luteolineatus : 2 of the appearance of luteolineatus : 

 2 texanus (Table II, (a), F-^). These F^ progeny were bred further 

 as follows : (a) a pair of the appearance of rufrolineatus were inbred 

 and gave in F.^, 43 of the appearance of the parents (rufrolineatus) : 13 

 texanus. This shows clearly that the F^ individuals of the appear- 

 ance of rufrolineatus were really texanus-rufrolineatus {AF) hetero- 

 zygotes. This fact, the visibly clear luteolineatus-rufrolineatus {EF) 

 heterozygous character of two others of the F^ progeny and the fact 

 that still two others were the always homozygous texanus {A), without 

 considering the two individuals of the appearance of luteolineatus which 



