150 Tnheritancf and Evolution in Orthoptera I 



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

 two generations, giving 11 leucothorax in F, and 21 leucothorax in F,i 

 (Table l,F,,F,sind F,). 



A pair of texanus from the Fi impure leuconotus culture, 

 when bred, gave 100 °/^ 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 7o 

 texanus. 



The Fi leuconotus-leucothorax (56') were inbred and gave, in 

 F^, 29 leuconotus : 53 leuconotus-leucothorax \BG) : 31 leucothorax, 

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



The Fr^ leuconotus-leucothorax {BC) were again inbred and gave 

 in F,i, 5 leuconotus : 4 leuconotus-leucothorax (BC) : 3 leuconotus 

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



Allowing the letters A, B,C, 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 patterns of forms 

 of the appearance o/'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 innnature female of 

 the appearance of luteolineatus(£') (Plate VI, fig. 5). When the female 

 became adult this male of the appearance of rufrolineatus was mated 

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

 mortality, matured the following March and showed four types in Fj 

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

 rufrolineatus and luteolineatus : 2 of the appearance of Inteolineatus : 

 2 texanus (Table II, (a), Fi). 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 apf)earance of the parents (rufrolineatus) : 13 

 texanus. This shows clearly that the Fi individuals of the appear- 

 ance of rufrolineatus were really texanus-rufrolineatiis (AF) hetero- 

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

 heterozygous cliaracter of two others of the Fi progeny and the fact 

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

 considering the two inilividuals of the appearance of luteolineatus wliieh 



