154 lalieritance ami Evolntion in Ortlioptera I 



conditions and they gave in F.^ 8 leuconotus : 19 leuconotus-luteo- 

 lineatus : 6 luteolineatus, the expectation being 8'25 : 165 : 825, 

 respectively. One of the hiteolineatus F^ males (Table II (6), F^ 

 was mated to a virgin female of the same apparent constitution but 

 whose pedigree is not known, and they gave in F^ 100 ""/^ luteolineatus, 



(c) The other luteolineatus-rufrolineatus {EF) heterozygous male 

 (Table II (a), F^ was mated to an extracted homozygous leucothorax 

 ((7) female from a culture whose parents were both leuconotus-leuco- 

 thorax {BG) heterozygous individuals (Table I, F^, C). (This female 

 was a sister of the leuconotus female parent in mating (6) of this 

 experiment.) They produced the following F^ progeny : leucothorax- 

 rufrolineatus (CF) 17 : leucothorax-luteolineatus 21, the expectation 

 being 19 of each kind (Table II (c), F,). The behaviour of this EF 

 male when mated to a homozygous leucothorax female was exactly the 

 same as that of his brother when mated to a homozygous leuconotus 

 female. Both behaviours reveal the constitution of the males,, as well 

 also as that of the females. 



The inbreeding of these F^ leucothorax-rufrolineatus (CF) and 

 leucothorax-luteolineatus (OF) individuals, respectively, gave F^ results 

 as follows : two pairs of leucothorax-rufrolineatus (OF) were inbred, a 

 pair in each of two cages. The pair in cage (a) produced 7 leuco- 

 thorax : 13 leucothorax-rufrolineatus (CF) : 4 rufrolineatus, and the 

 pair in cage (h) gave 17 leucothorax : 48 leucothorax-rufrolineatus 

 (OF) : 25 rufrolineatus ; both pairs giving a total of 24 leucothorax : 61 

 leucothorax-rufrolineatus (CF) : 29 rufrolineatus, the expectation being 

 28-5 : 57 : 28'5, respectively (Table II (c), F.,). 



The leucothorax-luteolineatus (CE) were inbred, one pair in each 

 of two cages. Pair (a) produced 12 leucothorax : 12 leucothorax-luteo- 

 lineatus (CE) : 3 luteolineatus, and pair (6) gave 10 leucothorax : 41 

 leucothorax-luteolineatus (CjE*) : 16 luteolineatus; both pairs producing 

 totals of 22 leucothorax : 53 leucothorax-luteolineatus (CE) : 19 luteo- 

 lineatus, with the expectation of 23*5 : 47 : 235, respectively (Table 

 II (c), F,). 



These F2 leucothorax-luteolineatus (CE) were inbred under excep- 

 tionally unfavourable circumstances, 1 male x 1 female, and they gave 

 in -^3 8 leucothorax : 6 leucothorax-luteolineatus : 3 luteolineatus, the 

 expectation being 4'25 : 8*5 : 425, respectively. A pair of these F^ 

 leucothorax-luteolineatus individuals were inbred, and after great 

 mortality, gave in F^, 4 leucothorax : 1 leucothorax-luteolineatus (CE) : 

 2 luteolineatus, the expectation being 1*75 : 3*5 : 1'75, respectively. 



