154 Inheritance and Erohition In Orlhoptera 1 



conditions and they gave in F^ !S louconotus : 19 leiiconoUis-luteo- 

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

 respectively. One of the luteolineatus F^ males (Table II (t), F.^ 

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

 whose pedigree is not known, and they gave in F-^ 100 7o luteolineatus. 



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

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

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

 thorax (5C) heterozygous individuals (Table I, i^^, C). (This female 

 was a sister of the leucontitus female parent in mating (b) »{ 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 (GF) and 

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

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

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

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

 jjair in cage (b) gave 17 leucothorax : 48 leucothorax-rufi'olineatus 

 {GF) : 25 rufrolineatus ; both pairs giving a total of 24 leucothorax : 61 

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

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



The leucothorax-luteolineatus {GE) were inbred, one jjaii' in each 

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

 lineatus {GE):S luteolineatus, and pair (b) gave 10 leucothorax : 41 

 leucothorax-luteolineatus (GE): 16 luteolineatus; both pairs producing 

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

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

 II (c), F.;). 



These F.. leucothorax-luteolineatus (GE) were inbred under excep- 

 tionall}' unfavourable circumstances, 1 male x 1 female, and they gave 

 in F;, 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 leucothoiax : 1 leucothorax-luteolineatus (GE): 

 2 luteolineatus, the expectation being 1'75 : 3'o : r7o, respectively. 



