W. BOWATER 



301 



Another difficulty is that this species is particularly liable to 

 succumb in confinement even in the hands of the most expert, and 

 inbreeding seems always fatal. 



Aplecta nehulosa. 



Imagines 



* Approximate numbers. 



The melanic form does not appear to be increasing in Delamere 

 Forest, and of 972 imagines reared by Mr Mansbridge from larvae col- 

 lected there during the last 9 years, 142 are melanic, but only 3 of 

 these are thompsoni. 



Thus it seems that although melanism is dominant in this species, 

 yet in Nature there is some factor which counterbalances this at present, 

 and prevents the variety becoming more common. 



3. Triphaena comes. Messrs Prout and Bacot^ conducted breeding 

 experiments in 1903, 1904, which showed that in this species melanism 

 is dominant, but not completely so, as its depth varies, but Mendelian 

 segregation occurs. 



4. With Boarmia repandata, Mr Mansbridge has been experimenting 

 for some years, but quite conclusive results are not expected until 

 next year. 



5. The same applies to Tephrosia consonaria and Mr J. W. H. 

 Harrison. 



^ Proc. Ent. Soc. Lond. October 21, 1908, p. Ixi. Proc. South Lond. Entom. and Nat. 

 Hist. Soc. 1908—09, p. 84, and 1909—10, p. 64. 



- Trans. Ent. Soc. Lond. May 3, 1911. 



3 Ent. Record, Vol. xv. 1903, pp. 217—221 ; Vol. xvi. 1904, pp. 1—5. Proc. Ent. Soc. 

 Lond. 1905, pp. 67—71. 



