PREFACE. XI 



black, or nearly black specimens are now regularly obtained, 



are : — 



Odontopera bidentata, 



Phigalia pilosaria, 



Amphydasis betularia, 



Boarmia repandata, 



Tephrosia biundularia, 



Venusia cambricaria, 



Hybernia progemmaria, 



Oporabia dilutata, 



Larentia multistrigaria, 



Eupithecia castigata, 



Eupithecia albipunctata, 



Hypsipetes impluviata, 



Hypsipetes elutata, 



Cidaria russata, 



Cidaria immanata, 



Acronycta niegacephala, 



Acronycta ligustri, 



Acronycta rumicis, 



Acronycta menyanthidis, 



Xylophasia polyodon, 



■ Apamea oculea, 



Miana strigilis, 



Epunda viminalis, 



Hydrocampa nymphaealis, 



Scoparia mercuralis, 



Tortrix pyrastrana, 



Sciaphila virgaureana, 



Sciaphila octomaculana, 



Diurnea fagella. 



Other species of which specimens so much darker than the 

 typical forms are so frequently taken as to indicate that they 

 too are gradually being influenced towards the same end, 

 include : — 



