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PTEROPHORUS DICHRODACTYLUS. 
Plate CXXXI. Figure 19. 
Localities for this species are Scarborough, Warring- 
ton, Chudleigh. 
The perfect insect appears in July and August— 
July 5. 
The date of the appearance of the caterpillar is at 
the end of June and in July. 
It feeds on the tansy (Tanacetum vulgare). 
I am obliged to H. T. Stainton, Esq., for the loan 
of a specimen of the present species for the use of 
this work. 
The drawing from which the engraving has been 
made, has been obligingly forwarded to me for the 
use of this work by C. S. Gregson, Esq., as have 
also drawings or specimens of the whole of the genus. 
I am placed under very deep obligations to him for 
unvarying kindness and assistance in every possible 
way. 
PTEROPHORUS ISODACTYLUS. 
Plate CXXXI. Figure 20. 
Localities for this species are Orkney, Killarney, 
and Teignmouth. 
The perfect insect appears in July and August. 
