MIGRATIONS OF PAPILIONACEOUS INSECTS. 179 
however, from the present subject, to treat on the 
wonderful irregularity of insect appearance ; some 
curious facts concerning this I will reserve for a 
future opportunity ; but it is nevertheless worthy 
of being observed here, that the Painted Lady 
Butterfly, which is remarkable, in most places, for 
the extreme irregularity of its occurrence, is equally 
remarkable in others, (as in some parts of the west 
of England, and in Jersey,) for appearing with 
great regularity. 
« A very singular cireumstance is also related of 
the Cynthia Cardui, by Mr Knapp, in his amusing 
and excellent ‘ Journal of a Naturalist.’ After 
some other remarks on the species, he observes that 
“some years ago a quantity of earth was raised in 
cutting a canal in this county (Gloucestershire ;) 
and in the ensuing summer, on the herbage that 
sprang up from the new soil on the bank, this but- 
terfly was found in abundance, where it had not 
been observed for many years before. Might we 
not reasonably expect, if the soil about Hamp- 
stead were to be turned up, on any occasion, to 
some depth and extent, that the extraordinary and 
distinctly marked butterfly, Cynthia Hampstedien- 
sis, would reappear, although so many years have 
now elapsed since it was last seen ?” * 
* Field Naturalist’s Magazine, p. 469. 
