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Genus PIERIS. 
According to the definition which it has been 
found necessary to give to this genus in general works 
on the lepidoptera, it includes a very extensive range 
of species, and may be said to be represented in 
this country by the white butterflies, which British 
authors generally place in the genus Pontia. In 
this extended acceptation, however, it comprehends 
individuals somewhat diversified in appearance, and 
■which may be assumed as the types of particular 
groups or sub-divisions, perhaps of sufficient im- 
portance ultimately to become genera, if a corres- 
ponding dissimilarity he found to characterise their 
different states and metamorphoses. The antennas 
are of moderate length or slightly elongated, the 
articulations pretty distinct, the club ohconic and 
compressed ; palpi thickly covered with fascicles of 
long hairs, the terminal joint at least as long as the 
penultimate : wings of ordinary size, the discoidal 
cell closed ; the under pair partially embracing the 
abdomen : eyes naked, head rather small. 
The caterpillar is elongated, and nearly cylindri- 
cal, pubescent, and marked with longitudinal rays ; 
the head small and rounded. Chrysalis terminating 
in a single conical point anteriorly, attached by the 
tail and a medial hand. 
