14 BUTTERFLIES. 
means of its hind feet to a little pad of silk, and will change 
to achunky, bright-green pupa or chrysalis, marked with 
small golden spots, one of the most beautiful objects that 
can be imagined. This color gradually becomes darker, 
finally brown or blackish and then the butterfly will emerge. 
This insect is not injurious, but simply illustrated to serve 
as a type of the family to which it belongs. The illustra- 
tions, Figs. 12 and 16, give all the stages of this insect. 
THE SPINY OR THORNY CURRANT CATERPILLAR. 
(Grapta comma Harr.). 
These peculiar caterpillars are sometimes quite numer- 
ous, denuding whole canes of the currant and gooseberry 
bushes. When this is the case, the plant suffers greatly and 
we find that the injured canes do not produce fruit in the 
Fig. 14.—Grapta comma Harris. Original. 
following season. The parent of this thorny caterpillar is 
a very handsome butterfly (Fig. 14), also shown on plate II, 
Fig. 17. The wings are quite irregular in outline, having 
many projecting points and notches; they measure, when 
expanded, about one inch and a half. The surface of all four 
wings is reddish-brown, bordered on the outer edge with 
