272 THE ENTOMOLOGIST. 
Larva.—Anal segment: first subdorsal pair of tubercles 
shorter and set rather wider apart than those of edusa; the dark 
colouring above is smoky and suffused in hyale, which in edusa 
is sharply defined, angular and black; the general ground- 
colour of hyale is greener and darker than that of edusa. The 
main difference between the two species is not apparent until 
after the first moult, when the larva of hyale is covered with 
short blackish hair, edusa in the same stage being clothed with 
fine whitish pubescence. 
The ova are deposited singly in an erect position, mith 
the base terminating in a bulbous patch of glutinous substance 
firmly adhering to the leaf. The ovum is one-twenty-fourth 
of an inch high; the greatest.diameter is about one-third its 
height; in form it is elongate-ovate, attenuating at both ends, 
which are rounded ; just below the summit it is very slightly 
concaved ; there are from nineteen to twenty-two longitudinal 
keels, mostly running the entire length, but some originating 
at different intervals from near the summit to about one-third 
down; the spaces between the keels have a flattened surface, 
and are most delicately but irregularly ribbed transversely 
by about forty-six in number. The colour, when first laid, is 
a pearly yellowish white, which gradually deepens in colour ; 
when three days’ old the summit is transparent, white and 
glassy, shading into yellow for one-fifth down, where it deepens 
into clear rosy orange, which colour prevails over the whole 
of the median area, occupying three-fifths; the basal fifth is 
pale, similar to the crown, but not so transparent ; the colouring 
thus remains unchanged until about thirty hours before hatching, 
when it gradually becomes deeper, and finally turns to a purplish 
leaden colour, rather opaque; the shell has a very glittering, 
silvery appearance, and is exceedingly delicate. 
T am also indebted to Mr. F. W. Hawes for ova given me on 
September 22nd, which were deposited on the 20th. Thereby I 
have been enabled to note the change in colour from the 
beginning. He informs me they were precisely similar in colour, 
when first laid, to those of C. edusa. 
The first two eggs of those laid on August 29th hatched on 
September the 8th; the remainder hatched the next day, the 
ege-stage occupying about ten days. 
The larva makes its exit by eating a hole in the shell at the 
side near the crown. Soon after emergence it sometimes eats a 
portion of the shell. Directly after it emerges it measures one- | 
sixteenth of an inch in length ; the body appears to be perfectly 
cylindrical; the segments are transversely wrinkled, and the whole 
surface of the body is very finely granulated, each granule or 
wart being extremely minute and black; the ground colour is 
ochreous yellow; the black warts are so densely sprinkled over the 
surface that the larva appears of a dull olive hue; the head is 
