PEAR AND CHERRY SAWFLY. 127 
The specimens of infested leafage sent me by Mr. Cresswell Ward, 
mentioned at p. 126, enabled me to watch the first part of the attack, 
which is so rarely recorded that I repeat it again. 
In this case the active stage of the attack to some of the leaves sent 
me was only just beginning, the upper surface of the leaf not being as 
yet stripped of the cuticle in patches, but dotted with little irregularly 
circular patches, some less than half a line in diameter. 
The places of egg deposit were very observable. These were 
noticeable on the upper side of the leaf as little spots, roundish in 
shape, and whitish in colour (from the upper coat of skin being dead), 
slightly raised in the middle, and of a somewhat transparent tint just 
over the contained egg, which was a soft mass, compressible, thick, 
and somewhat circular in outline. 
Most of the larve had hatched out, leaving only the white skin 
cracked where the maggot had effected its escape, but two eggs still 
remained unhatched. One of these eggs contained the white Sawfly 
larva curled on itself within, and sufficiently developed to be of char- 
acteristic shape, that is, with the large segments behind the head, and 
the hinder portion of the maggot with the segments much narrower. 
In the other egg the contents were not yet sufficiently developed to be 
defined in shape. I did not see any larve in the act of coming out 
of the egg, but the smallest of them were as a general thing of a 
yellowish colour. 
The little white blisters, or patches, of white dead skin covering 
the eggs were about one-sixteenth of an inch across, and on one leaf, 
where I counted them, over thirty in number; on another there were 
about twenty-five; all these (with possibly one exception) showing on 
the upper surface of the leaf.* 
Shortly after hatching, the grubs become covered with a blackish 
or dark greenish secretion, from which, and their lumpy shape (see 
figure, p. 125) they receive their name of slugworm. When carefully 
examined, they will be found to be much the thickest at the fore part 
of the body, and to have twenty-two pairs of feet, that is, three pairs 
of claw-feet on the three segments next the head, none on the fourth 
segment, and all the rest of the segments furnished with a pair of 
sucker-feet. The pair on the terminal segment are, however, so small 
that sometimes they have been overlooked, or not considered to exist, 
and the larva classed as twenty-footed. 
When full-grown, which is in five or six weeks, the slugworms are 
about five-eighths or half an inch long, and they then cast their bottle- 
green smooth coats, and appear as buff caterpillars, dry and free from 
all slime or shininess, and, instead of being smooth, transversely 
wrinkled. After this the caterpillars go down into the ground, where 
* See ‘Seventeenth Report on Injurious Insects,’ by E. A. Ormerod, p. 81. 
