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cork-tissue to surround and close off the injured part from tho rest of the leaf. The 
phenomenon has been noticed both in the longest leaves and also in the small mature 
leaves, and gives the leaf an undulate appearance, while the margin becomes irregularly 
toothed, as shown on 96 and 9c of Plate 81 of my " Critical Revision of the Genus 
Eucalyptus." Mr. Froggatt is of the opinion that the insects responsible belong to 
the family Cvreidecc (Gum-tree Bugs), or the family Cercopidcr (Frog Hoppers). 
The phenomenon has also been noticed in Eucalyptus r.ernicosa and E. incrassata 
var. angulosa, and doubtless observation will lead to its being found on many other 
species. 
Family Membracidae (Tree Hoppers). 
This group is chiefly confined to the tropical parts of the world. Reference 
may be made to " A Monograph of the Australian Membracidae," by F. W. Goding, 
Proc. Linn. Soc. N.S.W., XXVIII, 2 (1903), with a Plate. Most of the food plants 
appear to be Wattles, and Dr. Goding quotes with approval Mr. Froggatt' s " Insects 
of the Wattle-trees" (Agric. Gaz. N.S.W., XIII, 701, 1902), for a not 3 on their life- 
history. EufnggaUia luberctdata is a raie insect, usually found resting on a twig of a 
Eucalyptus sapling (Froggatt. p. 358). 
Family Jassidae (Leaf Hoppers). 
A very pretty little unidentified species, bright-red and yellow, with the fore 
wings marked with dark brown, is common upon the broad soft leaves of Eucalyptus 
robusta, where the curious little larvae rest in families of three or four. The larva) of 
another species have been observed to form large colonies on the surface of the leaves 
of low Eucalyptus bushes on the hills near Capertee, N.S.W. They suck up the sap, 
discolouring the centre of the leaves (Froggatt, p. 361). 
Family Psyllidae (Lerp Insects). 
See Frogatt, p. 361. These have been dealt with, to some extent, at p. 113, 
Part LXIII of the present work. Following is a list of the sub-families which affect 
Ew-dyptm, with the genera in brackets : 
1. Sub-family Liviiiwe (Crewiis, Lasiophylla). 
2. Sub-family Aphalarinae (Aphalaria, Cardiaspis, ComelopKytta, Dasypsylla, 
Rhinocda, Spondyliaspis , TJiea. 
3. Sub-family Psyllinae (Eriopsylla, Eucaltjptdyma, Psytta. 
4. Sub-family Triozinae (Trioza). 
These are popularly known as " lerp or leaf-manna " insects, from the habit 
that many of them have in the larval state of protecting themselves with a scale-like 
covering, composed of their surplus food, attached to the leaf by a hinge, under which 
they feed until ready to change into the perfect insect, which is very like a cicada in 
miniature, but furnished with hopping hind legs, with which they can spring to a 
considerable distance when disturbed. 
