277 
A number of Psylla larvso produce galls, chiefly on the foliage of the Eucalypts. 
These are sometimes hard, woody galls, covering and often aborting the leaf attacked 
into a wrinkled woody mass, with the opening on the under surface of the leaf generally 
plugged up with a bit of waxy secretion to keep out intruders. Another forms thin, 
bladder-like galls upon the leaves, when the walls of the galls are as thin as the leaf, 
and in which the larva can move about. Sometimes these galls are brightly tinted 
with reds and yellows, but their general colour is that of their leaf." (Froggatt in 
Agric. Gaz. N.S.W., IX, p. 488, 1898). 
We are indebted to Mr. Froggatt for the best account of Australian Psyllidae. 
See his first paper under that title in Proc. Linn. Soc. N.S.W., XXV, 250 (1900). 
He says, " Many species form regular galls and blisters upon leaves, chiefly those 
of Eucalypts. These first appear as little pits, which swell into either bubble-like 
excrescences or thickened, rounded masses, enclosing the larva. This emerges from an 
opening either on the upper or under surface of the leaf. Others again hide under 
loose bark on the trunk or branchlets of a tree, enveloping themselves in a mass of 
flpcculent matter, which exudes and forms white spots, dotting the trunk all over. 
These species are so diligently looked after by several kinds of ants, which sometimes 
form galleries over them, that it is difficult to collect specimens. 
" Most of the naked species are more common upon Acacias and other scrub 
trees than upon Eucalypts, and swarm in such numbers on the under surface of the 
leaves or over the young branchlets as at first sight to be easily mistaken for aphides. 
" Some of the true lerp-producing species present very curious examples of 
insect architecture. 
" All the lerp-scales are fabricated by the larva? and pupae from the excess of 
sap or juice sucked up through their sharp bills from the food plant. This is ejected in 
small globules from the anus, but it is quite different from the excrement. It is another 
form of honey-dew, which, when drawn out into fine threads by the feet and spun into 
the net-like sugar lerps, solidifies and hardens in the sun." 
Under Sub-family Liviinae he enumerates : 
Creiciis longipennis Walker (p. 259). Forms a lerp on the leaves of Eucalyptus sp. 
Lasiopsylla rotundipennis Froggatt (p. 261). Forms a lerp on the leaves of 
Eucalyptus mettiodora (Melbourne), E. polyanthemos (Bendigo, Vic., and also Bathurst 
and Tumut, N.S.W.), and several other allied species. Lasiopsytta bullata Froggatt 
(p. 264). Forms bubble-like galls or excrescences upon the upper surface of the leaves, 
produced by the attacks of the larvae on the under surface. On E. capitcllata, Sydney; 
E. dives, Mittagong. I have received it from E. maculosa, Trunkoy (J. L. Boorman). 
Under Sub-family Aphalarinae, we have : 
Rhinocola eucalypti Maskell, described by Maskell in Trans. N.Z. Inst. XXII, 
160 (1889), with PI. X, figs. 3-16. Common on the foliage of E. globulus, growing in 
New Zealand ; also found by Mr. Froggatt on. seedlings in Sydney, see p. 267. R. revoluta 
F 
