outer margins of the rings smooth to the tip ; the inner margins 

 are also smooth for about halfway, but those near the tip are 

 very sharply serratulate. Forewings hyaline, with a very minute 

 sparse punctuation and without marginal hairs ; the dorsal 

 margin (fig. 21, am h) is slightly concave in the middle, the 

 costal margin [a g e) is nearly regularly convex ; the primary 

 stalk of the veins (a h) extends to nearly one-third of the wing ; 

 the cubitus (h e, h k) has no stalk, forking directly with the sub- 

 costa (at b) ; the upper branch of the cubitus (6 e, h h) is convex, 

 forking near the apex, the terminal branches reaching the margin 

 at about equal distances from the apex ; the lower branch forks 

 near the dorsal margin with one short branch (to m) and one 

 longer and convex (to k) ; the radius {df) is very slightly wavy, 

 and leaves the subcosta (h g) at about half the length of the latter ; 

 the clavus {a n) is nearly straight ; the costal vein {ag eh n) runs 

 all round the margin. The hindwings are hyaline, with three 

 faint longitudinal veins, of which the posterior one is forked. The 

 genitalia of the male have the usual dorsal processes ; the genital 

 plate (a) is broad at the base, with slightly emarginate tapering 

 sides ending in two divergent sub-conical teeth ; the forceps (h) 

 is somewhat similar, but narrower, and is bent forwards almost to 

 the plate. 



The length of this insect is about 2 mm = yV inch, with an 

 expanse of wings about 5 mm. 



Habitat. — In Australia, on various species of Eucalyptus ; 

 principally, I believe, on what is known as ^^ Stringybarky Mr. 

 Tepper sent me specimens from Marino, South Australia ; Mr. 

 Froggatt, from New South Wales ; Mr. French, from Victoria ; 

 and Mr. H. S. Dove, from Tasmania. 



The generic position of this insect is clearly defined by the 

 ■character of the wings, which are quite normal of the genus 

 Trioza, Specifically, it may be distinguished by the genitalia of 

 the female, which seems to be different from any hitherto re- 

 ported, as well as by the character of the galls which the pupae 

 inhabit. Psyllidse, as has been found of late years, are almost 

 as varied as Coccidse in their ways of covering themselves ; and 

 this seems to be especially the case with the Australasian forms, 

 for I do not find that Low and Scott or Riley draw particular 

 attention to this point respecting Psyllidse of other regions. In 

 this part of the globe, however, we have some uncovered {e.g. 

 Rhinocola fuchsioe in New Zealand), some with cottony secretion 

 (as Rhinocola eucalypti in N.Z.), some excavating pits for them- 

 selves (as some undetermined Australian forms), some forming 

 elaborate waxy tests of elegant design (as the species described 

 from Tasmania by Dobson in 1850 and others not yet fully 

 worked out), and some again, such as the one now under dis- 



