BY WALTER W. FROGGATT. 277 



The larvfB produce thick fleshy soft galls of a regular oval form 

 upon the leaves of several species of Eucalypts, measuring up to 

 8 lines in height and 5 in diameter at the centre, narrow and 

 constricted at the base, brightly tinted with green and red when 

 occurring in exposed positions; sometimes single, but generally 

 in groups of two or three in contact with each other. The larva 

 attacks the leaf from the undersurface, but unlike the " bubble 

 galls," the scar heals up, and as the gall increases in size it cracks 

 at the apex, forming an irregular slit opening into a tubular 

 chamber, in the centre of which is to be found the larva attached 

 by its rostrum to the bottom of the chamber, but easily detached. 

 When full grown the psyllid casts its pupal skin and emerges 

 through the top of the gall. 



This is a widely distributed species, forming galls on several of 

 the thick-leaved Eucalypts, but about Sydney chiefly upon E. 

 capitellata. The insects are very variable in colour and size, the 

 females being much bigger than the males. I have placed speci- 

 mens received from Tasmania with our own specimens, as the 

 galls are exactly alike and the general structure seems to agree, 

 though the perfect insect is much larger. 



Trioza eucalypti, n.sp. 

 (Plate xvi., fig. 23.) 



Larva. — General colour ochreous on dorsal surface floured 

 with white dust which forms white filaments round the outer 

 edge beneath which is an unbroken fringe of short spiny hairs; 

 eyes dark reddish-brown ; ventral surface covered with floury 

 secretion; head, thorax and legs ochreous; abdomen pale green. 

 General form flattened and shield-shaped above. Antennae short, 

 thickened at base, curling round like a sheep's horn; legs stout, 

 thick, with large tarsal claws ; ventral surface swelling out, 

 corrugated; abdomen convex and globose. (When the larva is 

 removed from the gall it turns the abdomen up when crawlin 



Pitpa not differing from full-grown larva. /^O^ L^ / 



Imago. — Length 01 15, antennae 004 inch. A^ o^^ ^o -^ 



ujlLIBRARY a 



A S3; 



