BV WALTER W. FROGGATT. 33! 



This appears to be one of the commonest gall-prod ucin<»- species- 

 in Tasmania. I have had a number of specimens all on the 

 same species of slender-leaved " Mallee Gum." The galls are 

 produced by the larva? attacking the upper surface of the leaves, 

 which become thickened, little circular rosettes forming round 

 each larva; these swelling out, side by side, often coalesce and 

 cause the infested leaf to curl right round into an aborted mass, 

 carrying from two to thirteen which when crowded together are 

 much smaller than isolated specimens which measure uj) to 2 lines 

 in diameter at the base and 2 lines in height. The basal attach- 

 ment to the leaf is circular, flattened on the under surface of the 

 leaf, the apical portion bearing a circular boss in the centre 

 surrounded with a number of irregular, truncate, fleshy tubercles 

 or fine finger-like projections, forming a rosette-like structure. 

 The enclosed chamber is of an irregular rounded form, smooth, 

 shining, with a conical point at the apex below the button. The 

 galls split on the upper surface when the enclosed pupa is ready 

 to make its final pupation and come forth as a perfect insect. 



Trioza dobsoni, n.sp. (Plates iv., fig. 11; v., fig. 15). 



Pupa black on dorsal surface, with lines on head, thorax and 

 segmental divisions of abdomen reddish-brown; antenna? and legs 

 fuscous, eyes dark brown, ventral surface light reddish-brown. 

 The short, broad, cephalic portion enfolded on the sides by the 

 thoracic shield, with a dorsal stripe down the centre of both; 

 w4ng-covers only swelling out towards base of abdomen, the latter 

 rounded to apex. The whole forms a broad, convex shield, 

 fringed with short semitransparent spines, and lightly clothed 

 with white floury dust. 



Imago. — Length 0*075 inch, antenna^ [?]. General colour 

 dark chestnut-brown, with stripes and bars of light brown on 

 dorsal surface, wings semitransparent, nervures brown. Head 

 longer than usual in proportion to width, flattened on either side 

 of median suture, deeply arcuate behind, arcuate in front. Face 

 lobes large, broad, rounded at tips. [Antenna' wanting]. Eyes 

 large, projecting, rounded on outer edges; central ocellus at apex 



