462 Mr. C Fuller 07i some species of 



coiinimnicates with the upper by a very small opening throu<^h 

 which, and the outer opening immediately above it, the 9 secretes 

 the glassy filament. The upper chamber usually contains several ^ 

 pupae, encased in white, mealy cocoons. 



On Melaleuca sp. Swan Hiver. This species is placed 

 provisionally in this genus, as all the species hitherto 

 described are from the Eucalypti and have single 

 chambered galls. 



Genus Cystococcus, gen. nov. 



Characters : — Gall inhabiting. Adult $ cyst-like, body 

 unsegmented, striated longitudinally. Legs and antennae 

 absent. Mouth almost obsolete. Spiracles large. Epi- 

 dermis without hairs, spines, or pores. Abdomen at the 

 end conical and capped with a hard chitiuous button, 

 which is used to close the entrance to the chamber of the 

 gall. Galls like those of the genus Apiomovpha, but of a 

 brittle nature, and with walls of an even thickness through- 

 out. The ^s probably undergo their transformations within 

 the $ gall, judging from the number of wings and remains 

 found at times in the galls collected. 



The genus is erected for the reception of a very remark- 

 able Coccid brought from East Kiraberley, North West 

 Australia, by Mr. Richard Helms. It is no doubt closely 

 allied to Ascelis, but both the Coccid and its gall are 

 sufficiently chai-acteristic to warrant the erection of a 

 new genus. 



66. Cystococcus echiniformis,s^. n. (Plate XV, fig. 86, a,h,c.) 



Adult $ almost spherical, and nearly filling the chamber of the 

 gall. Cephalic extremity flat ; abdominal conical, the apex termin- 

 ating in a hard, chitinised button. Body unsegmented, striated 

 longitudinally. Spiracles conspicuous, black, usually with white 

 filaments protruding from them. Mouth parts almost obsolete, form 

 doubtful. Legs and antennae absent. Length 0'5 to 0"7 inch. 



Larva unobserved. 



Gall spherical, orifice at apex. Diameter from | to 1 j inch. The 

 walls are of an even thickness throughout, comparatively thin, brittle 

 and granulate. Colour dirty white outside, the outer surface much 

 resembling a naked sea-urchin. The inner wall with a smooth 

 papery lining which is veined and bears a slight resemblance to the 

 inner wall of a sea-urchin. The chamber follows the contour of the 

 outer surface. Within, the entrance is surrounded by a wooden rim, 



