62 E. ERNEST GREEN, 



Pygidium (fig. 8, d) rounded, with four acutely pointed prominent lobes, of which the 

 median pair are lanceolate and the laterals conical. Squames long and deeply 

 fimbriate. There is a very delicate prominent pointed process immediately beyond 

 the outermost squame, on each side, which is obsolescent in older examples. Circum- 

 genital glands in three groups : median group 20 to 25, laterals 7 to 8 ; small 

 supplementary groups (of 3 or 4 pores) on each of the two preceding segments. Oval 

 dorsal pores numerous, scattered. There are two transverse series of irregularly 

 quadrate or triangular thickened patches across the hinder half of the pygidium. 

 Length of extended insect 0"75 to 0*85 mm. ; after gestation 0'5 mm. 



On foliage of Fiais orbicularis, Darwin, N.T. (Hill, 23, 25). 



Differs from the type in its smaller size. Nymphal pellicle more strongly 

 granulose : its pygidial lobes more deeply cleft. The ventral series of conical points 

 more extended. Posterior margin of adult female with longer and more deeply 

 fimbriate squames. 



Fiorinia acaciae, Mask. 



On Acacia sp., Darwin, N.T. (Hill, 634). 



This appears to be a remarkably variable insect, as may be seen by reference to the 

 figures (fig. 9, a-h), which represent variations of the posterior margin of the adult 

 female. The figures are all drawn to the same scale (magnified 450 diameters). 



"^^ .. 



y^ - - / 





e \^ ■ f 



Fig. 9. Fiorinia acaciae. Mask. ; a-h, various forms of median 

 lobes on pygidium of adult $, X 450. 



Extreme forms might be mistaken for distinct species, but intermediate forms occur, 

 often in the same gathering. Forms a, e, and h, for instance, all occur in a small 

 gathering from Somerville, Victoria. Maskell, in his diagnosis of the species, describes 

 " a single median floriated lobe." I have seen no examples in which the lobes are 

 actually united, except an aberrant and asymmetrical specimen showTi at h. In the 

 form b, which otherwise answers closely to Maskell's description, there is a distinct 



