64 SCIENCE BULLETIN, No. 18. 



tubercles hidden before treatment with potash. Dorsum bearing some 

 slender spines, some of which are very long. Maskell says : " This is another 

 species allied to R. grandis, but it appears to difier from that sufficiently in 

 the antennae, and principally in the rows of very strong spines on the dorsum 

 of the larvae." In his plate he figures the larva. 



261. Rhizococcus casuarincR. Cat. Coccidae, p. 66. 



Rhizococcus grandis, Maskell. 

 Trans. N. Zealand Institute, vol. xxiv, p. 29, pi. vi, figs. 1-2, 1891, vol. xxv, p. 230. 1892. 



This is an underground species found upon the roots of a wattle {Acacia 

 longifolia) in Victoria. 



Adult female dark red, naked, convex, and subglobular in form, with dis- 

 tinct segmental divisions. Maskell says : " This very large insect has much 

 the appearance to the naked eye of Coccus cacti (the cochineal insect), being 

 very much the same size and colour. Length about i of an inch. 



Antennae composed of six joints, the second longest, first, third, and sixth 

 shorter about the same length ; fourth and fifth the shortest ; on the ter- 

 minal one, several short hairs. Feet slender, tibia with spine, upper digitules 

 fine hairs, lower pair slightly dilated. Anal ring with eight hairs, on the 

 dorsum scattered slender hairs." 



Maskell described another form from the same locality on an allied wattle 

 {Acacia implexa), which he called var. spinosior. The differences were the 

 more numerous dorsal spines and the lower pair of digitules more dilated. 

 He does not state in his descri})tion if this variety is a subterranean one like 

 R. grandis. 



265. Rhizococcus grandis. Cat. Coccidae, p. 66. 



Rhizococcus lecanioides. Green (Fig. 46). 

 Bull. Entom. Research, vol. vi, pt. i, p. 47, fig. 4. 1915. 



This curious species is found upon the branchelts of a she-oak {Casuarina 

 distyla) at Sandringham, Victoria (French). 



Adult female dark brown; smooth, without any defined segmentation, 

 variable in form, convex and pear-shaped; others shaped like small cowrie 

 shells, with the margin of the under-surface curled on to the branchlets. 

 Antennae and legs very small; the joints of the antennao very indistinct, ap- 

 parently six- jointed, third longest. Tarsus very long. Anal lobes large, 

 prominent, chitinous and wrinkled, with a short seta on each lobe. Derm 

 without spines, but thickly set with small oval chitinous lenticels. Anal 

 ring with eight stout setae. Length about yV of an inch. (Abridged from 

 Green's description.) 



