SCALE INSECTS ("COCCIDiE") OF AUSTRALIA. 63 



Genus XXXI. Bhizococcus, Signoret. 



Ann. Soc. Ent., France (5), vol. v, p. 36. 1875. 

 Maskell, Coccidce of New Zealand, p. 96. 1887. 

 Cockerel], Canadian Entomologist, vol. xxxi, p. 276. 1899. 



Though the original type for this genus was described by Dr. Signoret from 

 France upon the roots of a daphne, all the other species, with one exception, 

 are found upon the twigs and foliage, and fourteen of the sixteen listed are 

 described from New Zealand and Australia, while Green has recently de- 

 scribed two more from Australia. From a study of a good deal of live material 

 I think that vnth. further investigation several of the species described upon 

 the Casuarinas as distinct will be found at the least to be only varieties. 

 Maskell defines the genus as follows : " Adult female naked, usually station- 

 ary, body segmented ; anal tubercles conspicuous. Antennse of six or seven 

 joints. Feet present. Anogenital ring inconspicuous with fine hairs. Male 

 pupa enclosed in a cottony sac." 



Rhizococcus hicolor, n.sp. 



This species was collected upon the foliage of a myall {Acacia, sp.) by Mr. 

 L. J. Newman, at Dowering, Western Australia. 



Adult female blackish purple with yellowish markings, broadly oval, very 

 much wrinkled, and cleft on the under surface when resting on the fine branch- 

 lets; segmental divisions evidently well defined when alive. Length about 

 y of an inch. 



Antennse six- jointed, first short angulated, second shorter than third, 

 fourth shorter than third, fifth about the same length, sixth twice as long as 

 the last two combined; rounded at the extremity with scattered hairs on 

 sides. Legs stout, tibia slender, tarsus with four hairs on sides, digitules 

 long slender hairs curled and slightly thickened at the tips. Anal lobes 

 represented by two chitinous areas with a group of short blunt spine. Anal 

 ring large with six long hairs. Epidermis covered with circular pores and 

 short hair-like spines. 



Rhizococcus casuarinai, Maskell. 



Trans. New Zealand Institute, vol. xxv, p. 230, pi. xv, fig. 7. 1892. 

 The Entomologist, vol.. xxvii, p. 46. 1894. 



This coccid was found at Myrniong, Victoria, upon the branchlets of a 

 she-oak {Casuarina suberosa), and at Cheltenham, Victoria, on Casuarina 

 distyla (French). 



The adult female varies in colour from yellow to dark red ; the form normal, 

 with slight segmentation. Length about I of an inch. Antennae six-jointed, 

 of which the third is as long as the rest combined. Feet normal. Anal 



