24 



SCIENCE BULLETIN, No. 18. 



Ctenochiton serrata, n.sp. 



This beautiful species was collected by Mr. L. J. Newman, on the leaves 

 of an undetermined species of Acacia, at Geraldton, Western Australia. 



Adult female reddish brown, flattened, elongate, oval, with the central 

 portio 1 showing a slight dorsal stripe ; anal cleft triangular with the extremi- 

 ties of the anal segment rounded and turning inwards. Length, } inch. 



The whole dorsal surface covered with chrystalline wax, produced in short 

 angular thorn-like plates; the central portion consisting of four parallel 

 rows of semi-transparent wax, with the outer margin fringed with a pro- 

 jecting rim of much larger angular plates of bright yellow wax. This wax 

 is easily removed with chloroform, leaving the naked, elongated, oval coccid 

 exposed to view. 



The male test is shaped like a slipper, rounded at the toe and truncate 

 at the hind margin ; the rounded dorsal surface covered with pale crystalline 

 plates of irregular shape, with the front and margins yellow, the former 

 covered with short waxy spines. 



Ctenochiton trans far ens, n.sp (Fig. 12). 

 This .curious species was obtained by Mr. L. J. Newman upon the foliage 

 of an undetermined species of Acacia, near Geraldton, Western Australia. 



The adult female is enveloped in an oval 

 rounded mass of pale yellow waxy matter, with 

 no apparent structure on the dorsal surface, but 

 on the margins against the leaf produced into a 

 fringe of irregular flattened angular plates, right 

 roimd the margin. Cleared of the waxy matter, 

 the female measures I inch in length ; dull yellow, 

 mottled with dark-brown; convex longer than 

 broad, with the cephalic region rather narrow in 

 front, and the anal segment contracted almost 

 into a peg at the extremity ; the dorsal surface 

 covered with irregularly rounded pits, forming 

 two parallel rows down the centre and a similar 

 band round the sides. Viewed from the imder 

 surface the coccid is dried up to a thin shell, and 

 might be likened to a dish cover with a tuft of cottony secretion occupying 

 the centre of the cavity. Short, stout antennse and small legs, very prominent, 

 standing out from the surface. Anal segment contracted; when treated with 

 potash shows each side forming a broad rounded tip. 



Treated with potash there appears to be no distinct structure in the epider- 

 mis ; antennae small, indistinct, legs small. 



Male tests composed of white crystalline wax, showing no defined plates on 

 the back, but produced into blunt spines in front and round the margin. 

 General form very much rounded, longer than broad, but broader in pro- 

 portion to length than usual; rounded in front, truncate behind. 



Fig. 12. Ctenochiton tmnsparens. 



