38 SCIENCE BULLETIN, No. 19. 



It has the same fluted cotton on the hind portion of the body as /. purchasi, 

 but difiers in being smaller; " of a bright red colour, but covered with dots 

 and patches of cottony meal, which are often so thick as to hide the body 

 and make the insect appear to the naked eye quite white. Length of insect 

 one-tenth of an inch. The dorsal pencil, the ten-jointed antennae and the 

 very small ovisac of the adult female " (Maskell). One of the most notice- 

 able and constant characters is a distinct yellow tint in the cotton behind 

 which, formed like that of I. purchasi, makes the adult female considerably 

 longer than Maskell defines it. 



53. Icerya koehelei. Cat. Coccidse, p. 24. 



leery a hyperici, Froggatt (Fig. 23). 

 Agric. Gazette, N.S.W., vol. xxx, p. 472, 1919. 

 The young female is of a reddish yellow colour, clothed on the dorsal 

 surface with a pale yellow flocculent secretion, forming flufiy patches round 

 the outer margin and irregular tufts all over the back, interspersed with fine 

 scattered hairs. From the anal extremity projects a hair-like filament of 

 white secretion, up to a quarter of an inch in length. Length of coccid, one 

 twenty-fourth of an inch. 



The adult female varies in colour from a light orange yellow to a brick 

 red, but thickly covered with white mealy secretion, forming a marginal 

 fringe of woolly tufts and an irregular ridge of similar matter down the 

 centre of the back. Antennae and legs black. Length, slightly over one- 

 sixth of an inch. 



In general form this species is broadly oval, rounded on the dorsal surface, 

 with a well-defined marginal fold running round from the insertion of the 

 fore legs to the anal segment, ventral surface flattened. Both the dorsal and 

 ventral surfaces are clothed with fine scattered hairs, longest on the sides 

 and anal segment. The cephalic and thoracic segments are irregularly 

 wrinkled, with the first eight abdominal segments uniform in size, the anal 

 one rounded to the apex. The antennae are composed of ten joints, basal 

 ones broad, but of uniform length to the tenth, which is longest, oval «,nd 

 rounded to the extremity. Legs well developed, coxia short, thickened near 

 the apex ; femora rather short and thick set ; tibia small, slender, curved 

 and furnished with a strong curved tarsal claw. 



These coccids are very active, crawling all over the lower portions of the 

 twigs and roots. The species comes near Icerya nudata, Maskell, but the 

 structure of the mealy secretion of the female, the long single anal filament 

 of the young larvae, and the hairs round the margins seem constant and 

 distinct. 



