S2 SCIENCE BULLETIN, No. 18. 



Adult female pale yellow, with a greenish tint, when alive upon the foliage, 

 marked with reddish brown. General form, irregularly rounded, very much 

 flattened, thin, with the dorsal surface under the lens showing a delicate, 

 silver-tinted shagreened sheen; the cephalic portion furrowed with two 

 deep, widely separated, short, transverse lines ; the anal cleft long and well 

 defined. The immature females very thin, semi-transparent pale yellow. 



976. Paralecanium exfansum. Cat. Coccidse, p. 199, 



Lecanium filicum, Boisduval (Fig. 16). 

 Chennes filicum, Ent. Hort., p. 33.5. 1867. 

 Packard, llth Report Mass. Bd. Agri. p. 260. 1869-70. 

 Douglas, Ent. Month. M(uf., vol. xxiv, p. 28. 1887. 

 Maskell, Trans. N. Zealand Institute, vol. xxv, p. 220. 1892. 



This is the common fern scale, originally described from Europe, but novf 

 found in many parts of the world, having been introduced with cultivated 

 ferns in hothouses. It is common in the Botanic Gardens of Sydney upon 

 ferns. 



Adult female dull reddish brown ; treated with oil of cloves, it becomes 

 ^ich. golden yellow, with a few deeper yellow-coloured blotches in the centre, 

 and a dark band encircling the whole of the back, with a lighter coloured 

 margin. The whole derm is tessellated with small, irregularly separated 

 spots. 



General form that of Lecanvm olew, but smooth and more rounded, without 

 the keel or ridges, and of a lighter brown tint when on the food-plant. Douglas 

 says : " Female scale, short, broad-oval, very convex, smooth, with two 

 anterior and two posterior, slight blunt carinse going rather obliquely from 

 the back to the margin, thus interrupting the curve of the contour, and 

 sometimes two or three short and sharp vertical carinse at the sides joining 

 the margin, which is broad and flat. Antennae, eight-jointed, third longest; 

 articulation of tibiae and tarsi very distinct." 



Allied to Lecanium hemisphcericum, having a flattened margin, but dis- 

 tinguished by the carinse. Green considers it a smaller and more angular 

 form of L. hetmsphcericum, usually found on ferns. 



990. Saissetia filicum. Cat. Coccidae, p. 201. 



Lecanium frenchi, Maskell (Fig. 17). 

 Trans. N. Zealand Institute, vol. xxiii, p. 17, pi. iv, figs. 1-8. 1890. 

 Paralecanium frenchi, Cockerell and Parrott, The Industrialist, j). 227. 1899. 



The type specimens were found upon a honeysuckle {Banksia australis), 

 growing near Melbourne, Victoria. 



This is a very handsome, elongate, oval, broadly-rounded scale, slightly 

 convex; general colour, dark brown. The central part of the back is beauti- 

 fully tessellated, with the outer margin finely ribbed or ridged on the margin 

 along the sides, more irregular at the extremities. Diameter, | irch. These 

 details are brought out very clearly when treated with oil of cloves. 



