324 Transactions. — Zoology. 



Adult female and larva not differing appreciably from the 

 type. The larva may be a very little smaller, but is otherwise 

 identical, and as the adult has no organs whatever for com- 

 parison it may also be taken as identical. 



Male unknown. 



Hab. In Western Australia, on an unknown plant with 

 small but broad leaves and clusters of small white flowers. 

 My specimens were sent by Mr. Lea, from Albany. 



The only difference which I can detect between this and 

 the Mount Barker insect is the more elongated form of the 

 gall ; and the absolute similarity between the larvte is a very 

 strong indication of specific identity. 



Sphaerococcus pulchellus, sp. nov. Plate XXI., figs. 10-13. 



Adult females covered by a waxy test, which is of a very 

 pale-yellow or buff or whitish colour. The form of this test 

 is peculiar, and it is difficult to describe it in words ; the figure 

 which I give of it will best exhibit it. It is very convex, and 

 is attached to a twig, either singly or in clusters, by an ellip- 

 tical base, from which the sides swell upwards and outwards, 

 with broad and shallow corrugations, like the two parts of a 

 bivalve shell, not quite meeting at the top, but leaving a longi- 

 tudinal slit through which may be seen an inner shell of the 

 same material ; sometimes this slit is very narrow, and the 

 sides seem to touch, but a slight pressure shows that they are 

 separate. In the great majority of specimens there is also 

 another transverse groove, wider than the longitudinal one, 

 but this is absent in some. On the whole, the test looks as if 

 it were double, with the outer part cleft in two directions, but 

 it is not easy to give an idea of its peculiar form in words. 

 The average length of a test is about -j^i^-' ^^^^ some speci- 

 mens reach Ain. 



The test of the second stage is not unlike that of the adult, 

 but whiter in colour and less solid. 



Test of male pupa not observed. 



Adult female subglobular, black in colour, filling the test. 

 Antennae and feet entirely absent. Mentum conical, mono- 

 merous. Dorsal epidermis covered with many small tubular 

 spinnerets, which are most numerous near the margins, and 

 along the margin runs a broad band, apparently chitinous, in 

 which are large numbers of oval marks, each having a small 

 circular orifice in the centre ; towards the abdominal extremity 

 there are three of these bands. 



In the latest second or earliest adult stage the insect is 

 similar to the adult, but smaller. Eemains of antennae and 

 feet may be detected. The tubular spinnerets are more 

 numerous, but the marginal bands have not yet aj)peared, nor 

 the oval pores. 



