43 6 Monophlebina:. 



(J)) Adult female with conspicuous, radiating, white, 

 waxy appendages : glassy filaments few. Ovisac 



relatively small and inconspicuous ccgyptiaca. 



B. Larger dermal pores ring-shaped ; with large, clear, 

 central area ; diameter greatly exceeding that of 

 the smaller pores. 

 {a) Antenna of adult female eleven-jointed. 



(a) Claw smooth ; larger pores conspicuously 



beaded ,... seychellarum. 



{b) Claw minutely serrate, larger pores not conspic- 

 uously beaded seychellarum nardl. 



(d) Antenna of adult female six- to nine-jointed pilosa. 



ICERYA PURCHASI, Maskell. 



(Plate CLXXX.) 



Tcerya purchasi^ Mask., N.Z. Trans. ^ Vol. XI. p. 221 (1878). 



This insect, having made its appearance in Ceylon since my departure 

 from the Island, I have had no opportunity of examining living material. The 

 detailed description given below, and the accompanying figures, were made 

 from specimens that had been preserved in alcohol. Many of the superficial 

 characters of the fresh insect have consequently been lost. Under these cir- 

 cumstances, I have resorted to the account of the living insect given by 

 Maskell in his volume on the Scale Insects of New Zealand. He there 

 describes the adult female as being ' dark reddish brown, covered with a thin 

 powdery secretion of yellowish meal, and with slender glassy filaments ; 

 stationary at gestation, and gradually raising itself on its head, lifting the 

 posterior extremity until nearly perpendicular, filling the space beneath it with 

 thick white cotton which gradually extends for some distance behind it in an 

 elongated ovisac, longitudinally corrugated ; ovisac often much longer than the 

 insect.' 



The attitude of the insect is depicted in my fig. i, which also shows the 

 characteristic fluted appearance of the ovisac ; but the long glassy filaments, 

 which gives to the living insect a conspicuously hairy appearance, have been 

 dissolved by the alcohol in which it was preserved. After complete denudation 

 the insect is seen to be strongly convex {fig. 2), rising— at the middle — into a 

 series of more or less prominent humps, which are accentuated by the presence 

 of dense tufts of stout blackish setas {see fig. 14). There are similar tufts of sets 

 surrounding the lateral margin of the insect, and the whole dorsal area is 

 thickly clothed with similar but rather shorter seta^. As in most other members 

 of this genus, each seta arises from a prominent tubercular base which is sur- 

 mounted by a translucent collar {fig. 12). Antenna {fig. 3) eleven-jointed ; 

 second joint cylindrical, third usually constricted about its middle, fourth to 

 tenth narrowed at base and expanded distally, the eleventh very irregularly 

 ovate. Limbs black ; well developed ; the tibia approximately as long as the 

 femur ; the tarsus half as long as the tibia, strongly bowed ; claw {fi^. 4) 



