Maskell. — On Coccididse. 33 



Dactylopius acacise, sp. nov. Plate VI., figs. 15, 16. 



Adult female very dark-purple or dull intense black ; aggre- 

 gated frequently in masses on the plant, with small quantities 

 of white cotton : insect subglobular, segmented : length about 

 ^igin. Antennae rather long, with seven jomts, subequal ex- 

 cept the last, which is large and fusiform, and bears several 

 hairs. Feet rather long and strong : the digitules are all fine 

 hairs. Anal tubercles very short and inconspicuous, with, on 

 each side rather higher up, two smaller lobules : all the six 

 bear a number of short, rather strong spines, and on each of 

 the median tubercles is a longish seta. Epidermis covered 

 with great numbers of circular spinneret-orifices, which are 

 most numerous near the margins ; interspersed with spines 

 and some longish fine hairs. Anogenital ring with six hairs. 

 Mentum trimerous. 



Larva and male not observed. 



Hah. In x\ustralia, on Acacia linearis and Acacia lo- 

 pkantlia : several specimens from Mr. French. 



The differences between this species and the two last de- 

 pend not so much upon its size and the character of the 

 cottony envelope as upon the minute features just described. 

 It might, indeed, at first sight be taken almost for a small 

 form of D. albizzice ; but the six abdominal lobules and the 

 antennas and feet separate it from that species. 



Dactylopius iceryoides, sp. nov. Plate VII., figs. 1-5. 



Adult female light-brown, with transverse darker streaks, 

 and powdered over with yellow or buff-coloured meal ; resting 

 on a thick cushion of yellow cotton, in which it is partly im- 

 bedded, and frequently only attached to the plant by the 

 cephalic extremity, the remainder being raised up by the mass 

 of cotton beneath. Form elongate-elliptical, distinctly seg- 

 mented, very convex ; the dorsum frequently elevated in a 

 distinct longitudinal ridge. Length variable : some specimens 

 observed reach nearly lin., the accompanying mass of cotton 

 being as large as a pea. Antennas of eight joints, the first two 

 larger and rather longer than the next five, which are sub- 

 equal ; the last fusiform, as long as the first two together, and 

 bearing some hairs at the tip. Feet rather strong, normal. 

 Mentum dimerous. Anal tubercles very small, inconspicuous, 

 setiferous, borne upon small wide lobes, which bear a few 

 spines. Anogenital ring with six hairs. Epidermis bearing 

 numbers of very small circular spinnerets, which are most 

 numerous near the margins, interspersed with fine spiny hairs. 



Female of second stage dark-red, with a quantity of white 

 or yellowish cotton round the edge, and also some on the 

 dorsum ; form elliptical, slightly convex ; very active : length 

 about r^in. i\.ntenn£e rather thick, with seven joints, all sub- 



