228 Transactions.—Zoology. 
*  Cocomæ.—Plate VIIL, figure 19.—Coccwz. 
ig. a, Dactylopius calceolarig: female; magn. 20 diams, 
” za antenna: magn. 60 diams. 
" 4 foot: magn. 60 diams. 
? , 
Dactylopius poe : antenna magn. 60 diams. 
S magn. 60 diams. 
g, "T 5 ae region: magn. 200 diams. 
Coccrpz.—Plate VIIL, figure 20.—Coccrpz. 
Fig. a, Icerya purchasi: young insect: magn. 40 diams. 
b, p sr female, 2nd stage: magn. 20 diams. 
«B c ^t hairs and spinnerets: magn. 200 diams, 
d " antenna, 3rd stage: magn. 40 diams. 
ONDE ii foot, 9rd stage: magn. 90 diams. 
* cw * antenna of young: magn. 90 diams. 
occip#.—Plate VIII., figure 21. 
Fig. a, —-— purchasi : female, commencement of last stage, viewed from above: 
6 diams. 
b, Nye Mie: ditto, under side; magn. 6 diams 
Q, k xi female, end of last stage: magn, 6 diams, 
d... » ditto, under side, 
Coccrp x.—Plate VII., figure 22, 
Fig. a, Powellia vitreo-radiata ; eggs: magn. 150 diams. 
b 
’ " > female: magn. 25 diams. 
Cy: os " abdomen of young: magn. 90 diams. 
& y " antenna: magn. 100 
e, » i foot: magn. 200 diams. 
5h » anal marking; magn. 200 diams, 
8; n 5 fringe: magn. 200 diams, 
Art. XVII.—On a Hymenopterous Insect parasitic on Coccide. 
By W. M. Masxeut. 
[Read before the Philosophical Institute of Canterbury, 4th July, 1878.] 
: Plate IX. 
Some of the Coccide are much troubled by parasites. In this country I 
have not found this to be the case upon the naked-bodied species, Lecanium, 
ete. But some of the Diaspidz, particularly Mytilaspis pomorum, have often 
in their shells minute white Acari; and as in these cases many of the 
enclosed eggs have been shrivelled or empty, I imagine that the Acarus may 
devour them. 
The insect I am now describing attacks some of the indigenous test- 
bearing Coccide. When in June, 1877, I found my first specimens of 
Ctenochiton perforatus, Y did not at first understand the nature of an object 
