ASPIDIOTUS ZONATUS. 95 



orange yellow. Form and colouring of secretionary 

 covering uncertain, as it invariably disappears in the 

 old examples. The old scales become so covered with 

 a sooty deposit as to render their colour perfectly 

 obscure ; the only recognition mark being the minute 

 orange -coloured larval exuviae. The ventral surface of 

 the puparium is greyer, and the larval exuviae brighter. 

 Ventral scale a thin powdery secretion, forming con- 

 spicuous white circles on the bark (PI. VI, fig. 9). 



Diameter '75 1*75 mm. 



Adult female (PI. VI, fig. 3) widely ovate, almost 

 circular, and shrivelling after gestation. Pygidium well 

 defined and projecting. Colour clear, bright, yellow ; 

 margin of pygidium darker, or orange brown. After 

 treatment with potash the insect assumes a more regular 

 ovate outline, the pygidium taking the same contour as 

 the body. Cephalic area with many slender hairs and 

 several shorter ones irregularly placed along the margin 

 at the sides of the body. Rostral filaments more than 

 twice the length of the mentum. Free abdominal seg- 

 ments, with several tubular spinnerets connected with 

 marginal pores. Pygidium (PL VII, fig. 1) broad and 

 comparatively short. Subdorsal groups of tubular 

 spinnerets moderately short ; connecting dorsal pores 

 in a short double series ; the outer series irregularly 

 alternate. Vaginal opening a little beyond the centre. 

 The anal opening nearly half way between the apex 

 and vaginal opening. Circumgenital glands in four, 

 or rarely five groups ; the anterior group of from 

 1 4; the anterior laterals from 8 14; and the pos- 

 terior laterals from 6 11. The following formula of 

 twelve examples are from a single colony of females : 



000 00 



108 . 1110 . 910 . 1413 . 910 . 1110 



97 . 810 . 8 8 . 7-- 8 . 6 6 . 8-- 7 



00 1334 



1111 . 1011 . 1011 . 129 . 1413 . 1012 

 10_ 9 . 1Q_ 7 . 810 . 88 . 911 . 911 



