THE COCCIDAE OF SOUTH AFRICA. — III. 217 



The shape of the scale is broad, pear-shaped, much arched, broadly rounded in 

 front and suddenly narrowed a little behind the middle. The secretionary covering 

 easily flakes off and exposes the dense second skin, which is dull black, except 

 the margins and pygidial area which are deep red. When cleared and mounted 

 the second stage varies in length from 0'9 mm. to 1*5 mm. It is clear at the 

 margins and deep yellow to almost black in the centre, according to the degree 

 ■of chitinisation. It is broad oval, with the delicate pygidium protruding from 

 the hind end. 



The adult $, as seen within the second skin, is almost as long and broad, but 

 becomes narrower towards the pygidial extremity. The pygidial characters of 

 both second stage and adult $ are illustrated in fig. 138. The anal opening 

 is small, situated about twice the length of L x from the margin ; the vulva is 

 broad oval, rather more than twice as far back. Circumgenital glands 0. 



Habitat : On Rhus, in association with Aonidia badia, sp. n. On stems of Rhus 

 sp., Zeerust, Tvl, May 1915 ; collected by A. Kelly. 



Collection No. : 292. 



119. Aonidia badia, sp. n. (Plate xiv, fig. 139). 



Insect making pits in the thin stems of Rhus sp. 



Scale of adult $ almost circular, flat, about 1"2 mm. in diameter, consisting of 

 the thickened second stage plus a very thin, transparent layer of secretion, which 

 is only noticeable where it projects at the margins. 



The second stage $ is light chestnut-coloured. First exuviae present as a small 

 concolorous prominence near the anterior margin of the otherwise flat scale. When 

 the scale is removed it is found to be somewhat roundly convex below, completely 

 filling a circular depression in the bark, the scale usually lying flush with the 

 surrounding tissue on the top. The second stage $ appears circular, and is uniformly 

 chitinous to the position of the pygidial segments, where it is flatly concave. The 

 pygidium itself is not dense and is very inconspicuous until the specimens are 

 mounted ; it is often missing, because of its delicate nature, and when present, 

 the lobes and plates are often broken. Its typical characters are shown in 

 fig. 139. 



The adult $ is entirely enclosed in the second stage skin, but mounted specimens 

 have occasionally shown the pygidium of the adult $ protruding beyond the 

 split hind margin of the enclosing exuviae. The body is about 0'8 mm. long, 

 and 0'7 mm. wide, broadly rounded, hyaline, suddenly narrowed to the two 

 last free abdominal segments and with the pygidium narrow and pointed. The 

 antennal tubercles are large, with one very stout spine and a short, finger-like 

 protuberance. Parastigmatic glands 0. The pygidial margin has two pairs of 

 well-developed lobes ; L 1 large, long, tapering to the tip and once notched on the 

 outer sides ; L 2 small, steep on inner sides, but sloping backwards, with the curve 

 of the margin on the outer edge. The spines are a little longer than L 1( and 

 distributed as shown in fig. 139. The two conspicuous marginal openings have 

 slightly thickened edges, reminding one of Diaspidiotus. Circumgenital glands 0. 



