216 CHAS. K. BRAIN. 



tapering to the hind margin, which is pointed. The margin is broadly crenulate, 

 indicating "nine regions or segments, of which the fourth from the front is the widest. 

 The pygidial margin as illustrated (fig. 137). 



The adult $ is about 1 mm. long, long pear-shaped, hyaline, sharply tapering 

 behind. The antennal tubercles are small, conspicuous, with one long, straight 

 nagellum. Parastigmatic glands 0. The pygidium has two pairs of lobes ; L x 

 are long and straightly notched on each side ; L 3 much smaller, often slightly 

 notched on the outer side, but in some cases quite rudimentary. Circumgenital 

 glands 0. 



Habitat : On Rhus sp., Cape Town ; collected by C. Fuller, 1898 (Cape No. 1251). 



Collection No. : 289. 



117. Aonidia mesembryanthemae, sp. n, (Plate xiv, fig. 136). 



Insects making pits in the fleshy leaves of the host-plant, around which the tissues 

 often thicken to form rounded mounds with the scale in the central depression. 



The dorsal scale of the adult $ is about 1"5 mm. long and 1 mm. broad, white, 

 thin, translucent, very delicate, with the buff-coloured larval exuviae central. As 

 the second stage ^ develops it appears as a dark brown to black mass beneath the 

 dorsal scale, with paler margins, ultimately reaching approximately the size of 

 the dorsal scale. At this stage the scale appears black or greyish black, according 

 to whether the dehcate dorsal scale persists or not. 



Adult $ pale yellow, broadly rounded, with very narrow pygidium. Posterior 

 portion of body conical, filling the depression below the scale. Adult $ apparently 

 not enclosed in the second exuviae, but completely covered by them. Ventral scale 

 complete but very delicate, white. 



The puparium of the $ is about 1 mm. long, slightly more elongate and more 

 convex than the female scale, white to buff in colour, with yellowish larval exuviae. 



The second stage $ attains a length of 13 mm. and a width of 0"9 mm. The 

 integument becomes densely chitinous and dark brown to black. When boiled 

 in KOH and mounted the margins are light in colour, almost hyaline, but the 

 median area is deep brown. The margins are more regular than in any of the 

 other five species found in this country, and the body is more regularly egg-shaped. 

 The pygidium is dehcate, and scarcely produced from the general body outline. 

 Segmentation obscure. The pygidial characters are illustrated with those of the 

 adult 9 (fig. 136). 



The adult is smaller, about 1'8 mm. long, pear-shaped, with the posterior 

 extremity pointed. Tbe whole body is delicate and hyaline when mounted. The 

 pygidial characters as illustrated (fig. 136). Circumgenital glands 0. 



Habitat : Making pits in the fleshy leaves of Mesembryanthemum edule, Natal 

 Coast, Cape Province, etc. 



Collection No. : 290. 



118. Aonidia marginalis, sp. n. (Plate xiv, fig. 138). 



Scale of adult $ about 15 mm. long, composed of large second exuviae, with 

 a thin layer of buff-coloured secretion. Exuviae often showing through, black. 



