THE COCCIDAE OF SOUTH AFRICA — II. 113 



The surface of the gall may be chipped off with the point of a knife, exposing the 

 yellow adult $ below (figs. 756, 75c). The inner surface of the gall is regularly domed, 

 and the orifice is generally closed from within by what appears to be the cast skin 

 of the immature $. 



Adult $ about 1.25 mm. in diameter, pale yellow in colour, irregular and wrinkled. 

 When cleared and mounted the insect appears as a hyaline sac with mouth-parts 

 and anal ring only conspicuous. The antennal tubercles are small, with 3 curved 

 spines (fig. 79a). Figure-8 glands absent. Simple glands moderately numerous, 

 chiefly in irregular transverse rows near posterior end. Anal ring small, with 6 hairs. 

 Caudal lobes obsolete, but marked by a pair of long stout bristles, which are rather 

 more than twice the length of those of the anal ring (fig. 79). Mouth-parts 

 comparatively small. 



Habitat : Causing flat galls in stems of Acacia sp. ; collected by writer, Pretoria, 

 19th September 1914. 



Collection No. : 299. 



Sub-family Conchaspinae. 

 This sub-family comprises very few species, all of which belong to one of the two 

 genera Conchas-pis and Fagisuga. Only the former is represented in South Africa, 

 and that by one species. 



The characteristics of the Conchaspinae may be briefly stated as follows : — 

 Anal ring hairless ; legs and antennae present ; adult females beneath a separate 

 covering scale, which is composed entirely of secretionary matter without the 

 admixture of exuviae. 



Genus Conchaspis, Ckll. 

 Conchaspis, Ckll., Gard. Chron, (3) xiii, p. 548, 1893 ; id., Jn. Inst. Jamaica, I, 

 p. 256, 1893 ; id., Bull. Bot. Dept. Jamaica, p. 101, 1895 ; Green, Cocc. Ceylon, 

 i, p. 19, 1896. 

 Pseudinglisia, Newst., Ent. Mo. Mag., xxix, p. 153, 1893. 



Scale + circular, moderately convex, smooth or slightly ridged. Adult $ retaining 

 legs and antennae. Antennae of few (3 or 4) segments. Terminal segments of 

 the abdomen + united into a pseudo-pygidium, which usually has long hair-like 

 spines but no definite plates (figs. 80 c,81). In the type species of the genus Fagisuga, 

 F. triloba, Ldgr., there are several stout spines and three broad plates with saw- like 

 margins (fig. 83). 



68. Conchaspis euphorbiae, sp. n. (Plate v, fig. 81). 



Female scale large, reaching 6'5 mm. for its greatest diameter, average size about 

 5 mm. ; nearly circular, sometimes slightly elongate, moderately arched. Colour 

 white, but appearing greyish owing to the presence of small dark particles incor- 

 porated in it, especially at the margins of the component lamellae. The scale is 

 somewhat flattened on top, where it usually presents a + irregular, central, yellowish 

 projection surrounded by a concentric ring. In texture the scale is compact, the main 

 dome being slightly roughened above and white and shiny beneath. The small 

 male (?) puparia found beneath the large main scale are white, broadly oval and loose 

 and floceulent in texture. Large numbers of scales are often aggregated into masses 



