Tlie Coccidae of South Africa. 
95 
This is a very distinct species. The only other described insects 
belonging to the genus are : — Tylococcus madagascariensis Newst., 
T. cycliger (Leonardi), and T.insolitus (Green). A variety of Pseudococciis 
stelli sp.n. has been described under the name var. tylococciformis var. n. 
in this paper, but I am not yet decided as to exactly what relation it bears 
to that species. 
Collection Nos. : 44 and 61. 
6. Tylococcus insolitus (Green). 
Phenacoccus insolihis Green, Mem. Dep. Agr. of India, II., 2, p. 26, 1908, 
Plate iii., Fig. 10. 
Ovisac : White, elongate when complete, extending below and behind 
the adult $ . In texture it is coarsely fibrous, composed of white cottony 
matter with coarse glassy filaments intermixed. Length when complete 
about 2 mm. ; width about 1 mm. ; upper suface slightly rounded. 
Ova : Pale creamy or greenish-white ; slightly farinose, about 0-33 mm. 
long. 
Larva : Pale yellowish or greenish-white in colour, with 4 distinct, 
large, black dorsal dots. Margin with fringe of delicate glassy filaments, 
which remind one of Ps. virgatus Ckll. 
Freshly mounted in balsam 0*4 mm. long ; antennae 6-segmented. 
Marginal and dorsal tubercles conspicuous ; eyes distinct, with a small 
black mark below each. Anal ring large, with six hairs. Marginal 
glassy filaments arise from the stout spines of the rounded tubercles. 
Adult 2 '■ About 1*5 mm. long and 1 mm. broad, pale greenish-yellow 
with black dorsal markings. When seen under a pocket lens there is a 
central black dot, and usually five others surrounding this about half-way 
between the central spot and the margins. Two of these are towards the 
anterior end and three posterior. On the dorsum and margins are 
numbers of relatively stout glassy filaments. Examined under a low 
power it is seen that these filaments arise from rounded tubercles, and are 
secreted from stout conical spines, the number of filaments varies with the 
number of spines ; there are usually from four to twelve radiating from the 
same protuberance. 
Instead of caudal filaments there are two comparatively short, dense, 
wide plates, more or less curved and compressed at the base, curving out- 
wards, in some cases, like a vase. Insects when dead and rubbed dark 
purple-brown. 
In boiling KOH the colour becomes brownish-red, but does not stain 
the hquid. 
When cleared, stained, and mounted the insects average 2 mm. in 
length. The most striking feature is the presence of the numerous large 
