136 Transactions.— Zoology. 
2. Rhizococcus fossor, sp. nov. 
Figs. 36-88. 
Adult female (fig. 36) greenish yellow in colour, sometimes brown, 
almost circular in outline, flat beneath and slightly convex above: length 
about 2, inch. In the last stage, after gestation it becomes dark brown. 
The cephalic part is smooth; the remainder segmented. The abdomen 
ends in two very small anal tubercles, which are nevertheless somewhat 
conspicuous on account of their brown colour. Between them there 
protudes a long thick pencil of white cotton, which is resolvable into six. 
Antenne (fig. 87) short, with six joints, the last joint bearing several long 
hairs. Feet very small; the femur rather thick: the tibia is shorter than 
the tarsus by about one-third: the four digitules are long fine hairs. The anal 
tubercles have not terminal sete; and I can only make out four hairs on 
the anal ring. A row of a few conical spines, set far apart, runs round the 
edge of the body, but I can see none elsewhere, nor any circular spinnerets. 
There is no sign of a sac in any stage. 
In the second stage the insect is oval, flatter than the adult, and of a 
rich golden colour: length about 3, inch. The segments of the body are 
somewhat more distinct than in the adult. The anal tubercles are pro- 
portionately larger, and bear terminal sete. Antenne longer than in the 
adult, with six joints. Feet also longer. All round the edge runs a row 
of conical spines, set more closely than in the adult; and from each of 
these springs a long curly tube of white cotton, making a kind of fringe to 
the body; each tube is a little dilated at the end, and then tapers to a narrow 
point (fig. 88). The base of each conical spine is a somewhat large tubercle. 
The young insect has the general form of the young Eriococcus hoheria : 
colour yellow; length about s inch. Antenne as in adult, with six joints. 
The feet are somewhat large. Anal tubercles thick, bearing a terminal 
seta and one shorter hair. Along the edge of the body is the usual row of 
conical spines, set somewhat far apart, and four other longitudinal rows are 
seen on the surface. The mentum is large and, I think, di-merous. 
This insect is viviparous. The females are often full of young larve, 
and, as these are born, they are sheltered in a cavity beneath the mother, 
as in some of the Lecanide. They do not remain there long, but soon 
begin their travels, and move rapidly. 
The male insect is red in colour, about +1; inch in length, undergoing 
its last transformation in a minute, white, cottony, oval sac. Antenne of 
nine joints: the first two short and thick, the third very long and slender, 
the fourth, fifth, sixth, and seventh about half as long as the third, thicker 
and rounder, the eighth rather shorter, and the ninth very short and 
nearly globular. All the joints have hairs. Legs slender: the tarsus 
