The antennæ of the adult female have six or seven joints. It is often very difficult to determine the number, as the third joint exhibits frequently a shallow circular depression or ring which may easily be mistaken for a division. During gestation the female, which at first fills the test, shrivels up at one end into a shapeless mass requiring maceration in potash to restore the original form for examination. The test thus becomes almost filled with eggs. The presence of the fringe, which is noticeable in every species of this genus at some time or other, distinguishes it from _Ceroplastes_ and _Vinsonia_. In _Ctenochiton viridis_ the test is not to be made out in the adult stage but is clearly visible in the second stage of the female, and it is present, with the characteristic fringe, for the male. 31. Ctenochiton depressus, Maskell. N.Z. Trans., Vol. XVI., 1883, p. 132. (Plate VII., Fig. 2.) Test of adult female flat, nearly circular, thin, waxy, greyish-coloured; fringe inconspicuous or sometimes absent. No perforations or rows of air-cells. Diameter, about 1/7in. The fringe is more conspicuous in the test of the second stage. Test of male elongated, narrow, flat beneath, slightly convex above, white, glassy, thin and brittle, with a conspicuous fringe of which the segments are truncato-triangular. The test is divided into tessellations, the median row of which is quadrangular, with two series of pentagonal divisions between it and the fringe. Near the abdominal extremity a transverse narrow slit cuts the test in two, leaving a small segment at the extreme end apparently separate. Length of the test about 1/14in. Adult female filling the test, but shrivelling after gestation; colour brownish or grey. Antennæ of six joints, the third being the longest, and, as is commonly the case in the genus, often appearing like two. On the last joint a few long hairs. Foot normal; the upper digitules are fine hairs, the lower pair only a little broader. Anal ring and lobes normal. In the second stage the usual wavy edge is conspicuous; the test is thin, glassy, with normal fringe. Antennæ and feet normal. The insect is somewhat thick, with yellowish colour. Young insect normal. Adult male yellowish-red in colour, about 1/25in. in length, exclusive of the wings. General form normal. Antennæ long, with ten joints, all long and equal, except the two first, which are very short: all the joints have several hairs. Legs normal, but the tibiæ are very long and slender, and only a little thickened at the tip; tarsi somewhat thick; digitules fine hairs. Abdominal spike long, and very slightly curved. Habitat--On _Plagianthus_, _Cyathea_, &c.; Hawke's Bay.