Locality.—New Zealand only.

There is considerable confusion among the species of this genus, if, indeed, there are more than one. I shall commence with the only species that has been adequately described, and then point out the characters which may possibly separate the others from it.

Pachyrhamma speluncæ. Plate XIII., figs. 12–12c.

Hemideina speluncœ, Colenso, Trans. N.Z. Inst., vol. xiv., p. 280 (1882).

Fastigium rather low. Antennæ long, nearly seven times the length of the body; basal joints cylindrical and nearly glabrous towards the middle, gradually getting swollen distally, and beyond the middle becoming cylindrical and hairy. In the middle each joint is swollen a little below the apex, and in many of the joints the lower side of this swefling bears a short, blunt spine; on the proximal half of the antenna these spines are small or rudimentary; near the middle, joints bearing small spines alternate with joints bearing much larger ones; there are no spines on the distal portion. Inferior margins of the lobes of the pronotum horizontal; the pronotum and mesonotum distinctly margined. Fore femora, below with a row of five spines on the anterior (inner) edge and none on the posterior edge. Middle femora, below, with two or three, spines on each edge. Hind femora, below, with eight spines on the posterior (inner) and three on the anterior (outer) edge. Fore and middle tibiæ, below, with four spines in each row, and, in addition, the middle tibiæ have, above, four spines in an anterior and two in a posterior row. Hind tibiæ, above, with 36 spines in the inner and 41 in the outer row; these spines are distant in distal portion but smaller and more crowded in the proximal portion of the tibia. The superior pair of apical spurs are not half the length of the first joint of the tarsus, and the middle pair are not half the length of the superior pair; all of them have numerous long hairs. First joint of the hind tarsus not quite so long as the other three together; the third very short. In the fore and middle tarsi the first joint is longer than the other three together. Lobes of the abdominal terga with distant granulations. Subgenital plate of male with a lanceolate projection between the bases of the styles, which is strengthened by a Y-shaped keel; styles not projecting so far as the apex of the plate. Cerci slender.

Colours.—Pale-tawny; both borders of the pronotum and the posterior borders of the mesonotum, metanotum, and abdominal terga dark reddish-brown, the actual margins being white. Distal portions of the femora dark reddish-brown, with two white bands; tarsi nearly white.