Genus Pachyrhamma, Brunner. (1888.)
Body rather stout, legs slender. Head vertical. Antennæ thick, very long, touching at their bases, covered with long hairs; first joint much longer than broad; the second cylindrical, short; the third narrower but not much longer than the second, shorter than the first. Eyes large, semicircular. Fastigium rising abruptly, sulcate. Face flat, shining, glabrous. Maxillary palpi with the third and fourth joints subequal, the fifth rather longer. Pronotum roundly produced in front over the occiput, truncated behind. Sternum very narrow. Metasternum with an elevated transverse ridge, Legs long; fore coxæ touching each other; hind coxæ closely approximated but not quite touching; fore coxæ armed with a spine. Fore and middle femora each with a short, stout, apical spine on the inner side; hind femora with a pair of apical spines; all the femora sulcate below. Fore and middle tibiæ with two pairs of apical spines. Hind tibiæ with three pairs of apical spines, of which the superior pair is the longest, the inferior pair the shortest; above sulcate with numerous small equal and equally-distant spines; below rounded and finely granulated. The spurs on the hind tibiæ with long hairs. First and second joints of hind tarsi with a pair of small apical spines only. Supra-anal plate short, rounded. Cerci rather long. Subgenital plate lanceolate, produced. Ovipositor narrow, nearly straight. Subgenital plate of female small, the posterior margin broadly emarginate.
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.
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.
Length, 25mm.; pronotum, 7mm.; thorax, 14mm.; abdomen, 14mm.; fore tibia, 21mm.; hind tibia, 38mm.; hind femur, 32mm. Width at the mesonotum, 9mm.
Locality.—Forty-mile Bush, near the head of the Manawatu River. In limestone caves (Colenso).
The foregoing description is taken from the type specimen, which is a male.