Genus Gymnoplectron, gen. nov.
Form large and slender. Head inclined under the body: antennæ slender, very long, approximated but not touching at their bases; the first joint, large, longer than broad; the second shorter, rather inflated; the rest cylindrical; the hairs very short, none on the basal joints. Fastigium narrow, slightly sulcate. Fifth joint of the maxillary palpi considerably longer than the fourth, which is about equal, to the third. Anterior border of the pronotum slightly rounded, projecting over the occiput; the posterior border straight; lateral lobes not projecting below those of the mesonotum. Sternum narrow. Legs long and slender; coxæ of the fore and hind legs nearly touching its opposite, the first segment of the abdomen entirely behind the hind coxæ; those of the fore legs spined. All the femora deeply grooved and spined below; fore femora with a small, blunt, coloured, apical spine on the inner side; middle and hind femora with a pair of blunt apical spines. Fore and middle tibiæ with two pairs of apical spines, unarmed above. Hind tibiæ with four pairs of apical spines, of which the superior intermediate are twice as long as those just below them, and the inner is longer than the outer; the superior and inferior pairs are small; all four pairs are articulated to the tibia, and all are without hairs; below they are rounded and unarmed, above they are flattened and armed with long spines. First and second joints of the hind tarsi terminating in a pair of rather strong spines; first joint longer than the fourth, but shorter than the other three together. Supra-anal plate very short, the posterior margin slightly concave. Cerci rather long and slender, erect. Subgenital plate of male linear, rounded at the apex and grooved below, projecting beyond the supra-anal plate; styles short and thick, inserted at each side of its base.
Locality.—New Zealand only.
Hemideina longipes, Colenso, Trans. N.Z. Inst., vol. xix., p. 145 (1887). Macropathus maximus, Buller, Trans. N.Z. Inst., vol. xxvii., p. 145 (1895).
Head smooth; fastigium rather low, broadening, out below the antennæ and gradually passing into the front. Pronotum margined, the inferior margins of the lobes horizontal, the corners only rounded. Lobes of the mesonotum and metanotum rounded, their anterior angles obliquely cut off. Inferior
keels of all the femora with numerous blunt serrations. Fore femora with four spines on the inner keel, none on the outer; middle femora with three spines on each keel; hind femora with about twenty-two spines on the outer keel and about twelve larger spines on the inner keel Fore and middle tibiæ with three pairs of spines below. Hind tibiæ, above, with thirteen to eighteen long spines in the outer and twelve in the inner row, all nearly equal and at equal distances; longest of the apical spurs not more than half the length of the first joint of the tarsus; all the tibiæ finely granulated. Sides of the abdominal terga with scattered granules.
Colours.—Chestnut-brown, darkening on the abdomen, hind tibiæ, and tarsi. Fore and middle tibiæ and tarsi yellowish, the articulations, chestnut-brown.
Length, 30mm.; pronotum, 10mm.; thorax, 18mm.; abdomen, 12mm.; fore tibia, 26mm.; hind tibia, 56mm.; hind femur, 49mm. Width of mesonotum, 11mm.
Localities.—Norsewood, on totara — trees; Coromandel, near Auckland.
Described from two male specimens, one of which is Mr. Colenso's type. The female is unknown.