Key to The Species.
a. Fore tibiæ, below, with 4 spines in each row.
b. Mid tibia, above, with 2 or 3 spines on inner sideO. pallitarsis.
bb. Mid tibia, above, with 4 spines on inner side.
c. Mid tibia, above, with 2 spines on outer sideO. focalis.
cc. Mid tibia, above, with 3 spines on outer sideO. maori.
aa. Fore tibiæ, below, with 3 spines in each rowO. maculifrons.
Libanasa pallitarsis, Walker, Cat. Dermaptera Saltatoria in British Museum, part v., suppl., p. 24 (1871).
Head smooth, the front very faintly striated. Pronotum
margined, the lobes rounded, the lateral furrows obsolete. Hind femora transversely grooved on upper side only; those of the female with a short apical spine on the inner side. Fore and mid tibiæ, below, with four spines in a row; above the fore tibiæ have one anterior spine only, and the mid tibiæ have two anterior and two or three posterior spines. Hind tibiæ, above, with eight small spines in each row, in addition to the subapical spines; below there are three small distant spines. The subgenital plate of the male has the apex nearly straight between the insertions of the styles.
Colours.—Dark-brown or black, with a white spot on each side of the fastigium and a pale-tawny stripe down the centre of the head and back, especially well marked on the pronotum. A large patch of the same pale colour on the lobes of each of the thoracic nota, and some on the sides of the abdomen. Tarsi pale-yellowish. Some specimens are nearly all dark-brown.
Length, 23mm.; pronotum, 5 mm.; thorax, 8 mm.; abdomen, 14mm.; ovipositor, 11mm.; fore tibia, 4mm. ♂, 5mm. ♂; hind tibia, 9mm. ♂, 12mm. ♀; hind femur, 11mm. ♂, 14mm. ♀. Width of pronotum, 5mm.
Localities.—Wellington, Canterbury, Otago.
Common; generally in the earth among the roots of plants, sometimes in rotten wood. I have a specimen from the Hooker Valley.
Male: Head smooth, very slightly wrinkled in front; fastigium very broad and flat, the width more than three times that of the first joint of the antennæ. Thoracic nota margined, the lobes of the pronotum descending considerably below the others, uniformly rounded. Hind femora sulcate below, the transverse grooves on outer surface obsolete. Fore and mid tibiæ, below, with four spines in each row; above the fore tibia has two spines on the inner side; the middle tibia has two spines in the outer and four in the inner row. Hind tibiæ rounded above, with eight small spines in the inner and six in the outer row, besides the subapical spurs; below there are a pair of spines just behind the apical spurs, followed by four single spines. The first to the fifth abdominal terga have the anterior half of their lobes roughened, the posterior half smooth. Supra-anal plate triangular, broadly truncated at the apex. Cerci short, curved, erect. Subgenital plate distinctly concave at the apex between the insertions of the styles.
Colours.—Head black; a spot on each side of the fastigium, the lower part of the fastigium, the genæ, and the clypeus white. Clypeus with two black spots. Upper portion of clypeus and part of the face grey. Body black above, the front
margin of the pronotum and the posterior margins of all the thoracic nota and abdominal terga greyish-white; below greyish-white.
Length, 27mm.; pronotum, 7mm.; thorax, 11mm.; abdomen, 13mm.; fore tibia, 8mm.; hind tibia, 14mm.; hind femur, 17mm. Width of pronotum, 8mm.
Locality.—Ophir, in Central Otago.
Described from a single specimen only. The female is not Known.