Art. VII.—Notes on some New Zealand Orthoptera.
[Read before the Philosophical Institute of Canterbury, 20th August, 1899.]
Lissotrachelus maoricus, Walker, Cat. Dermap. Salt, in Brit. Museum, p. 74 (Scleropterus)
I found this species not uncommon at Whangarei, among grass. It is related to L. ater of Borneo, but differs not only in specific characters but in others which might be considered as generic.
The antennæ are unicolor and not moniliform; the third joint of the palpus is clavate; the ovipositor is straight, and the metatarsus of the hind legs has a pair of apical spines as long as those of the tibia. The fore tibiæ are without auditory pits, and the lateral lobes of the pronotum are about as deep as long.
The following are additions to Walker's description: In both the male and the female the elytra are abbreviated, not reaching the end of the abdomen. They have seven longitudinal
nervures, without any transverse branches. The ovipositor is about the length of the cerci; it is slender, and curved upwards. The first joint (metatarsus) of the posteriortarsus has a pair of long apical spines.
Length, 7 mm.; pronotum, 1 ½ mm.; posterior femur, 5 mm.; ovipositor, 1 ½ mm.
Gryllodes maorius, Saussure, Melange Orthop., p. 377.
This species is put down to New Zealand by Saussure on the evidence of a specimen in the Berlin Museum. I have never seen it. The following is Saussure's description. “Reddish-fuscous, with grey tomentum; head fuscous, with a yellowish transverse band above the antennæ; lobes of the pronotum washed with testaceous. Elytra much shortened, covering the first abdominal segment, contiguous at their bases. Ovipositor shorter than the hind femora, the valves rather depressed, slightly acute. Mediastinal vein unbranched. Head globose, moderately broad between the antennæ. Pronotum rather flat above.
“Length, 13.5 mm.; pronotum, 2.4 mm.; hind femur 8 mm.; ovipositor, 7 mm.; elytra, 3 mm. Width of pronotum, 7 mm.”
The genus Gryllodes differs from Gryllus in having a narrower front between the antennæ. The auditory pit on the inner side of the fore tibia is generally absent. The mediastinal vein of the elytra is unbranched in the female, and singly branched in the male; the dorsal field of the female is longitudinally veined. In Gryllus the mediastinal vein has, generally, several branches, and the dorsal field of the female is, generally, rhomboidly reticulated.
Hemideina parva, Buller, Trans. N.Z. Inst., xxvii., 147 (Deinacrida).
I have examined the type of this species and find it very distinct, but it undoubtedly belongs to the genus Hemideina.
The anterior femur has no apical spines. The middle femur has an apical spine on the inner side, as also has the posterior femur, and the latter is armed below with eight strong teeth in the outer and seven in the inner row. The hind tibiæ above have five spines in the inner and four in the outer row. The middle tibia has two spines on the upper side, while below there are three in each row. The fore tibia has no spines above, and below there are four in each row. The pronotum is strongly roughened, the meso- and meta-nota slightly so. The abdominal terga are smooth; the second, as well as those following, is emarginate.
The two spines on the upper surface of the middle tibia-place this species in a separate group from the others.
Hemideina broughi, Buller, Trans. N.Z. Inst., xxviii., 324 (Deinacrida).
An examination of the type in the Colonial Museum, at Wellington, showed me that it had very distinct apical spines on the middle and posterior femora, and that it is identical with my H. ricta. I was misled by Sir W. Buller's statement, “The four anterior femora free from spines.”
Pleioplectron cavernæ, sp. nov. Pachyrhamma edwardsii, Brunner, Mon. Stenopelmatidæ, p. 58, not H. edwardsii, Scudder.
Joints of the antennæ cylindrical in both sexes. Fore and middle femora unarmed below; hind femora with five to seven spines below on the inner side and two minute ones on the outer in the male, but only four on the inner side and none on the outer in the female. Fore and middle tibiæ with three spines in each row. Hind tibiæ with from twenty-five to thirty spines in the outer, and twenty-two to twenty-eight in the inner row, small but regular, some of the proximal ones very minute. Subgenital plate of the male with a lanceolate projection between the bases of the styles; not keeled.
Length of pronotum, ♀L 6 mm., ♂L 5 mm.; of thorax, ♂L 13 mm., ♀L 12 mm.; of abdomen, ♂L 20 mm., ♀L 16 mm.; of fore tibia, ♂L 14 mm., ♀L 11 mm.; of hind tibia, ♂L 34 mm., ♀L 20 mm.; of hind femur, ♂L 27 mm., ♀L 18 ½ mm.; of antennæ, ♂L 93 mm. ♀L 55 mm.
Collected by Mr. R. M. Liang in a small cave near the Karapiti fumarole, Taupo.
Colour brown, spotted with yellowish-brown. Legs yellowish-brown, the femora banded with brown. The colours are variable, no two specimens having the same markings.
This species is easily distinguished from the others belonging to the genus by the greater number of spines on the lower surface of the hind femur. Described from four males and two females.
The type of Pachyrhamma is by description Pleioplectron cavernæ, but by figure it is Pachyrhamma fascifer; consequently, I suppose that I am at liberty to select one or the other. I take the figure of P. fascifer (= novæ-zealandiæ) as the type, for to do otherwise would entail the making of a new generic term for it.