of a retrolateral apical spine on the hind femora. On the basis of this, and until further material is available for more detailed examination, the author now removes the species cavernae from the genus Pleioplectron Hutton and tentatively places it in the genus Pachyrhamma Brunner as Pachyrhamma cavernae (Hutton). Acknowledgments I should like to thank Dr. R. R. Forster, formerly Assistant Director of the Canterbury Museum and now Director of the Otago Museum, and Mr. E.G. Turbott, now Assistant Director of the Canterbury Museum, for the loan of Hutton's type material of Pleioplectron simplex, P. pectinatum and P. diversum; and Dr. D. R. Ragge, curator of Orthoptera at the British Museum (Nat. Hist.), for permission to examine Hutton's specimens of Pleioplectron cavernae. I should like also to thank Dr. H. R. Thompson, of the Applied Mathematics Laboratory, for assistance in preparing the table. Literature Cited Brunner von Wattenwyl, C., 1888. Monographie der Stenopelmatiden und Gryllacriden. Verh. k.k. Zool. und Bot. Gesellsch. Wien.38: 247–394 (see p. 302). Chopard, L, 1923. On Some New Zealand Cave Orthoptera.Trans. N.Z. Inst., 54: 230–239. Hutton, F. W., 1897. The Stenopelmatidae of New Zealand. Trans. N.Z. Inst., 29: 223–240. — 1899. Supplement to the Stenopelmatidae of New Zealand. Trans. N.Z. Inst., 31: 40–43. — 1900. Notes on Some New Zealand Orthoptera. Trans. N.Z. Inst., 32: 21. — 1904. On a New Weta from the Chatham Islands.Trans. N.Z. Inst., 36: 154. Karny, H. H., 1930 Revision der Gryllacriden des Naturhistorischen Museums in Wien emschliedlich der Collection Brunner v. Wattenwyl. Ann. Nat.-Hist. Mus. Wien, 44: 182–185. Richards, Aola M., 1958a. Revision of the Rhaphidophoridae (Orthoptera) of New Zealand Part 1. The Rhaphidophoridae of the Chatham Islands 1954 Expedition. Trans. Roy. Soc. N.Z., 85: 263–274. — 1958b. Revision of the Rhaphidophoridae (Orthoptera) of New Zealand. Part II The Genus Macropathus Walker in the British Museum (Nat. Hist.) Collection Trans. Roy. Soc. N.Z., 85: 465–470. — 1959. Revision of the Rhaphidophoridae (Orthoptera) of New Zealand. Part IV. The Rhaphidophoridae of the Thames Gold-mines. Trans. Roy. Soc. N.Z., 86: 27–33. Scudder, S. H., 1869. A New Cave Insect from New Zealand. Proc. Bost. Soc. Nat. Hist., 12: 408–409. Dr. Aola M. Richards, Plant Diseases Division, Department of Scientific and Industrial Research, Private Bag, Auckland. Index to Text-figures B—basivalvula. BC—basal segment of cercus. C—cercus. DV—dorsal valve. H—hypandrium (subgenital plate of male). IA—intersegmental apodeme. MT IX—membrane tergite IX. P—paramere. P VII, P VIII, P IX—pleurite VII, VIII, IX. PD—pseudosternite. PM—perianal membrane. PN—penis. PP—paraproct. S—stylus. SAP—suranal plate, female. SGP—subgenital plate, female. SPL—suranal plate, male. S VII, S VIII, S IX—sternite VII, VIII, IX. T VII, T VIII, T IX, T X—tergite VII, VIII, IX, X. 1 VF—first valvifer. 2 VF—second valvifer. VV—ventral valve. Index to Table I. Arith. mean—Arithmetic mean. Std. Dev.—Standard Deviation. Prol.—Prolateral. Retrol.—Retrolateral. Inf.—Inferior. Sup.—Superior. Mid.—Middle. L.—Left leg. R.—Right leg.