128 OBSERVATIONS ON SOME AUSTRALIAN FOREST INSECTS. 7. The Significance of the Glycasjns spp. (Hemiptera: Homoptera, Psyllidae) Associa-tions with their Eucalyptus spp. Hosts; Erection of a New Subgenus and Descriptions of Thirty-eiglit New Species of Glycaspis. By K. M. MooRE, Forestry Commission of New Soutli Wales. (Plates vi-vii; forty-eight Text-figures.) [Read 26th April, 1961.] SyTwpsis. The genus Glycaspis Taylor 1960 is considered, and divided into two subgenera on the basis of morphological divergence among, and host-associations of, the species contained in it. Those species which breed on Eucalyptus spp. hosts contained in Blakely's Renantherae-Renantherae Normales group, constitute the most primitive subgenus Glycaspis {Glycaspis) : the remaining species representing a more recent evolutionary development and placed in the subgenus Glycaspis (Alio glycaspis) subgen. nov., do not breed on hosts contained in that eucalypt group. The significance of the Glycaspis s'pp.-EitcalyiJtus spp. host-associations is discussed. Thirty-eight new species of Glycaspis are described ; previously described species are considered', and the coverings made by nymphs are figured. Introduction. Species of the genus Glycaspis occur throughout the mainland of Australia and in Tasmania, and it is apparent that numerous species are as yet undescribed. Large populations of Glycaspis spp. have consistently damaged a number of Eucaly%)tus spp. in coastal and highland areas of New South Wales for many years. During investigations in these areas on the cause of mortalities among Eucalyptus saligna Smith (Sydney blue gum) (Moore, 1959), it became evident that a complex of Glycaspis spp. occurred where damage by these psyllids was severe. Locations of attacked areas were from sea-level to an altitude of about 3,000 feet and numerous collections of specimens were made from these and other areas. The Genus Glycaspis. Glycaspis Taylor 1960. Synonymy: Psylla Dobson, 1851, pp. 235-241, PL 18, fig. 4; Spondyliaspis Schwarz, 1898, p. 68; Froggatt, 1900, p. 288; Tuthill & Taylor, 1955, pp. 230-231, fig. 1; Glycaspis Taylor, 1960, p. 384, PL 1, figs 2 and 3. Dobson (1851) described the species on which the genus Glycaspis is now based, and placed it in the genus Psylla. Signoret (1879) erected the genus Spondyliaspis to which subsequently were assigned by Schwarz (1898), Froggatt (1900, 1903), and Tuthill & Taylor (1955) species now included in the genus Glycaspis. The genus Spondyliaspis was re-defined in error by Schwarz (1898), Froggatt (1900) and Tuthill & Taylor (1955). Taylor (1960) investigated the status of the genus Spondyliaspis and erected the genus Glycaspis to receive the species described by Dobson, Schwarz, Froggatt and Solomon (1936) which were erroneously assigned to Spondyliaspis. Species of the genus Glycaspis are separated into two groups, each of which is given subgeneric status in this paper. The apparent host-specificity of most of the Glycaspis spp. occurring on Eucalyptus spp. suggested that an examination of both the psyllid and eucalypt taxonomy should be made, and when this was done it was estab-Proceedings of the Linnean Society of New Soxtth Wales, 1961. Vol. Ixxxvi, Part 1
Observations on some Australian forest insects. 7. The significance of the Glycaspis spp. (Hemiptera: Homoptera, Psyllidae)associations with their Eucalyptus spp hosts; erection of a new subgenus and descxriptions of thirty-eight new species of Glycaspis
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