174 Bulletin oj Zoological Nomenclature SIPHOCORYNE ANGELICAE DEL GXJERCIO, 1911 (HOMOPTERA, APHIDOIDEA): REQUEST FOR SUPPRESSION UNDER THE PLENARY POWERS. Z.N.(S.) 1852 By H. L. G. Stroyan (Ministry of Agriculture, Fisheries and Food, Plant Pathology Laboratory, Hatching Green, Harpenden, Herts., England) 1. G. del Guercio (1911, Redia 7 : 328) described a new species of aphid from Portugal as Syphocoryne (sic pro Siphocoryne) angelicae. The host plants were listed as Angelica silvestris L. and Artemisia absinthium L. 2. This species has never subsequently been noticed in the primary zoo-logical literature, except that C. Borner (1952, Milt. Thiiring. hot. Ges. Beiheft 3 : 121) placed Siphocoryne angelicae del Gu. in the synonymy of Cavariella archangelicae (Scopoli). This action was taken at a time when it was widely believed that del Guercio's collection had been entirely destroyed in the Second World War, and took no account of certain features of del Guercio's description that could not apply to C. archangelicae. 3. A large part of del Guercio's collection has subsequently been found intact, including material of Syphocoryne angelicae from both Angelica and Artemisia. The former sample is considered to be the type series in view of the name given to the species by del Guercio, and a lectotype has been selected therefrom. The data of this sample, taken from the original slide, are: " 18/23, Siphocoryne angelicae del G. Ombellifero (grande), Portogallo, 64 ". The word ' Ombellifero ' has been deleted, and the name ^Angelica silvestris ' written over the top of it. The lectotype is a remounted apterous vivipara. Both this sample and the one from Artemisia, which bears the data " 18/22, Syphocoryne angelicae, Artemisia absinthium, 61 " are now housed in the Institute of Agri-cultural Entomology, University of Milan, Italy. The numbers 18/22, 18/23 are a subsequent catalogue numbering. 4. Both the existing samples of Siphocoryne angelicae consist of the same species, and belong to the genus Coloradoa Wilson. The species is a senior subjective synonym of Coloradoa absinthiella Ossiannilsson, 1962. 5. It is also clear that the consequence of accepting angelicae as the valid specific epithet for Coloradoa absinthiella Ossiann. would be to replace an appropriate name by an inappropriate one, since Coloradoa absinthiella has not at any time been recorded from Angelica syhestris except by del Guercio, and further belongs to a group of species exclusively associated with Compositae, so far as it is known at present. 6. It is therefore requested that the International Commission : ( 1 ) use its plenary powers to suppress the specific name angelicae del Guercio, 1911, as published in the binomen Siphocoryne angelicae, for the pur-poses of the Law of Priority but not for those of the Law of Homonymy; (2) place the specific name suppressed under the plenary powers in (1) above, on the Oflicial Index of Rejected and Invalid Specific Names in Zoology. Bull. zool. Nomencl., Vol. 25, Parts 4/5. January 1969.