58 Bulletin of Zoological Nomenclature 49( I ) March 1 992 Case 2770 Hylobates entelloides I. Geoffroy Saint-Hilaire, 1842 (Mammalia, Primates): proposed conservation of the specific name Paulina D. Jenkins Department of Zoology, The Natural History Museum, Cromwell Road, London SW7 5 BD, U.K. Colin P. Groves Department of Prehistory and Anthropology , Australian National University, Canberra, A.C.T. 2600, Australia Abstract. The purpose of this application is to conserve the specific name oi^ Hylobates entelloides I. Geoffroy Saint-Hilaire, 1842, currently in use for the white-handed gibbon of south-west Thailand and Tenasserim (Burma, or Myanmar). The name has been placed on the Official List of Specific Names in Zoology (Opinion 1219) but is threatened by two senior subjective synonyms, Simia longimana Schreber, [1774] and S. albimana Vigors & Horsfield, 1828. 1 . The generic name Hylobates Illiger, 1811 (p. 67) was placed on the Official List of Generic Names in Zoology in Opinion 122 (January 1931). Subsequently, the specific name of Homo lar Linnaeus, 1 77 1 (p. 52 1 ), the type species of Hylobates by monotypy, was placed on the Official List of Specific Names (Direction 22, November 1955). In Opinion 1219 (September 1982; see also BZN 35: 197-198) a neotype for //omo /or was designated under the plenary powers which attached the name to the Malayan white-handed gibbon (the 'petit gibbon' of Buffon, 1766, pi. 3), type locality 'Malacca', in accordance with current understanding and usage. The specific name of Hylobates. entelloides L Geoffroy Saint-Hilaire, 1842 (p. 717), currently in use for the white-handed gibbon of Thailand and Tenasserim (the 'grand gibbon' of Buffon, 1 766, pi. 2), was also placed on the Official List in Opinion 1219. However, the name entelloides has two senior subjective synonyms and this problem has so far not been resolved. The name is currently used as a subspecies oi Hylobates lar (Linnaeus). 2. In his description of Homo lar Linnaeus ( 1 77 1 ) cited two previous references: 'Golock. Act. Angl. 1769. pi. 71. t. 3. Gibbon. Buff. anim. XIV. p. 92. t. 2, 3?'. The second of these citations refers to Buffon's two plates (1766, pis. 2 and 3) which were reproduced in Schreber ([1774], p. 67, pi. 3; see Sherborn, 1891, p. 588 for the date of publication) under the name Simia longimana; Schreber's specific name is therefore a junior subjective synonym of Homo lar Linnaeus, 1771. Latreille ( 1 804, p. 276) was the first to separate Buffon's large and small gibbons, undifferentiated by Linnaeus and Schreber, into separate taxa, referring to the former as Pithecus lar Linnaeus and the
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