PROC. ENTOMOL. SOC. WASH. 101(1), 1999, pp. 99-105 OBSERVATIONS ON TWELVE FAMILIES OF HOMOPTERA IN MACAU, SOUTHEASTERN CHINA, FROM 1989 TO THE PRESENT Emmett R. Easton and Wing-Wah Pun (ERE) University of Macau, P.O. Box 3001, Macau; (WWP) Departamento de Services Agrarios de Camara Municipal das Ilhas, Coloane, Macau Abstract. — The insect species found in present day Macao are largely those feeding upon small numbers of remnant agricultural plantings or on those plants representing the subtropical evergreen broad leaf forest or remnants of the tropical monsoon rainforest as agricultural crops are only grown on a small scale. Records of 37 species of Homoptera of the Aleyrodidae, Aphididae, Cicadellidae, Cicadidae, Coccidae, Delphacidae, Diaspi-didae, Flatidae, Fulgoridae, Margarodidae, Pseudococcidae and Psyllidae are listed for the Portuguese territory of Macao of which 27 are new records. Key Words: Macao, Homoptera, faunal list In the early part of the present century a number of homopteran species were listed as occuring in Macao and Hong Kong as well as part of the Guangdong Province of mainland China all of which was known at that time as South China (Kirkaldy 1909). Rice was considered the main agricultural crop and farming was the chief livelihood of most of the people in south east China. The land area that John C.W. Kershaw (Kir-kaldy 1909) collected insects on was con-sidered an island at that time but it is now connected to the mainland of China and to-day is considered the peninsula. The ma-jority of the collections made in this study, however were taken from the islands of Tai-pa and Coloane which are connected to the peninsula either by two bridges (Taipa) or a causeway (Coloane) which did not exist in the early part of the century. Many of the insect species noted to occur in Macao at the beginning of the century may now be non-existant. We were unable to find evi-dence, for example, of the planthoppers de-scribed by Frederick Muir (1913) because of modernization and construction of hotels and apartment complexes that have re-placed agricultural farmlands. Easton and Pun (1997) discussed the species of true bugs in the region and here we discuss the Homoptera. Materials and Methods Insects were sampled routinely from the walls of window-lit buildings (Taipa island) that are often illuminated at night. Other in-sect groups less sensitive to light, such as the cicadas other than those in the genera Cryptotympana, and Huechys, as well as the Flatidae, Fulgoridae and the scale in-sects, were sampled with an insect net from trees, shrubs and grasses in forested areas on the islands of both Coloane and Taipa as well as from the peninsular area connected to the Guangdong region of China. The names of the plant hosts follow the Macau Catalogue of plants and their addenda (1991). Voucher specimens of the Homop-tera named here are housed in the Ento-mology Museum of the Agrarian Services on Coloane (Seac Pai van Park) under the curatorship of the second author.