The Chinese species Cryptococcus ulmi Tang & Hao is found to be distantly related to other sampled Cryptococcus species based on both molecular and morphological study. A new felt scale genus, Macroporicoccus Nan & Wu gen. n., is erected therefore for C. ulmi. The new genus differs from other eriococcid genera due to the presence of large simple pores, here referred to as macrodisc pores. The adult female of Macroporicoccus ulmi (Tang & Hao) comb. n. is redescribed and illustrated. Some important taxonomic characters are illustrated with SEM photographs.

The mealybug genus Antonina Signoret (Coccoidea: Pseudococcidae) in China is reviewed and 12 species are recognized. Of these, Antonina nanlingensis Wu & Lu sp. nov. is a new species, collected from Ruyuan county, Guangdong Province, under the leaf sheaths of Indocalamus longianritus (Poaceae). The adult female and first- and second-instar nymphs of A. nanlingensis are described and illustrated. Additionally, A. sandakanae Williams is recorded from China for the first time, but all previous records of A. zonata Green from China are believed to be misidentifications of A. milleri Williams. A key to the adult females of Antonina species from China is included, as are keys to the first- and second-instar nymphs where these stages are known.

The oak red scale insect, Kuwania quercus (Kuwana), was described from specimens collected from the bark of oak trees (Quercus species) in Japan. More recently, the species has been identified from California and China, but Californian specimens differ morphologically from Japanese material and are considered here to be a new species based on both morphological and molecular data. In this paper, an illustrated redescription of K. quercus is provided based on type specimens consisting of adult females, first-instar nymphs and intermediate-stage females, and a lectotype is designated for Sasakia quercus Kuwana. The new Californian species, Kuwania raygilli Wu & Gullan, is described and illustrated based on the adult female, first-instar nymph and intermediate-stage female. A new generic diagnosis for Kuwania Cockerell based on adult females and first-instar nymphs, and a key to species based on adult females are included.

The immature stages of Kuwanina betula Wu & Liu are described and illustrated. Based on morphological and molecular data (18S and 28S rDNA), it is argued that K. betula is closer to Pseudochermes Nitsche than to Kuwanina Cockerell in Fernald and so this species is transferred to Pseudochermes as P. betula (Wu & Liu) comb. nov..