Illustrations of immature characters used in the key (if with longitudinal division, dorsal on left and ventral on right) A Example of marginal ring of truncate setae B humeral lobes of triozid species C circumanal ring shape of Bactericera cockerelli (top) and Powellia vitreoradiata (bottom) D apex of abdomen in Cardiaspina E apex of abdomen in Glycaspis F size and structural difference between Blastopsylla (left) and Cryptoneossa (right), showing detail of circumanal rings G abdomen of Heteropsylla cubana showing placement of paired lanceolate setae H abdomen of Mesohomotoma hibisci showing bands of pores and indicating terminal position of anus. Some images redrawn with reference to Taylor (1962, 1985, 1990), White and Hodkinson (1985), and Muddiman et al. (1992). Scale bars: 0.1 mm (C); 0.25 mm (F).