Adult females with elongated antennæ of eleven joints; covered with mealy or cottony secretion; with or without ovisac; rostrum present Icerya. Adult females with antennæ of eleven joints; naked, or covered with cottony or mealy secretion; rostrum absent Cœlostoma. _Genera not yet represented in New Zealand._ Adult females having antennæ of eleven joints; naked. Males with several long processes, or tassels, on the abdominal segments Monophlebus. Adult females with antennæ of eleven joints; naked. Males without tassels Leachia. Adult females with conical antennæ of eleven joints; covered with cotton Ortonia. Adult females with antennæ of ten joints. Males bearing a long mass of silky hairs on the last abdominal segment Callipappus. Adult females with antennæ of ten joints; covered with secretion, partly cottony, partly plates of wax Walkeriana. The genera _Drosicha_, Walker (list of Homop. Suppl., 1858, 306, 1) and _Guerinia</sc>, Targioni-Tozzetti (Signoret, loc. cit., 1875, p. 356) are here united to _Monophlebus</sc>. The genus _Llaveia</sc>, Signoret (loc. cit., 1875, p. 370), is omitted, its affinities being doubtful. Subdivision V. _Not yet represented in New Zealand._ Adult females with antennæ of variable number of joints; anterior pair of feet abnormally enlarged, deformed; rostrum, mentum, and buccal apparatus absent. Eyes of male facetted Porphyrophoridæ. Adult females with antennæ of eleven joints; covered with mealy or cottony secretion Porphyrophora. Adult females with antennæ of seven joints; covered with waxy or calcareous secretion Margarodes. Subdivision I.--ACANTHOCOCCIDÆ. Female insects exhibiting in all stages the anal tubercles. Young larvæ free, naked, active. Females of second stage active, covered with thin cottony secretion. Adult females stationary; naked, or either resting on or covered with a thick cottony or felted secretion. Anal tubercles in all stages conspicuous, bearing terminal hairs. Anogenital ring inconspicuous, with fine short hairs. Body distinctly segmented. Male pupæ enclosed in cottony or felted sac. Abdominal spike of adult usually short, with a curved appendage. Genus: PLANCHONIA, Signoret, Ann. de la Soc. Entom. de France, 1868, p. 282. Maskell, N.Z. Trans., Vol. XIV., 1881, p. 223.