MacGillivray, 1921
Appearance in life
Scale cover of adult female circular, slightly convex, white, with exuviae usually central or subcentral. Scale cover of immature male different from that of female: small, elongate, white and felted, sometimes carinate, with apical exuviae.
Morphology
Adult female not pupillarial; body oval to pyriform, membranous except for pygidium; lateral lobes of free abdominal segments quite well developed, never with marginal sclerotized spurs. Pygidium broad, sometimes with a slight apical notch. Median lobes well developed, parallel, separated by a small gap, never zygotic; each lobe more or less symmetrical; a pair of marginal setae present between them. Second lobes same size or larger than median lobes, bilobed, the outer lobe reduced or absent; third lobes normally reduced to a single poorly defined lobe. Ventral paraphyses usually present, arising from basal corners of median lobes at least. Gland spines present on pygidium, quite small, mostly present singly; a pair usually present between median lobes, shorter than the lobes. Anus oval to circular, situated more or less posterior to centre of pygidium; vulva situated at, or just posterior to, centre of pygidium. Marginal macroducts usually numbering 6 on either side (1 between median and second lobes, 2 associated with the third lobe, 2 on the fifth segment and 1 on a spur on the fourth segment); usually 1 also present between median lobes; each marginal macroduct of moderate size, with a sclerotized rim and with the long axis of the orifice perpendicular to the pygidial margin. Dorsal macroducts slightly smaller than marginal ducts, present in submarginal and submedian groups, arranged in distinct segmental series; absent from abdominal segments I - III. Submarginal dorsal bosses absent. Ventral duct tubercles absent. Perivulvar pores usually present in 5 compact groups. Stigmatic disc pores few, 1-3 present by each anterior spiracle. Antenna usually with only 1 seta, curved.