Submental: pertaining to the submentum.
Submental peduncle: in Coleoptera, the prolonged portion of the gula supporting the mentum.
Submentum: the basal sclerite of the labium, by means of which it is attached to the head.
Subnodal sector: in Odonata, = radial sector (Comst.).
Sub-nymph: applied to the resting or pupal stage of female Coccidae; also to a supernumerary stage before the formation of the pupa, and thus = pseudo-pupa.
Sub-ocellate: an ocellate spot that is blind or without a pupil.
Sub-ocular: beneath or below the eyes.
Sub-oesophageal ganglion: situated in the head below the oesophagus, formed by a union of the posterior three primitive head ganglia.
Suborder: a division of an order higher than a family, based on a character common to a large series of species; e.g. the Homoptera and Heteroptera in the order of Hemiptera.
Sub-pedunculate: in Coleoptera, when the constriction between pro- and meso-thorax is so great as to give the appearance of a narrow waist.