Subtriangular space: = internal triangle: see triangle.
Subtus: beneath; at the under surface.
Subulate: awl-shaped: linear at base, attenuate at tip.
Subulicornia: with awl-shaped antennae; applied to a combination of Odonata and Ephemerida.
Subuliform: formed like an awl: = subulate.
Sub-ventral line: in caterpillars, extends along the sides just above the base of the feet at lie edge between lateral and ventral.
Sub-ventral ridge: in slug caterpillars extends longitudinally along the sub-ventral series of abdominal tubercles.
Sub-ventral space: in slug caterpillars is the area on each side, between the lateral ridge and the lower edge of the body, and contains the spiracles.
Succincti: those chrysalids of butterflies which are held in place by a silken cord passing around the body: see suspensi.
Succineous: resembling amber in color or appearance.