dorsal sclerite of the meso- and meta-thorax: in
Coleoptera, the triangular piece between the elytra at base and
universally referred to as the scutellum: in Heteroptera, a similar
sclerite between base of hemelytra: in Diptera, a sub-hemispherical.
body posteriorly cut off by an impressed line from the dorsum of the
meso-thorax.

Scutes: the chitinous shields or plates on the segments of larvae.

Scutiform: = scutate; q.v.

Scutum: the second dorsal sclerite of the meso- and meta-thorax.

Seal-brown: a brilliant deep red-brown: almost like, but darker than
castaneous [between dragon's blood and Indian red].

Sebaceous: fatty or oily; applied to glands secreting such substances.

Sebific: oily; sebaceous; somewhat sticky.

Sebific duct: carries the excretions of the colleterial gland to the bursa
copulatrix.

Second antennal segment: the third or tritocerebral segment of head.

Secondaries: the hind wings; always attached to the meta-thorax.

Secondary sexual characters: features possessed by one sex but not
the other, other than the differences of the reproductive organs
themselves; e.g. color, size, shape, etc.

Second clypeus: see anteclypeus.

Second costal cell: in Hymenoptera (Pack.); is the stigma.

Second inner apical: in Hymenoptera (Nort.), = media 3 (Comst), to the
junction of medial cross-vein; also called sub-marginal nervure in
part.

Second lateral thoracic suture: in Odonata, extends front base of
secondaries to the rear of the third coxa.

Second longitudinal vein: in Diptera:= radius 2 + 3 (Comst). Second
maxilla: the labium: q.v.

Second maxillary segment: the seventh or labial segment of head.

Second median area: see median area; areola.

Second submarginal nervure: Hymenoptera (Nort.), = radius 5
(Comst.).

Secretion: any matter produced by a gland: in Coccidae, specifically,
the waxy, fibrous, cottony or silky substances forming the "scales."

Secretionary supplement: that part of a Diaspid scale extending
beyond or around the pellicles.

Secretory: concerned in the process of secretion.

Sectores coronis: the tearing or cutting structures used by the
Lepidoptera in working out of a cocoon.

Sectors: longitudinal veins in Odonata, which strike the principal
veins at an angle, and usually reach the apex or hind margin: they
are radial, subnodal, principal, nodal, median, short, and upper and
lower of triangle: all of which see.

Secund: pointing one way: unilateral.