in the plural the lateral
openings on the segments of the insect body through which air enters
the tracheae:= stigmata.

Spiracular area: the anterior of the three areas between lateral and
pleural carinae on the metanotum of some Hymenoptera: =first
pleural area.

Spiracular line: in caterpillars is that which includes the spiracles: =
stigmatal.

Spiracular sulcus: on the metanotum of Hymenoptera, is a grooved
linear channel extending from spiracle to apical margin.

Spiral: rolled up like a watch spring, or twisted like a cork-screw.
{Scanner's comment: Nowadays it is more correct to regard the
corkscrew as helical and the watch spring as spiral.}

Spiral fibre: the spiral thickening or folding of the chitinous lining of a
trachea, which gives to the latter its characteristic microscopic
appearance as well as its support and elasticity:= ctenidium.

Spirignath: = spiritrompe.

Spiritrompe: the spiral tongue in Lepidoptera.

Splanchnic: applied to the outer embryonic layer of the rudiment of
the mid-intestine: or the inner layer of the mesoderm which,
becoming applied to the walls of the alimentary canal, develops into
the muscle fibres thereof.

Splendens -ent: shining: with a metallic glitter.

Splitter: one who splits or describes species or genera upon minute
characters which the "Lumper" (q.v.) deems insufficient to authorize
them.

Spongioplasm: the net-like structure of protoplasm in a cell.

Spongiose: a soft, elastic tissue resembling a sponge.

Spoon: = bouton; q.v.

Spring: in Collembola. = furcula: q.v.

Spur: a short, stiff, generally blunt process and usually not
articulated at its base: in the plural refers to paired spiniform
processes at or near the end of tibia:.

Spur formula: a numerical expression of their arrangement; as 2-3-4;
two spurs on fore tibia, 3 on middle, and 4 on posterior; in
Trichoptera.

Spurius: false: applied to aborted anterior legs in some diurnal
Lepidoptera.

Spurious cell: in Diptera (Pack.), = 3d anal (Comst.).

Spurious veins: certain folds or thickenings in the wing surface which
resemble a vein so nearly as to be readily mistaken and sufficiently
constant to be useful in classification.

Squama: in Odonata, the sclerite that bears the palpus of both maxilla
and labium: the scale-like first abdominal segment of some ants: a
scale-like appendage covering the base of primaries in Lepidoptera,
and so = patagium; q.v.: a small scale above the ha