Explanation of Terms Used in Entomology | Page 5

on the ventral
segments of the abdomen of some Coleoptera.
Ambulatory: moves by walking; formed for walking.
Ametabola -ous: insects without obvious metamorphoses, in which the
larvae usually resemble the adult and the pupae are active.
Ametabolion: an insect that has no distinct metamorphoses.
Amethystine -us: bright blue with a reddish admixture; clear like an
amethyst [between mauve and lilac].
Amnion: the inner of the two membranes enveloping the embryo.
Amnion cavity: a tube-like insinking from the ventral plate of the
embryo, extending cephalad.
Amnion fold: the extensions of the amnion which close the mouth of
the amnion cavity in the embryo.
Amnios: the first cast skin of the larva when a moult occurs almost
immediately after emergence from the egg.
Amoebiform: having the appearance or properties of an amoeba.
Amoeboid: applied to movements similar to those of an amoeba.
Amphibiotica: those pseudoneuropterous insects whose larvae are

aquatic but whose imagos are aerial; stone-flies; May-flies; dragonflies.
Amphimixis: the mingling of the germ plasm of two individuals.
Amphiodont: applied to those forms of male Lucanids bearing
mandibles of medium size, between teleodont and priodont;
=mesodont.
Amphipneustic: applied to larvae which have the spiracles confined to
the anterior and terminal segments.
Ample: broad; large; sufficient in size.
Amplected: when the head is received into a concavity of the prothorax;
e.g. Hister.
Ampliate -us: moderately dilated.
Amplificatus: dilated; enlarged.
Ampulla: Orthoptera; an extensile sac between head and prothorax used
by the young in escaping from oötheca, and later, in molting:
Heteroptera; a blister-like enlargement at the middle of the anterior
margin of the pro-thorax.
Ampulla-like: flask-shaped; applied to a vascular sac at base of
antennae which aids in the blood circulation of head and its
appendages.
Amygdaliform: almond-shaped.
Anabolic: the constructive change from food material to animal tissue:
see katabolic.
Anal: pertaining or attached to the last segment of the abdomen; the
point or angle of any wing or other appendage that is near to or at any
time reaches the tip of the abdomen.
Anal angle: on the secondaries is that angle nearest the end of the

abdomen when the wings are expanded: the angle between the inner
and outer margin of any wing; = hind angle of primaries.
Anal appendages: generally; applied to the external genital parts.
Anal area: Orthoptera and Neuroptera; the hinder or anal portion of a
wing within the anal vein = axillary area.
Anal cells: the spaces between the anal veins (Comst.): in Diptera, anal
cell (Will.), the space nearest the body, inclosed by the 5th and 6th
veins sometimes called the third basal cell (Coq.) = 1st anal (Comst.).
Anal field: Orthoptera; that area on the tegmina corresponding to the
anal area of the secondaries.
Anal filaments: see caudal setae.
Anal fork: applied to the cerci of Coleopterous larvae.
Anal foot: applied to the tip of the body in larval Chironomids, which is
modified to serve as a hold-fast.
Anal furrow: in wings, lies between the cubitus and 1st anal vein.
Anal glands: appendages of the alimentary canal, opening into it near
the posterior extremity, secreting either a lubricant, a silk-gum, or some
other specialized material.
Anal horns: in Collembola, are small processes borne on the last
abdominal segment.
Anal lobes: in Lecaniinae, a pair of small, triangular, hinged processes
forming a valve which covers the anal orifice.
Anal loop: Odonata; the loop formed by the angulations of 1st anal
vein.
Analogous: similar in function; but differing in origin and structure: e.g.
the wings of birds and insects: see homologous.

Anal operculum: the dorsal arch of the 10th abdominal segment; in
caterpillars = supra-anal plate, q.v.
Anal organs: Collembola; the two modified hairs arising from a
tubercle ventro-cephalad of the anus and usually curving caudo-dorsad.
Anal orifice: see anus.
Anal papilla: Collembola; see anal tubercle.
Anal plate: in caterpillars, the shield-like covering of the dorsum of the
last segment: in the embryonic larva the 11th tergite.
Anal ring: a chitinous ring encircling the anus in many Coccidae.
Anal scale: one of the lateral processes of the ovipositor in Cynipidae,
lying outside and below the lateral scale.
Anal siphon: the anal breathing tube of Culicid larvae.
Anal style: a slender process on or within the terminal segment of the
abdomen in Homoptera.
Anal tubercle: Collembola; the tubercle bearing the anal organs: = anal
papilla.
Anal tubercles: a pair of prominent, rounded or conical processes,
situate one on each side of the anus in certain Coccids.
Anal valves: see podical plates.
Anal veins: those longitudinal unbranched veins extending from base to
outer margin below the cubitus; the first anal, also termed vena
dividens, q.v., is the 6th of the series starting from the base, and it may
be followed by several others which are numbered in order to the inner
margin.
Anastomosing: inosculating or running into each other.

Anastomosis: a running together;