Coec.u.m: a blind sac or tube: applied to a series of appendages opening into the alimentary ca.n.a.l at the junction of the gizzard and chylific ventricle: see caec.u.m; the two are used interchangeably.

Coeloblast: the endoderm in the narrower sense.

Coelom: the body cavity.

Coelomic cavity: the s.p.a.ce between the viscera and the body wall.

Coelom-sac: the cavity containing the viscera: in embryology one of a pair of closed sacs, arising in the mesoderm of each segment of the embryo and giving rise to more or less of the coelom of the adult.

Coenogonous: oviparous at one season of the year, ovoviviparous at another, as in Aphididae.

Coeruleus -eous: sky-blue: see caeruleus.

Coincident: when two wing veins run together or lie, one in continuation of the other so as to appear like one.

Coleoptera: sheath-winged: an order with the primaries coriaceous, used as a cover only, meeting in a straight line dorsally; mouth mandibulate; pro-thorax free; transformation complete: the beetles: the term has also been applied to the two elytra together.

Collar: in general any structure between the head and thorax: specifically, in Hymenoptera, the neck; in Diptera, may mean the neck, the sclerites attached to the thorax, the thorax itself, or its processes (ante furca): in Coleoptera, is the narrowed thorax; in Lepidoptera, applied to the sclerites attached to the thorax and which shield the neck.

Collembola: an ordinal term applied to species which are apterous; have no metamorphoses; have variably developed abdominal saltatorial appendages and a peculiar ventral tube at base: the spring-tails.

Colleterial gland: see Colleterium.

Colleterium: a glandular structure accessory to the oviduct, secreting the viscid material used in cementing the eggs together.

Colloph.o.r.e: the sucker-like organ extended from the underside of the abdomen in Collembola.

Collum: the neck or collar: the slender connection between head and thorax in Hymenoptera and Diptera; in Coleoptera, the posterior, narrow part of the head or even the thorax: loosely used.

Colon: the large intestine; that usually enlarged portion of the alimentary ca.n.a.l before the r.e.c.t.u.m.

Columella: a little rod, pillar or central axis.

Columnar: cylindric, but tapering toward one end.

Comate -us: only the upper part of head, or vertex, covered with hair.

Commensal: one who eats at another's table: applied to species that feed on the surplus supply of another, without destroying the owner of the supply.

Commensalism: applied to this manner of living and eating together.

Comminute: to grind up fine: to reduce to minute particles.

Commissure: the nerves connecting two ganglia: the point of meeting or union of two bodies: a bridge connecting two bodies or structures; e.g. tracheal tubes.

Common: of frequent occurrence: occurring on two adjacent parts: a band or fascia is common when it crosses both primaries and secondaries.

Communal: applied to life or dwelling in colonies like ants and bees.

Comose: ending in a tuft or brush.

Complanate: compressed: flattened above and below: = deplanate.

Complemental: applied to s.e.xed forms in the Termitidae, capable of reproduction, but which do not reach the winged stage; the females are less fertile than the forms that become winged and several may be used in one nest to replace a lost queen or mature female.

Complicant: when one elytron extends over the other and partially covers it.

Complicate: longitudinally laid in folds: intricate as opposed to simple.

Component: one part of a combined whole.

Compound: made up of many similar or dissimilar parts.

Compressed: flattened laterally.

Concatenate: linked together in a chain-like series.

Concave: hollowed out; the interior of a sphere as opposed to the outer or convex surface: concave veins are those that occupy the bottoms of troughs or grooves on the upper surface of a wing; see convex veins.

Concavo-convex: hollowed out or concave on one surface, rounded or convex on the other; like a small segment of a hollow sphere.

Concentrated: gathered together at one point; intensified or strengthened by evaporation.

Conchate: applied to the sh.e.l.l-like inflation of the auricle in the cephalic tibia of Orthoptera.

Concinne: neat; fine.

Concolorous: of the same general color.

Concretion: a ma.s.sing together of parts or particles.

Concurrent: applied to a vein which arises separately, runs into another and does-not again separate.

Conduplicate: doubled or folded together.

Condyle: a process which articulates the base of the mandible to the head: in general any process by means of which an appendage is articulated into a pan or cavity.

Confertim: closely cl.u.s.tered or crowded.

Conflect: crowded; cl.u.s.tered; opposed to spa.r.s.e.

Confluent: running together; as of two macula when united in one outline.

Confused: a marking with indefinite outlines: a running together as of lines and spots without definite pattern.

Congener: a species belonging to the same genus.

Congeneric: applied to a species agreeing in all characters of generic value with others compared with it.