Classification: is the systematic arrangement of insects (or other animals or plants) in series showing their relation or agreement in structure, life habits or other characters forming the basis of the "classification." Clathrate: latticed or lattice-like in appearance. Claustrum: the structure uniting the wings in flight, whether by hooks, by a thickening of the margin, or by a jugum. Clava: a club; the enlarged apical joints of a clubbed antenna: = clavola. Claval suture: Hemiptera; at the base of hemelytra, separating the clavus. Clavate: clubbed: thickening gradually toward the tip. Clavate hairs: in Collembola, = tenent hairs. Clavicornia: that series of beetles having the antennae more or less distinctly enlarged or clubbed at tip. Clavicular lobe: Homoptera; that portion of hind wing behind anal veins. Claviform: club-like in form; specifically, in Noctuid moths an elongate spot or mark extending from the t. a. line through the submedian interspace, toward and sometimes to the t.p. line. Clavola: see clava. Clavus: the club of an antenna lava and clavola: in Heteroptera, the oblong sclerite at the base of the inferior margin of the hemelytra: the knob at the end of the stigmal or radial veins in certain Hymenoptera. Claws: the claw or hook-like structures at the end of the foot or tarsus. Cleavage: see segmentation of egg. Cleft: split: partly divided, longitudinally: in Coleopteran applied to claws so divided that the parts lie one above the other. Clintheriform: shaped like a plate. Cloaca: see rectum. Clubbed: see clavate. Clypeal suture: marks the division between clypeus and epicranium. Clypeate: shield-like in form. Clypeate constriction: applied when a surface is drawn in from the sides so as to produce a shield or saddle-like form. Clypeo-frontal suture: = clypeal suture. Clypeus: that portion of the head before or below the front, to which the labrum is attached anteriorly; in Diptera often visible below the margin of the mouth in front, as a more or less visor-shaped piece:= epistoma. Clypeus-anterior: see ante-clypeus. Clypeus posterior: see post-clypeus. Coactus: condensed; of a short stout form. Coadapted: formed so as to work together to one end; as the mandible and maxilla in Chrysopids, etc. Coadunate: joined together at base; two or more joined together; said of elytra when permanently united at the suture. Coagulate: to congeal; to change from a fluid to a jelly. Coagulum: a clotted mass, as of blood. Coalescent: united or grown together. Coarctate: contracted: compacted: applied to that form of pupa in which all the members of the future adult are concealed by a thickened, usually cylindric case or covering, which is often the hardened skin of the larva: beginning with a narrow base, then dilated and thickened. Cocardes: retractile vesicular bodies on each side of the thorax in certain Malachidae. Coccineous: cochineal red; dark red [carmine].