332 GLOSSARY OF TERMS USED IN ENTOMOLOGY 



Costa. An elevated ridge that is rounded at its crest; the thickened 

 anterior margin of a wing. 



Costal area. The area behind the costal vein. 



Costal cell. The area inclosed between the costal and subcostal 

 veins. 



Coxa. The basal segment of the leg. 



Coxal cavity. The opening or space in which the coxa articulates. 



Crenate. Scalloped. 



Crepuscular. Active at dusk. 



Cristate. Crested. 



Dentate. Toothed. 



Dentate-serrate. Tooth-serrated: the denticulations themselves 

 being serrated on then- edges. 



DicHOPTic. Eyes separated by front, not contiguous. 



DicHOTOMOus. Forked, dividing by paii's. 



Dimorphic. Occurring in two well-marked forms. 



Dimorphism. A difference in form, color, etc., between individuals 

 of the same species, characterizing two distinct types. 



Dioecious. Having distinct sexes. 



Discal. On or relating to the disk of any surface or structure. 



DisTAD. Toward the distal end. 



Distal. That part of a joint farthest from the body. 



Divergent. Spreading out from a common base. 



Dominant. A character more constant and conspicuous than any 

 other. 



Dorsad. Toward the upper surface. 



Dorsal. Of the back. 



Dorsum. The upper surface. 



Drone. The male bee in Hymenoptera. 



Ecaudate. Without tails or tail-like processes. 



EcDYSis. Moulting or casting of the skin. 



Ecology. The science of the relation of organisms to each other 

 and to their surroundings. 



EcTAD. Extending outwardly from within. 



EcTAL. Relating to the outer surface. 



Elytra. The anterior leathery or chitinous wings of beetles. 



Embolium. The narrow sclerite extending along the anterior margin 

 of the hemelytra, from base to cuneus or membrane, in Heteroptera. 



Empodium. The small process between the pulvilli in Diptera. 

 The bifid pseudotarsi between the claws in Coleoptera. 



Ensiform. Sword-shaped. 



Entad. Extending inwardly. 



Ental. Pertaining to the centre of the body cavity. 



Entire. With an even, unbroken margin. 



Entomogenous. Growing in or on an insect. 



Entomophagous. Insect-feeding. 



Episternum. The anterior and larger lateral thoracic sclerite 

 between the sternum and notum. 



Epizoa. Insects that infest the body surface of animals. 



Ergatoid. Wingless ants, sexually developed. 



