28 EXPLANATION OF TERMS 



Coelom: the body cavity. 



Coelomic cavity: the space 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 ccelom of the adult. 



Coenogonous: oviparous at one season of the year, ovoviviparous at another, 

 as in Aphid idee. 



Coeruleus -eous: sky-blue: see casruleus. 



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; transformations 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 Hymcnoptera, the neck; in Diptcra, may mean the neck, the sclerites 

 attached to the prothorax, the prothorax itself, or its processes (ante 

 furca) ; in Coleoptera, is the narrowed prothorax; in Lepidoptera, applied 

 to the sclerites attached to the prothorax 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. 



Collophore: the sucker-like organ extended from the underside of the ab- 

 domen in Collembola. 



Collum: the neck or collar: the slender connection between head and thorax 

 in Hymcnoptera and Diptcra; in Coleoptera, the posterior, narrow part of 

 the head or even the prothorax : loosely used. 



Colon: the large intestine; that usually enlarged portion of the alimentary 

 canal before the rectum. 



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. 



