3 6 EXPLANATION OF TERMS 



Demarcation: the bounding, laying out or limiting. 



Dendritic : applied to the branched nerve cells in the mushroom bodies of the 



pro-cerebrum. 

 Dendroid: tree or shrub-like: branching like a tree or shrub. 

 Dendrophagus : feeding on woody tissues. 



Dendrophilous: species that live in woody tissue, or on trees. 

 Dens: a tooth or tooth -like process. 

 Dense: thickly crowded together. 

 Dentate: toothed: with acute teeth, the sides of which are equal and the tip 



is above the middle of base. 

 Dentate-serrate: toothed, with the dentations themselves serrated on their 



edges. 

 Dentate-sinuate: toothed and indented. 

 Dentes: the teeth or pointed processes on the inner side of the mandible: 



the second or middle part of the furcula in Collembola, consisting of two 



parallel pieces from the distal end of the manubrium and bearing at their 



apices the mucrones. 

 Dentes caninae: see canine teeth. 

 Denticle: a small tooth. 



Denticulated: set with little teeth or notches. 

 Dentiform: formed or appearing like a tooth. 

 Denudate: without covering; destitute of scales or hair. 

 Denude: to free from covering; to rub so as to remove the surface covering 



of scales, hair or other vestiture. 

 Deorsum: downward. 

 Dependent: hanging down. 

 Deplanate -us: see complanate. 



Depressed: flattened down vertically; opposed to compressed. 

 Depressor: applied to a muscle that has for its function the depression of an 



organ or a part. 

 Deratoptera; = Orthoptera. 



Dermal: relating to the skin or outer covering. 

 Dermal glands : hypodermal unicellular glands which secrete wax, seta, 



spines, etc. 

 Dermaptera: see Dermatoptera. 

 Dermatoptera: skin-winged: an ordinal term applied to insects with elytri- 



form, abbreviated primaries beneath which the secondaries are folded trans- 

 versely and fan-like: mouth mandibulate, prothorax free; abdomen forcipate ; 



metamorphosis incomplete: the Forficulida or earwigs. 

 Desectus: = truncatus. 



Desideratum -ata: some thing or things needed or desired. 

 Destitutus: wanting; being without. 



Determinate: with well-defined outlines or distinct limits: fixed: marked out. 

 Detonans: exploding: a sudden noise or a puff like an explosion. 

 Detritus: rubbed off; a surface partly denuded. 

 Deuterotoky: parthenogenetic reproduction when the progeny are male and 



female : see arrhenotoky and thelyotoky. 



