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EXPLANATION OF TERMS 



Expansio alarum: the wing stretch; see expanse. 



Expiratory: relating to the act of expiration, when the abdomen is con- 

 tracted and the air contained in the abdominal tracheae is presumably forced 



out of them. 

 Explanate: spread out and flattened; applied to a margin. 

 Explicate: unfolded; open; without folds or plica. 



Exsculptate -tus: a surface with irregular, more or less longitudinal de- 

 pressions, as if carved. 

 Exscutellate: having no scutel. 



Exserted: protruded; projecting beyond the body or over a given point. 

 Exsertion: a protrusion: an extension of a line or other ornamentation beyond 



its ordinary course. 

 Extended: spread out: not lying one upon the other. 

 Extense: extended: expanded. 

 Extension plate: a structure at the base of the pulvillus whose function it is 



to extend it. 

 Extension sole: the pad-like pulvillus which may be extended by the extension 



plate through the pressure plate. • 



Extensor: that which extends or straightens out; applied to muscles. 

 Extenuate: to make or to become weak, thin or slender. 

 Exterior: the outside. 



Exterior margin: the outer margin; sometimes used for costal margin. 

 External: belonging to or on the outside. 

 External area: Hymenoptera ; the upper of the three cells or areas of the 



metanotuin, between the median and lateral longitudinal carina: : = first 



lateral basal area. 

 External median area: Hymenoptera; the median of the three cells or areas 



between the median and lateral longitudinal carinse : = second lateral area. 

 Externomedial vein: in Hymenoptera (Norton) = radius (Comst.); in Orth- 



optera; = media (Comst.). 

 Externo-median nerve: the humeral and discoidal veins together. 

 Extra-ocular: remote from or beyond the eyes. 

 Extremity: the point most remote from base. 

 Extrorse-um: toward the outside. 

 Extrude: to turn or force out. 



Exude: to ooze or flow slowly through minute openings. 

 Exuvia -iae -ium: the cast skin of a larval insect: in Diaspince the larval 



skin when cast and incorporated in the scale. 

 Exuviate: to cast the skin; to moult. 



Exuviation: the act of molting: the cast-off skin or exuvium. 

 Eyes: the organs of sight, composed of numerous facets, situated, one on 



each side of the head : the term is properly applied to compound eyes only ; 



but is sometimes used to designate also the simple eyes or ocelli. 



F 



Face or Facies: the upper or outer surface of any part or appendage: the 

 front of the head between the compound eyes above the mouth to the 



