48 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. 



Extensa : 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 ex- 

 tension 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 

 metanotum, between the median and lateral longitudinal carinae : = first 

 lateral basal area. 



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

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



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

 Orthoptera; = 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 -urn: 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. 



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 



