EXPLANATION OF SOME TERMS. ' 175 



EXPLANATION OF SOME TERMS. 



Other words are explained by the context. 



Acutangulate: forming less than a right angle. 



\nal angle (of the wing) : see Figure, p. 60. 



Antennae (of the butterfly) : the two long slender rods pro- 

 jecting from the top of the head. 



Armature (of the legs) : the corneous attachments or ap- 

 pendages, spines, claws, etc. 



iVtavistic : pointing backward to ancestry. 



Bifurcate : with two prongs. 



Blind (said of ocelli on wings) : with no pupil. 



Border and Margin are used interchangeably. 



Cell, or Discoidal cell: see Figure, p. 60. 



Coronal: at the summit. 



Corneous : of a horny texture. 



Costa or Costal margin : see Figure, p. 60. 



Costal vein : see Figure, p. 60. 



Crenate : wavy or scalloped. 



Crenulate : the same, but to a less degree. 



Cycle : regularly recurring series. 



Denticulate: covered with tooth-like points, or with a 

 toothed margin. 



Dimorphic : appearing under two distinct forms. 



Discal dash or stigma: a small spot (peculiar to the male 

 of some Hair-Streaks and Skippers) on the fore wings, 

 at the end of the cell. 



Discoidal cell : see Figure, p. 60. 



Disk : central portion of the wing. 



Dorsal shield (of the caterpillar) : the thickened plate on 

 top of first thoracic segment. 



Emargination : a notch or rounded excision. 



