WINGS OF INSECTS. 53 



it is of some use to attend to these, in describing the 

 wings, I shall point out the principal areas, premising 

 that a wing may ,be said to have a base ( ! ), where it is 

 joined to the corselet; an upper edge( 2 ) running from 

 the base to the fore tip( 3 ), an outer edge ( 4 ) running 

 from the fore to the hind tip ( 5 ), and a lower edge ( 6 ) 

 from the hind tip to the base. 



What may be termed the upper area ( 7 ) is the space 

 inclosed between the mid rib with its branches and the 

 upper edge. 



The space inclosed between the mid rib and the 

 inner rib, with its branches, may be termed the mid 

 area. In butterflies( 8 ), this space is somewhat oblong 

 and triangular, without any cross ribs. 



The space inclosed between the mid rib and the 

 lower rib, or between the lower rib and the under 

 edge, may be termed the lower area ( 9 ). 



The irregular space, occupying the outer edge; 

 all the wing, indeed, not included in the three other 

 areas, may be termed the outer area ( 10 ). 



These several areas are further divided into smaller 

 areas, or, as they may well be called, meshes, which 

 form beautiful lace-work in the dragon flies and 

 others of the same group. 



According as they are in the base, the middle, or 

 the outer edge, these may be termed base meshes( H ), 

 mid meshes( 12 ), and outer meshes( 13 ). 



The other parts of a wing necessary to be at- 

 tended to in descriptions, are chiefly coloured mark- 

 ings, particularly on the wings of butterflies, such as 



(1) In Latin, Basis. (2) In Latin, Margo anterior. 



(3) In Latin, Apex anterior. (4) In Latin, Margo exterior. 



(5) In Latin, Apex inferior. (6) In Latin, Margo inferior. 

 (7) In Latin, Area superior. (8) In Latin, Area media. 

 (ft) In Latin, Area inferior. (10) In Latin, Area exterior. 

 (11) In Latin Cellula basilares. (12) In Latin, Cellula mediae. 

 (13) In Latin, Cellules exterior es. 



