PLATE II. 



I, .II, III, IV, V, VI, first, second, third, fourth, fifth, sixth 

 longitudinal veins respectively; VII, costa or costal vein; VIII, auxiliary 

 vein; IX, transverse shoulder vein; X, small cross-vein; XI, posterior 

 cross-vein; XII, anterior branch of the third vein; XIII, posterior 

 branch of the third vein; XIV, anterior intercalary vein; XV, anterior 

 branch of the fifth vein; XVI, posterior intercalary vein; XVII, anterior 

 basal transverse vein; XVIII, posterior branch of the fifth vein. 



a, b, c, first, second and third costal cells respectively, or costal cell; 

 d, marginal cell; e, f, first and second submarginal cells respectively; 

 g, h, i', j, k, first, second, third, fourth and fifth posterior cells respect- 

 ively; 1, -discal cell; m, n, first and second basal cells respectively; o, 

 anal cell; p, axillary cell. 



1, anal angle; 2, alula; 3, antitegula; 4, tegula; 5, axillary in— 

 cission. 



The drawing is taken from the wing of Tabanus Stygius Say. 



