PLATE Ii. 
Po ibests IV. VV, Vi, first; second; third,-fourth, Rith, 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. 
