S40 



THE DIPTERA 



Frl 



mi. 



Fig, 432. — Diagram of a Tsetse-Fly. 

 (Modified after Austen, from ' Monograph of Tsetse-Flies.') 



He., head; Th., thorax; Ah., abdomen; Fv. I., front leg; Mi. L, middle 

 leg; Hi. I., lund leg; Pr., proboscis ensheathed by the palpi; Ar., arista; 

 Fr., frons; Oc, occiput; By., eye; Sc., scutellum; Ha., haltere; Sq., squama; 

 Wi., wing; Fe., femur; Ti., tibia; Ta., tarsus. 



Venaiion of Wing. — la, Subcostal or auxiliary vein; la, ib, two portions 

 of the costal cell divided by the humeral transverse vein; ic, subcostal cell; 

 I, radius i, or first longitudinal; 2, marginal cell; II, radius 2 and 3, or second 

 longitudinal; 3, submarginal cell; radius 4 and 5, or third longitudinal; 

 8, first basal cell; 5, first posterior cell; A, anterior transverse vein; IV, media 

 or fourth longitudinal; 9, posterior basal cell; 4, discoidal cell, external to 

 which is the second posterior cell, without a number; B, posterior transverse 

 vein; C, anterior basal vein; V, cubitus i and 2, or fifth longitudinal; 

 D, posterior basal transverse vein; 10, posterior basal cell; 7, third posterior 

 cell; VI, anal or sixth longitudinal. 



and outwards to join with the posterior transverse vein, when it 

 again turns and runs obHquely forwards to join the costal vein just in 

 front of the tip of the wing. Between it and the radius 4 and 5 (third 



