12 



THE BOOK OF THE FLY 



il writers give troublesome technical names, not 

 nearly so intelligible as the nomenclature symbols of 

 the late Rev. \V. J. Wingate, explained in the Appendix 

 herewith. For present purposes a simple observation 

 of the (externomedial) vein " V, 4," where it is the 

 lower boundary of the (subapical) cell "O, 4 2 ," will 

 suffice. 



The pattern of 

 the first figure illus- 

 trates the wing of 

 x ^ ^ _ ' the common blue- 



fOjv 8\ 5 X -:,^^ V bottle ;here"vein 4" 



Muscm does not run at all 



straight in the last 

 part of its course, but 

 curiously ben ds very 

 suddenly upwards 

 at an angle and 

 meets the margin 

 very near to "vein 

 3." In the wing of 

 a large blue-bottle 

 it will be easy to 

 recognise this plan. 

 The pattern of 

 the second figure is 

 rather similar, for 

 the vein 4 likewise 



Con RIGHT has a sudden bend 

 Fig. 3. Wing patterns contrasted. upwards ; it ter- 

 minates practically contiguous with vein 3 at the 

 margin. This pattern is characteristic of the " house- 



Mvscm 



