J. W. H. Harrison 



23 



Bursa copulatrix itself is a small bag or pouch, sub- globular in shape. 

 At one part of its inner surface it becomes heavily chitinised and a 

 structure formed like a flint arrow-head is evolved. To this I gave the 

 name " Sagitta " ; simultaneously, Pierce termed it the " Signum." As 

 Pierce's name has priority in publication it will have to be adopted. 



Genital structures of the intersexes. 



(1) Wing parts, PI. I, Fig. 1. Genitalia, Text-fig. 3. 



As might have been anticipated from an inspection of its external 

 features this specimen displays in its genitalia a much greater develop- 

 ment of male organs than do the others. Practically every male structure 

 superimposed on, or fused with, those of the female is to be recognised. 



Fig. 3. 



B = Bursa copulatrix. C = Cornuti. DD = 1st pair of directing rods. 



D'D' = 2nd pair of directing rods. G = Gnathos. R = Duplicated 



8th abdominal segment. fif = Signum. F,F'= Valves. F£ = Vesica. 

 Z7= Uncus. L" = another portion of uncus. 



