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XVIII. An Intersex of Amorpha populi. Ev E. A. 

 Cockayne, M.A., D.M., F.R.C.P., F.E.S. 



[Read November 15th, 1916.] 



The specimen was sent to me for dissection by Mr. L. W. 

 Newman, who had noticed that although the head, thorax 

 and wings appeared to be male, the abdomen was full and 

 rounded like that of a female. 



Dissection showed that the testes were large and lobu- 

 lated, the four follicles of the two testes forming a cluster ; 

 whereas normally the two testes are fused and the eight 

 follicles twisted spirally assume an almost spherical form. 

 In the abnormal specimen the eight follicles were white, but 

 in normal specimens the capsule of the fused organs is 

 a deep yellow colour. Careful measurement showed that 

 the calices, vesiculae seminales and vasa deferentia were 

 broader and the glandulae accessoriae broader and shorter 

 than in a number of normal males. Serial sections taken 

 through the whole organ showed numerous spermatozoa 

 and some spermatocytes in all the follicles, and in some 

 there were a few objects, which appeared to be large cells 

 with deeply stained basophile nucleus and cytoplasm. 

 These were kindly examined by Dr. Goodrich, who thinks 

 they are probably masses of spermatozoa closely crowded 

 together, but they may be abnormal cells. The external 

 genitalia were mounted and measured. The penis and uncus 

 were both shorter and broader than in normal males, the 

 gnathus, 10th abdominal sternite, was very short and broad, 

 and ended bluntly instead of tapering gradually. It was only 

 about half the length of a normal scaphium. The valves 

 were not evenly spread, but they were of normal length. 

 The cornuti on the vesica of the penis were fewer than 

 normal, about forty-five small and large were counted. 

 The normal penis has about fifty-six. No minute cornuti 

 were seen at all, though they are usually numerous. Plate 

 XCV, fig. 1, shows the internal organs of a normal male, 

 fig. 2 shows those of the abnormal individual. 



The chief interest of the specimen lies in the fact that 



TRANS. ENT. SOC. LOND. 1916. — PARTS III, IV. (APRIL '17) 



