230 Dr. E. A. Cockayne on 



hindwing and 2 and 4 on the right. Even the underside 

 is like that of a male, but the abdomen has no long hairs 

 and has female genitalia (PI. VI, fig. 3). 



Anatomy of Internal and External Genitalia. 



I dissected 26 intersexes and 29 normal females as 

 controls, but most of these came from the same colony 

 and thefe may be more than the average amount of 

 variation amongst them. In every case the external 

 genitalia, ovipositor and rods were normal and no trace 

 of any male structure was found. The prop and rein 

 with the chitinous apparatus for the attachment of the 

 muscles which extrude them were normal. In these 

 respects they agree with intersexes of coridon. 



The bursa copulatrix with its caput was always present, 

 but showed remarkable variations in size and shape. The 

 ductus bursae or seminis was invariably present and 

 normal. The spermatheca was present in all cases and 

 had the two dilated portions found in normal females, 

 but the size and shape of these varied a good deal. The 

 cement glands showed abnormalities in two examples. 

 In one, intersex no. 7, of which the abnormal ovaries 

 are figured, the proximal dilated part of each gland was 

 very narrow and short, that on the right being half and 

 that on the left a third the usual size, the distal tubular 

 part being normal. In another the dilated portion was 

 rather narrow and tapering. In the majority the ovaries 

 were large and contained well-developed eggs. Many 

 showed evidence of having laid eggs and had eggs in the 

 common oviducts and vagina. The eggs in these situations 

 lay with their long axes vertical instead of horizontal as 

 in the egg-tubes. Only three had abnormal ovaries. 



In intersex no. 7, a specimen with a moderate 

 amount of blue scaling on the right fore-wing, there was 

 a small ill-shaped egg with sculptured shell in the vagina. 

 In the left ovary the outer tube had a single well- 

 developed ovum with normal shell, but the yoimger ova 

 above were not nearly so far developed as in normal 

 tubes. In the second tube all the ova were very im- 

 mature. Such a backward development is not found 

 even in newly emerged females, which always have at 

 least two ova in each egg-tube with green contents and 

 sculptured shell. In the third tube the first ovum was 

 aborted and represented only by a few granules. The 



