324 Dr. E. A. Cockayne on 



the left were two valves and harpes rather compressed, 

 the valve and harpe lying internally near the female organs 

 being smaller and more distorted. There was a penis 

 sheath, a narrow but perfect penis and a cingula, perfect 

 on the left side but on the right very thin and soon ending 

 by gradually disappearing in the thin chitin of the female 

 side. On the right side was a small ostium bursae, from 

 which ran a long thin tube, opening into a small twisted 

 bursa copulatrix, with a small curved caput bursae. The 

 directing-rod of the ninth segment was normal in size 

 and shape. 



The condition of the external genitalia in both gynandro- 

 morphs is the same in all important points. 



The gynandromorphous hybrid was perfectly halved, 

 being male on the right side and female on the left. The 

 antenna and palpus of the right side showed perfectly 

 developed male characters, those on the left female (Plate 

 XCIV). The hair on the thorax and abdomen was longer 

 and thicker on the right side, the division being accurately 

 in the middle line. The abdomen was stouter on the left 

 side. 



The wings failed to expand, but those on the right side 

 were darker and the basal patch of the hind-wing was 

 larger and darker on the right side than the left. On both 

 sides the characters were intermediate between those of 

 the two parent species. 



Internally the insect had no male organs, except the 

 lower end of the ductus ejaculatorius, which formed a 

 dilated sac opening into the penis, and there were no 

 female organs except a bursa copulatrix of small size, and 

 a cement gland of most abnormal shape. 



The cement gland had a very narrow duct with an 

 unusually large dilatation in its course, and the gland itself 

 was double, one branch ending in a very small thin tubular 

 part, the other in a tubular portion equally thin but longer, 

 though not nearly as long as that of a normal gland. The 

 duct ended in a mass of chitin near the neck of the bursa, 

 and which probably represented the undeveloped vagina. 



Thus, though the secondary sexual characters of both 

 sexes were perfectly developed, the insect possessed neither 

 ovary nor testis. 



Externally the genitalia showed a perfectly halved con- 

 dition, male on the right side and female on the left. 



There was a small uncus and narrow sickle-shaped 



