J. W. H. Harrison 27 



A further loss of the male element is here encountered. The ovi- 

 positor tip is very nearly normal but it still carries in the median line 

 a small, but rather perfect, uncus. 



Of the two upper directing rods, the left is as usual, but the right 

 is interrupted by the sudden appearance of male valves attached as 

 a sort of appendage to the penultimate ovipositor segment. Of these 

 two valves, the right is reduced in size although otherwise structurally 

 perfect ; the left, on the contrary, seems larger and distorted. 



Between them appears the penis, the vesica of which, in this instance, 

 bears no coniuti. 



Immediately beneath these male valves is the continuation of the 

 fractured rod. 



The ostium bursae, ductus bursae, and signum now approach the 

 normal, and the duplication of the 8th segment is almost, but not quite, 

 avoided. Whilst the 8th female segment is practically uninterfered 

 with, some trace of the male influence can still be seen in the extra- 

 ordinary retention of the two tubercles which characterise the external 

 male pupal genitalia. 



Although slightly weakened, the lower pair of rods are much the 

 same as in a pure bred insect. 



(4) Wing parts, PI. I, Fig. 3. Genitalia, Text-fig. 6. 



Once more the ovipositor lobes are normal and yet we have grafted 

 on them, as it were, detached portions of the uncus, one of which 

 resembles that described in studying the creatures already considered. 

 The other is a very small isolated fragment situated on the left. Whilst 

 the usual pair of 10th segmental rods are almost as usual, matters are 

 complicated by the development of a single male valve to the right of 

 the ovipositor. In normal Lepidopterous males the valves are hinged 

 or attached on either side near the articulation of the tegumen. There 

 being no tegumen here, unless a somewhat thickened area in the ovi- 

 positor ranks as such, we have nothing to which to articulate the 

 anomalous valve. This difficulty seems to have been avoided in the 

 building up of the hybrid insect by the advent of an extra directing 

 rod which forms the base of the valve, and then passes anteriorly as a 

 fifth rod. 



At the base of the ovipositor appears a sac, in which can be seen 

 chitinous plates armed with huge masses of long stout hairs ; these are 

 the male valves which, for some reason, fail to reach the external surface 

 and lie free in the abdominal cavity. 



