20 Mohr. 



Most of the individual, including- the head, the larger part of the 

 thorax, the legs, the left wing and the left half of the abdomen was 

 female and not singed. The eye -colour was red. Both fore -legs were 

 without sex combs. Tj'pical delta -like fields at the marginal insertion 

 of the veins of the left wing indicated that this wing was Notch 8, 

 though notches were not present. That the female parts were Notch 8 

 was also evident from the fact that the small hairs on the female 

 parts of the thorax showed the irregular distribution found in Notch 8 

 individuals. 



The right part of the dorsal side of the thorax and the right half 

 of the abdomen was male and typically singed. Of the bristles the 

 right scutellars, dorsocentrals , postalars, presuturals, humerals and 

 supra alars were all singed. The rest of the bristles, including the 

 right notopleurals and sternopleurals, were wild-type^). 



The abdomen was slightly abnormal, the two anterior abdominal 

 bands having failed to fuse in the mid- dorsal region. While the 

 distribution of male and female parts on the dorsal side was strictly 

 bilateral, the female part exceeded somewhat the mid-ventral line. This 

 was shown by the fact that the small hairs on the ventral plates were 

 wild-type except in a naiTOW strip along the right margin of the anterior 

 plates, where they were singed. The external genitalia were male and 

 singed, but slightly deformed. 



The right wing was smaller fhan the left, but the difference in 

 size was not as pronounced as is generally the case in bilateral 

 gynandromorphs. The longitudinal veins and the wing showed no indi- 

 cations of the Notch 8 character. Hence it may be inferred that most 

 of the wing was male and singed. This assumption was also strengthened 

 by the fact that the small hairs at the end of the wing seemed slightly 

 curled, though it should be remembered that fhe singed character in 

 ordinary singed individuals does not give any clear manifestation in 

 this part of the wing. The two somewhat larger hairs at the distal 

 end of the first section of the costal vein were not singed in the right 

 wing of the gynandromorph. This must mean that the anterior margin 

 of the right wing was female and Notch 8. 



This composition of the wing of a female part along the anterior 

 margin and a larger male part would account for the fact that the 



') The identification of the bristles was kindlj' checked by Dr. Sturtevaut. 



