( Ix ) 



resemblance of the pupae to the cold-touched leaves of winter 

 instead of the luscious greenness of the leaves and pupae of 

 the wet season. This was even more marked in a brood of 

 P. demodocus, Esp., that I reared at the same time. 



At Prof. Poulton's suggestion that a cross between a Chirinda 

 insect, with hippocoon predominant in its ancestry and a 

 Natal individual, bearing perhaps equally strongly a cenea 

 tendency, would be interesting, I sent to Mr. G. F. Leigh, 

 packed rather loosely and enclosed in a perforated tin, 

 a few pupae from (if I remember rightly) Family T. Though 

 he failed, I believe, to mate them with Natal individuals, 

 it is interesting to record that those which did not emerge 

 en route survived the journey. Perhaps we may be more 

 successful in the actual crossing next time. 



Finally I wish to thank Prof. Poulton very warmly both 

 for putting me on to so fascinating an experiment and for his 

 continual encouragement. It is an experiment that I intend 

 to repeat with more material and greater precautions on my 

 return to Africa. Not only must the experiment be regarded 

 as purely his, but all work in connection with the butterflies 

 since they reached England and the work of compiling the 

 lists that follow, have been done in the Hope Department. 



The families are arranged in two tables onpp.lxi,lxii. In the 

 first, containing 18 hippocoon parents and their offspring, only 

 the inclusive dates of emergence from the pupa are given. 

 In the second table, containing the family of one liippocoon 

 parent and those of four parents of other forms, the dates 

 of emergence are set down in detail. It is thus possible to 

 trace the relationship between the emergence of the different 

 female forms in the same family. The families included in 

 the second table also show the tendency of certain pupae in 

 a family to lie dormant for a considerable period, so that 

 emergence is postponed, as already explained on p. lix. 



The reference letters follow the order in which the female 

 parents were captured. 



Females in some of the families tabulated above possess 

 vestigial tails to the hind-wings in an unusual degree. They 

 are especially well developed in Families D, E, and V. It is 

 possible that the appearance of these ancestral structures 



