322 UNDER THE AFRICAN SUN 



this year at the Eldoma Ravine, where, on a former journey, you 

 secured the male Papilio rex. Entomologists will be interested 

 to know that this female of Papilio rex does not differ essentially 

 in pattern from the male, except in some details which do not 

 affect very much the general appearance. 



"Among the Heterocera your Satiirniidce are interesting. 

 There is also a fine show of the day-fiying moths belonging to 

 Xanthospilopteryx, including some undescribed forms. Your dis- 

 covery in those regions of a West African Hawkmoth of peculiar 

 appearance, Lephostliethus diimoulini, or a close ally of it, equally 

 deserves to be noticed. 



" Yet, however rich in rare forms your collection is, its greater 

 scientific value, in my opinion, consists, secondly, in your having 

 given the exact date and locality of capture of every specimen, 

 and in your having marked all the individuals you caught in 

 copula. With such material to work with, the entomologist is 

 able to investigate questions of geographical distribution and 

 to study seasonal variation and individual variability ; whereas, 

 unfortunately, many collectors confine themselves merely to 

 recording the country where their specimens were caught." 



