( 9 ) 



occur together in one race or in different localities as different 

 races, though in the latter instance it might be difficult to say 

 whether we have a dimorphic species, or two distinct geograph- 

 ical races either of which should present traces of the common 

 xii] 



ancestor but not of the other form. The conclusion from 

 Col. Manders' experiments therefore was that if chrysippus and 

 dorippus are geographical races and not dimorphic forms 

 dorippus is the essential form, if they are dimorphic forms 

 similar experiments with dorippus should yield specimens with 

 some definite chrysippus aspect. 



Wednesday, March 6th, 1912. 



Three families of P. dardanus, Brown, bred from 

 hippocoon, F., females in the Lagos district by W. A. 

 Lamborn. — Professor Poulton exhibited the first of these 

 families and a part of the second. He stated that these three 

 families were the first successful attempt, outside Natal, to 

 breed P. dardanus from a known female parent. In the 

 Durban district the form cenea had always predominated in 

 the female offspring bred from a hippocoon parent, while in 

 the Lagos district the female offspring of hippocoon were 

 themselves always hippocoon in all three families bred by 

 Mr. Lamborn, — a result which harmonised with the presence 

 ofAmauris niavius, L.,the model of hippocoon, and the absence 

 on the Nigerian coast of all the other Natalian Danaine 

 models of the female dardanus, except Danaida chrysippus, L. 



[xiii 



The following notes and observations on the three families 

 of dardanus had been extracted from letters written by Mr. 

 W. A. Lamborn to Professor Poulton: — 



"Oni Camp, 70 miles E. of Lagos, 



"Nov. 27, 1911. 



" I send all that remains of the female parent of my second 



dardanus family, for I took the female Mona with me while I 



was doing some gardening, and she ran off when my attention 



was occupied and took the butterfly out of its box before I 



