236 THE COLOUES OF ANIMALS 



ample of Mimicry alluded to by Boisduval, although 



he uses different names for the butterflies. The 

 Natal form of Danais niavius is rather different, 

 having broader white markings, especially on the 

 hind wings, and both its mimics have undergone a 

 corresponding change in the same locality. The 

 Natal varieties are represented in figs. 4a and 4. It 

 is very interesting to learn that the two varieties 

 of P. merope which mimic the two species of Danais, 

 although so widely different in appearance, are still 

 connected by intermediate forms. 



A third species of Danais, the conspicuous black, 

 reddish-brown, and white D. chrysippus, is extremely 

 abundant and has a very wide range, occurring 

 throughout Africa, in Southern Europe, Southern 

 Asia, the Malay Archipelago, &c. This butterfly, 

 represented in fig. 5a, is almost everywhere attended 

 by its mimic, Diadema bolina, which occurs in two 

 forms exactly resembling the two forms of the Danais. 

 A third variety of the female P. merope (the P. tropho- 

 nius form), shown in fig. 5, occurs in Cape Colony, 

 and mimics Danais chrysippus. 



The female of P. merope also occurs as a fourth 

 variety, unlike the others, but connected with the 

 second of them by an intermediate form. Mr. Trimen, 

 considers that this variety ' is probably modified, or 

 in course of modification, in mimicry of some other 

 protected butterfly, possibly not a Danais' 



To recapitulate this marvellous instance of the 

 relations which may obtain between the organisms 



