696 Professor Baphael Meldola [June 7, 



semblance to each other. On the other hand, there were shown the 

 following groups illustrating the general resemblances between the 

 species of protected genera : — 



Three genera of Euploeinse from Malabar and Nilgiris, the mimetic 

 resemblance between which had been recognised by F. Moore. 



Five species of Acrsea from Mashoualand, and another group of 

 two species caught in one day by Mr. Guy A. K. Marshall. 



A large group of butterflies belonging to different Heliconine and 

 Danaine genera, and some moths all converging in general pattern 

 round Thyridia and Methona. 



A group from Guiana showing resemblances between Danainae, 

 Erycinidse and certain Pierinse (possibly a protected group) and 

 between Ithomiinse and Beliconinse. The chief interest of this group 

 was the prevalence of a local peculiarity of colouring, viz. a darkening 

 of the colours of the hind- wing which was apparent in all the families 

 and sub-families furnishing genera for the Miillerian group. 



Pairs of Melinsea and Heliconius and of Titlwrea and Heliconius 

 from various parts of Central America, these pairs being selected for 

 their close resemblance and as being centres of convergence for other 

 Miillerian groups. 



A group of specimens of Anosia plexippus from various parts of 

 North America, together with the mimicking Limenitis archippus and 

 auother species of Limenitis preserving the normal type of colour and 

 pattern of the genus, in order to show how great had been the 

 divergence from the normal type. 



A group showing Miillerian mimicry between the female 

 Bypolimnas bolina, Papilio castor, P. panope, and the Danaine 

 Podemma hollari (both sexes) and Crastis core (both sexes), from the 

 western Ghats, taken by Mr. G. Keatinge. 



The Miillerian principle of mimicry was thus well illustrated by 

 the Lepidoptera both in its broad application to the explanation of 

 general resemblance among protected groups as well as to the more 

 special resemblances between local forms. Although observations 

 concerning other orders of insects were not so numerous as in the case 

 of the Lepidoptera, there was already good evidence of Miillerian 

 associations among such orders. In illustration of this point a group of 

 Aculeate Hymenoptera from Western Australia was shown, a general 

 similarity of colour and marking being observable among species of 

 Abispa, Eumenes, Alastor, Odynerus and Bernbex. A still more 

 remarkable Miillerian group comprising insects of various orders 

 captured in Mashonaland by Mr. G. A. K. Marshall in January 1899, 

 was also shown. The general similarity in this case extended to 

 Coleoptera (Lycidse, Telephoridse, Cantharidse, Melytidse, Phytophaga, 

 Cerambycidse), Hymenoptera (Aculeata, 3 genera), Hemiptera 

 (Beduvius), Lepidoptera (Zygsenidse, Arctiadse), and Diptera. It 

 was perhaps not possible at present to refer each particular case of 

 mimicry to its proper category, Batesian or Miillerian. But if a 

 group round which in some district a number of other groups 



