FORM TERRA 251 



male form hobieyi already discussed. In the centre of 

 Uganda a few forms are found which, in the case of the 

 male, become the predominant form to the west, in the 

 case of the female become the predominant form to the 

 east. In each case the alteration between the proportions 

 of the forms coincides with the different proportions of 

 the Planema models on the west and east sides of Uganda. 



Another form that was described by Neave in 1904 

 from the collection made by C. A. Wiggins in the environs 

 of Entebbe is known as terra. (Plate I, figs. 1, 2.) 



This form is monomorphic, male and female alike 

 showing a rich orange pattern on a brownish-black ground, 

 mimicking to an extraordinary degree of perfection the 

 abundant Planema tellus eumelis, which is also mono- 

 morphic, although its West African form has a black and 

 white form of female as well. The pattern of the form 

 terra is much like that of the male eurytus, save that 

 the subapical and inner marginal orange areas on the 

 for£ wing are more extensive : the colour, however, is 

 a much lighter orange. But forms of terra with con- 

 tracted fore wing areas are quite common on the islands, 

 and one such, mentioned previously, that was taken in 

 1919 on the Kyagwe coast in an isolated area of forest, 

 had such dark brownish orange colour that it was prac- 

 tically indistinguishable from a typical male eurytus from 

 the West Coast. In terra there is no basal aposematic 

 umber-brown triangle on the under side of the hind wing, 

 and this is absent from the model Planema tellus also. 

 The form terra is found from Uganda to the West Coast. 



I consider it to be the most perfect mimic of all the 

 forms of eurytus that I have seen alive : in pattern and 

 colouring it approximates so closely to the model tellus 

 that I have been deceived by it over and over again. 



On the islands many variations have been found, 

 showing some very distinct patterns and transitions to 

 other forms. A common variation is reduction in breadth 



