group of Butterflies, Fotaro District, British Guiana. 427 



the cell between veins 5 and 7, and three white apical 

 spots on the fore-wing are alike found in both IT. numata 

 and E. nigrofulva, not to mention the general arrangeuaent 

 of bands and colours. 



Eueides isabcUa and Eueides vihilia. 



As already mentioned both of these species have 

 occurred but only singly. E. isahclla is a perfectly 

 normal example. It is remarkable that on the under-side 

 with the wings closed it is hardly to be distinguished from 

 E. nigrofulva except for the smaller sub-apical yellow spots 

 forming a band. The straw-coloured patch of scales be- 

 tween veins 5 and 7 is wanting, and points to a more 

 recent association with the group or at least with 

 Heliconius numata. 



The example of Eueides vibilia is much more removed 

 from the normal and illustrates how this species is assum- 

 ing a darkened hind-wing above. The black scaling of 

 the marginal band shows an extension inwards towards 

 the cell, and this is quite a special development in this 

 species. The sub-apical straw-coloured spots are smaller 

 than in typical examples and follow the pattern E. isahella. 

 It must be confessed that on the under-side this insect has 

 little of the general appearance of the majority of the 

 group. , The strong rayed aspect of the hind-wind without 

 any band gives the insect a much more distinct and dif- 

 ferent-looking appearance. But it cannot be overlooked 

 that the dark suffusion of the hind-wing above is signifi- 

 cant of the influence of the more pronounced black hind- 

 winged species, and this like the Protogordus is probably a 

 resultant of selection for this end made only on the wing. 



YkMILY—DANAIDJE. 



Snb.hmi\y—LYCOEEAN^. 



The two members of the family Danaidx both offer 

 remarkable instances of the influences of colour and 

 pattern. The two species are Lycorea pasinu7itia and 

 Lycorea ceres. The former shows the influence of the 

 darkening tendency in the hind-wing much less than the 

 latter, and this is the more remarkable because in other 



