426 Mr. W. J. Kaye's Kotcs on the dominant Miillerian 



form and shows no special influence of the main group. 

 Eucidcs isahella, it should be mentioned here as elsewhere, 

 strongly retains the pattern of the abundant 3fechanitis 

 pohjmnia, and this association is probably so ancient that 

 the two species have had time to become fixed and definite. 

 Both these two latter insects occur over a very wide area, 

 and small variations of climate and environment have 

 apparently little or no effect. 



Eucides nigrofulva. 



Of this newly discovered species twenty-five individuals 

 in all have been secured. No less than twenty-two have 

 been females while but three males have been taken. 

 This may indicate that the males and females have 

 ditferent habits, but it may be simply that the males and 

 females emerg-inor at different times and that when the 

 males were out they were either overlooked for something 

 else or perhaps not looked for at all. This latter explana- 

 tion seems to be more plausible when one examines the 

 under-sides of the specimens as remarked on later. The 

 series of females shows considerable transition from a 

 moderately heavy-banded hind-wing, tending to fuse with 

 the dark outer margin, to a fairly narrowly-banded form 

 with no trace of fusion. 



Of the extreme dark form there are four examples, but 

 in no case is the area between the central band and the 

 dark outer margin uniformly black. The males, as will 

 be seen by a reference to the specimen of the insect, have 

 a very much less dark hind-wing, with the black band far 

 more broken up into spots than is ever found in the female. 

 This difference together with the absence of yellow bands 

 to the fore-wing gives the male sex a very different general 

 appearance above. On the under-side, however, except for 

 size, these differences vanish and there is practically no 

 variation in the whole series of either males or females. 

 This is remarkable testimony to the efficacy of selection 

 when the species is at rest. Not only do male and female 

 closely resemble one another on the under-side, but they 

 with closed wings have a remai'kable similarity to the 

 under-side of Heliconius numata, and particularly to the 

 less dark individuals of that species. The series of 

 white marginal spots to the hind-wing, the most in- 

 teresting appearance of a yellow patch of scales beyond 



