INTRODUCTION 



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the complicated post-costal area to a greater or less extent. Some division of the 

 cellules generally occurs in the large species A. kauaiense, on one side or the other, 

 or in one or other pair of wings (fig. i a, i b, post-costal area of right and left front-wing). 

 A large example of A. deceptor, as will be seen from fig. 2, has the post-costal area 

 between the 7th and i6th cellule considerably complicated by division, though typically 

 this species has a simple row of post-costal cellules. A small race of A. callipkya 

 (named van microdemas by me) is found on Hawaii. A dozen examples, taken at 

 random and examined, all have a simple row of post-pterostigmatic cellules (fig. 4a and 

 4b) in both front and hind wings, whereas a dozen examples from Molokai, Lanai, 

 and Maui, nearly all have this area more or less complicated by division of cellules 

 (fig. 3a, 3b). In some of the smallest species of the genus the post-pterostigmatic and 

 post-costal areas rarely, if ever, show any tendency to duplication of their cellules. 



Fig. I a. 



2 



Fig. I b. 



Fig. 2. 



Fig. 3 a. 



Fig. 3 b. 



Fig. 4 a. Fig. 4 b. 



In many of the red-bodied species a tendency to melanochroism is a common form 

 of variation. This tendency is particularly noticeable in individuals found in certain 

 localities. In dealing with the three large, allied species, A. blackburni, oceanicum, and 

 heterogamias, I remarked that the females of the latter were easily distinguished from 

 those of the other two by the fact that the abdomen was not at all red, but entirely 

 dark. At the time, I had seen a large number of examples of each of these species. 

 Subsequently, however, I found that in other localities on Oahu (to which island it 

 is confined) A. oceanicum also had a female entirely lacking the conspicuous red colour 

 of part of the abdomen, and further in some localities this form much predominates. 



Still later, on the island of Hawaii similar dark-bodied females of A. blackburni 

 were observed, whereas those previously taken there (though in other localities) were 

 red-bodied, as were all those found on the islands of Maui, Lanai, and Molokai. 



F. H. I. z 



