134 FAUNA HAWAIIENSIS 



Hawaii, Molokai 7 



Hawaii, Oahu 3 



Maui, Lanai 2 



Maui, Lanai, Molokai, Kauai i 



Maui, Molokai i 



Maui, Molokai, Oahu i 



Maui, Molokai, Oahu, Kauai i 



Maui, Molokai, Kauai i 



Maui, Oahu, Kauai i 



Maui, Kauai 2 



Lanai, Molokai 2 



Lanai, Molokai, Oahu i 



Lanai, Oahu i 



Lanai, Oahu, Kauai i 



Molokai, Kauai 2 



Oahu, Kauai 4 



These figures do not seem to lead to very much. The high percentage of pecuHar 

 species in Hawaii and Kauai is apparently only what might be expected from their 

 position at the extremities of the group, since interchange of species proceeds in 

 their case on one side only, whilst in the intermediate islands it proceeds on both 

 sides. 



There are certain well-marked instances of representative species in the different 

 islands. Thus in Scoparia there are six species (nos. 7 — 12) which are easily 

 distinguishable from all the rest by the entire black subterminal fascia, yet also 

 separated by well-marked characters from one another ; five of these are confined 

 respectively to the five islands Hawaii, Maui, Molokai, Oahu, and Kauai ; the sixth 

 is a Kauai species, but differs from all the other five in being yellow instead of white. 

 Scoparia habnaea is the Kauai representative of S. vieristis. Orthoniecyna alloptila, 

 chrysophanes, and aibicaudafa are mutually representative in Hawaii, Kauai, and Lanai 

 respectively. O. exigiia, which occurs in Hawaii, Maui, and Molokai, is represented 

 in Lanai by O. ctipreipennis, and in Kauai by O. mesochasrna. Scotoiythra aruraea, 

 from Hawaii, is represented in Oahu by O. caryopis, in Kauai by O. isospora, and 

 probably in Maui by O. corticea. 



On the other hand there are some curious instances of allied species, which might 

 have been expected to belong to different localities, but which are found occurring side 

 by side. Such for example are the two species of Sisyrophyta, which are very similar 

 except in the peculiar secondary sexual characters of the males, the females being 

 superficially almost indistinguishable ; both of these are common in the same localities 

 in Hawaii, though it is true that one also occurs in Molokai. So also Scoparia 

 struthias, triacma, and ciyerodes, which are so similar that I took them at first for 

 one variable species — perhaps I should add that there is really no doubt of their 

 distinctness — all occur commonly together in the same locality, and are confined to 

 the same island. Omiodes demaratalis and monogramma are another very closely 



