138 FAUNA HAWAIIENSIS 



the black orbicular dot and straight pale second line being faithfully reproduced. This 

 species is from Maui, and I have no record of O. demaratalis from that island, yet as it 

 is one of the commoner species, and is known from Hawaii, Oahu, and Kauai, it does 

 probably occur in the other islands as well. 



In each of these three cases the supposed mimicking species is apparently com- 

 paratively scarce, and the mimicked one undoubtedly common. But there is at present 

 no evidence to show that the latter is in any way distasteful or otherwise protected, 

 without which the proof breaks down ; future collectors are therefore invited to 

 experiment in this direction. It must be remembered that it is also quite possible that 

 the members of each pair of similar species are coloured alike merely in similar 

 adaptation to identical surroundings. 



Dorsal scale-projection of forewings. 



Finally, I may note that in many of the Pyraustidae there is an unusual tendency 

 to increased development of the dorsal scale-projection towards the base of the fore- 

 wings, which is normally inconspicuous. In some species it becomes so prominent 

 that I at first thought it might be of value as a classificational character ; but finding 

 that it occurred in various genera, yet was often conspicuous in one and obsolete in 

 another of closely allied species, I was forced to the conclusion that it was of no 

 importance as a test of relationship. It is therefore probably an adaptive modification, 

 depending on external circumstances. 



§ 2. Systematic account of the Macrolepidoptera. 

 CARADRININA. 



CARADRINIDAE. 



Leucania Ochs. 



Head rough-scaled. Eyes hairy. Antennae in c/ ciliated. Thorax with or 

 without slight anterior crest. Abdomen not crested. 



1. Forewings with first and second lines entire 2. 



,, „ reduced to dots or obsolete 5. 



2. First line very oblique, to about middle of dorsum 3. 



„ not very oblique, to about f of dorsum 4. 



