( 42 ) 



" All the species are Odijnerus proper, but very diverse 

 in structure, the little Colour-group of six species, all peculiar 

 to Oahu, representing three very distinct structural groups. 

 There is nothing like them in colour on any other island. I 

 have taken all six at the same spot and time on one occasion, 

 and generally three or four are flying together. 



"Oahu is remarkable for the diversity of its Colour-groups, 

 all being represented, except that the pale- banded forms are 

 not quite like those of Kauai, and t lie eandwioheneie, Croup 

 D, has become the distinct dttbioeue, Group B, above. 



"Colour-group D [= III of Maui, etc.]. — Species very 

 uumeroue and diverse in structure but all are Odynerue. 



"Black, with red markings, wings dark, blue reflections. 

 I have sent two examples : — 



Odynerus petrobiue, Perkins .... Molokai. 

 Odynerus sandtoicheneie, <le Sauss. . . . Maui. 



[lix 



" The wings of the latter are not so blue in some species, 

 but the colour is much deeper when they arc folded. 



"Molokai, Lanai, and Maui are rich in these red-marked 

 forms with dark wine.-. 



"Colour-croup B [ I of all the islands except Kauai]. — 

 This, the mostdominant Colour group, is Mack, wines infuscate, 

 with blue, purple or steely reflections. To see the iridescence 

 at its beet the insects should m>t be looked tit in the box over 

 white paper, but held in the band and viewed from above and 

 in front. The colour of the wings is always conspicuous in 

 life in this group, ;'. 0. \\ hen the insect is flying, but in some it 

 i - less apparent after deal li. 



" For this group I have selected : — 



" DlPLOPTB&A (Eumntidae). 



Odynerus mOfUcmue, >m. ..... Oahu. 



,, nigripennie, llolmgr. .... Oahu. 



Nesodynerus rudolphi, Dalla Torre . . . Oahu. 



Odynerus molokaieneii , Perkins* . . . Molokai. 



* This species is placed by Dr. Perkins in Group II of Molokai, Lanai 

 and Maui (= IV of Oahu), but it certainly seems to tit extremely well 



