76 



Oliarus Stal. 



So far as concerns the structure of the legs, the Hawaiian 

 forms all belong to the typical subgenus, but I separate them off 

 under the name Nesoliaru\s, on account of the great plasticity 

 of those characters which are of specific value in the exotic 

 forms, and on account of the sexual climorphism. which is more 

 or less apparent — mostly considerably so — in the pattern and 

 colouring of the tegmina. As it would not be possible to include 

 these Hawaiian forms in a general table of species, ow'ng to 

 the above-mentioned plasticity, it is convenient to group them 

 under a special subgeneric name (t3^pe tameharneha). 



In the europaean fauna, the male genitalia have been exten- 

 sively used in the differentiation of species. T have, however. 

 not been able to do this with the Hawaiian species. The form 

 of the parts is not very evident without dissection, and I have 

 not had sufficient material except in a few species. Moreover, 

 the form of the genital styles (the "clasDers" of Scott), appears 

 to be much the same in all. being not very dissimilar to those of 

 Cixius sfi,^maticns when viewed from below fcf. Ent. ATo. Mag.. 

 VTI, fig. T. p. 203), except that the stalks are straighter. With 

 more material. T mav be able in the future to investigate further. 



The venation, which in the Australian and Fiiian species T 

 found so characteristic, is highly variable in the Hawaiian forms. 

 The place of forking of the radial and brachial veins, and the 

 place of un-on of the two claval veins, which characters seem to 

 be of specific value in exotic forms, are inconstant and of no 

 value here. 



The tabular form under which T now proceed to describe the 

 Hawaiian forms is. T think, sufficient for the present — till I can 

 obtain more material in certain of them — to differentiate them 

 apart from one another: at the same time, it is, in most cases 

 probably, not sufficient to distinguish them from the specie-- of 

 other countries. As, however, the endemic forms here arc not 

 at all likely to occur elsewhere, th^'s will be of little account. 



The Hawa-ian species are usually found among Ferns, Sad- 

 Icria, Cibotumi. Clcichcnia, etc. Swezey (1) has described the 

 nymphs of 0. kaonohi (2). which he found in "decaying leaf- 

 bases and fibrous matter of tree-fern trunks." 



fl). 1907. P. Haw. E. S., I. 83. 



(2). I identifipd this for Mr. Swezey as my koanoa, but the species 

 seem to be different. 



