iro 



DictyopJiorodelpJiax. Dr. R. C. L. Perkins revised the 

 family in his interesting Introdnction to the Fanna Ilawa- 

 iiensis in 1913. Notes on captnres and life histories have 

 appeared in the Proceedings of this Society at various times 

 (1905 to date). These references, along with this present 

 paper, constitute the whole of the literature of the antochtho- 

 nous genera of the Hawaiian Delphacidae. 



In dividing the species into genera Kirkaldy used charac- 

 ters already in nse in continental areas and gave them the 

 same values. An examination of the male genitalia discloses 

 the fact that this system brings together heterogenous forms 

 and separates several allied forms. By using the size of the 

 first joint of the antennae, instead of the condition of the 

 frontal carinae, for primary divisions these forms are brought 

 together. Leialoha and Nesodryas have the first joint cf an- 

 tennae very short and wide, and are composed of very closely 

 allied forms, whereas the rest of the Aloli'nii have the first 

 joint longer than wide and form a larger group of allied 

 forms containing several well-defined smaller groups, the exact 

 relationship of which it is difficult to decide. In the table 

 of genera Proterosydne is included, as it is the only foreign 

 genus of the tribe, with one American and one Australian 

 species. For specific characters the ultimate appeal is made 

 to the external male genitalia. Owing to the variability of 

 color in many species and the tendency of the females to im- 

 maculacy, the females of many species are difficult to sepa- 

 rate. For this reason I have refrained from erecting new spe- 

 cies on females, although there are several in the collections 

 that are undescribed. One specimen collected by Swezey at 

 N^ahiku, Maui, has a single frontal carina, but otherwise it 

 is identical with N esorestias ; thus it constitutes another genus. 



Kirkaldy's sub-genus Leialolia I have separated, as a 

 genus, from AJolia. leaving the latter with ipomoeae and myo- 

 poricola and placing with them Nesopleias artemisiae, N. da- 

 bautiae and several new species. Nesopleias nimbata I have 

 placed under N esorestias. as they only dift'er in the greater 

 reticulation of tegmina, a character I do not consider as of 

 generic value. The difference between Nesodryas and Neso- 

 tlioe is, at most, only of sub-generic value; the type of the 

 former (N. freycineilne) is not typical of the other species, 

 but is an extreme foi-m, either divergent or convergent. 



While workinii' on material from the Hawaiian Islands 



