85 



these two species existed in the collections in the Territory. 

 The linding' of more specimens of /. oshorni (Miiir) shows that 

 the aedeao-iis of the single specimen from which the species 

 was descril)ed was damaged. The cyathodes group shows some 

 interesting features for here we Lave certain chrootic changes, 

 which in other gr()U])s of Delphacidae are of generic value, 

 while the genitalia remain practically unchanged. 



All the new species show^ as great a phallic differentiation 

 as the old. In this question of phallic differentiation lies the 

 chief problem of the evolution of the Delphacidae, especially 

 of the evolution of species. Work done by ^Ir. Giffard on 

 North American Delphacidae shows the same diversity of th(^ 

 genitalia as I have found among thie Haw'aiian and Oriental 

 species. 



, Mr. Timberlake made dissections and mounts of his own 

 material and that of Mr. Bridwell, and Mr. Giffard prepared 

 mounts and drawings of the material collected by himself, 

 and Messrs. Fullaway and Rock, so that to a large extent T 

 am only the recorder of these new species. 



The types are all deposited in the collection of the Hawaii- 

 an Sugar Planters' Association, Honolulu. jMeasureraents 

 are from the apex of vertex to the anus and from the base to 

 apex of one tegmen. 



The generic name Ilhurnia has been used in place of the 

 better kuown Xef^n.-^j/dne, but the change is unavoidable. 



Ki'.r.isiA Fieb. 



Kelisia eragrosticola, n. sp. PI. IV, f. 2. 



^^alc■. Rrachypterous ; length 2.6 mm.; tegmen I mm. Vertex slightly 

 Innser than the width at base, apex slightly conically produced, narrower 

 than base, sides straight, converging towards apex, the Y carina obscure. 

 the diamond-shape cell not reacliing the apex; length of face about twice 

 the width, widest a!)out tlie middle, median carina simple; an.tennae 

 reaching aI)out the middle oi clyi)eus, first joint half the length of the 

 second. Pronotum abmit as long as vertex, lateral carinac straic^ht and 

 .slightly diverging to near hind margin, then slightly converging and 

 reacliing the liind margin. Tegmina not reaching to the middle of abdo- 

 men, lliiul tibiae longer tiian tarsi, first tarsus subequal to the other 



