﻿I50 



forms between the two. Moreover in forms in which these 

 keels curve under the eyes in long-winged forms, there seems 

 to be a tendency towards a straightening of the keels in the 

 short-winged forms. The venation is of comparatively small 

 value. The relative proportion of the first segment of the 

 hind tarsi to the other two together is used as a character of 

 high importance by many authors, but I cannot so regard it. 



The characters which appear to me to be of generic value in 

 this section, lie in the genitalia and the tibial spur, though 1 

 am not prepared, without the examination of a large series of 

 European and American forms, to formulate genera based on 

 them. , 



I have therefore thought it best to include all the Australo- 

 Fijian species belonging to these "genera", in 'Dclphax', there- 

 by obviating future synonymic difBculties, as Delphax is a syno- 

 nym and has no generic value. It should be noted also that 

 'Libiiriiia often used for Dclphacodcs< is a strict synonvm of 

 Embolophpora. 



The Australo-Fijian species of this complex are disposed arti- 

 ficially as follows: 



1 Head, pronotum and scutellum fuscous or black with a 

 more or less sharply contrasted pale longitudinal stripe. . (2) 



la Head, &c., without such a stripe (7) 



2 Ground colour of head, pronotum and scutellum fiavo- 

 fuscous (3) 



2a The same blackish-brown (6) 



3 Long-winged forms: tegmina with internal half of mem- 

 brane smoky ( 4 j 



3a Short-winged forms (5) 



4 Narrower and longer, keels more pronounced. .13 gcraiior 

 4a Broader and stouter, keels less pronounced. ... 12 Wolophon 



5 Tegmina dark apically, with separate round black spot at 

 apex 14 kaha 



5a Tegmina dark apically. without separate round black spot. 

 15 Iciiuoiiias 



6 Long-winged form: tegmina more or less hyaline: 



A. Head dorsally not longer than wide 16 ancmouias 



AA. Head dorsallv distinctly longer than wide. 22 eupompe 



6a Short-winged form : tegmina dark, with a narrow white 



border 17 pylaon 



7 Frons yellowish, pale fuscous, or subsanguineous. prac- 

 tically concolorous (8) 



