443 



The Australian genera may be separated as follows : They 

 all belong to the sub-group with closed clavus: 



1. Antennae reaching plainly beyond eyes 2. 



!a. Antennae not reaching as far 3. 



2. Frons transverse, aiigulate laterally 4. Dardits Stal. 



2a. Frons scarcely wider th'an long, roundly anipliate on each 



side I . Gcdrosia Stal. 



3 Pronotum and scutelluni together about as wide as long 



2. Platybmckys Stal. 



3a. Pronotum and scutelluni together, wider than long 4. 



4. Frons strongly carinate and excavate 



6. Gcljstopsis, gen. nov. 



4a. Frons flat or only slightly rugose; ligbtly carinate 5. 



5. Tegmina elongate, narrow. . . .5. EiironotolvacJiys. gen. nov. 

 5a. Tegmina shorter, broader 3. Oloiiia Stal. 



The Australian Eurybrac'hyini are probably all Eucalyptus- 

 feeders: Euronotohmchys arciiata was found always in grass, but it 

 had probal:)l}- l)een blown or fallen from Eticaly'ptus. 



Gcdrosia Stal. 



GcdrosiaStal 1862 ( ). A'. A. F. XIX 448. 

 I. Eurybrachys faria Walker 1851, List. Horn. 3(;4. 

 Unknown to me. 



Platybrachys Stal. 



Platybracliys .Stal 1859 Eugenie's Resa. Ins. 280, and 1861 R. 

 \^et. Ak. Hand!. 3 N'o.'6, p. 67 and 1862, O. V. A. F. XIX 448- 



A large number of Australian species have been described, 

 none of which however have I been 'able to identify. In the 

 lirst work cited, Stal figures the type, but the structure of the 

 head and of the clavus are not like any Australian forms I have 

 seen ; in the second work the genus is included among the forms 

 with open apex to clavus ; in the third (one year later) among 

 those with closed apex ! In the forms aboiut to be described the 

 clavus is closed, but is not acute. The genus is badl}' in need of 

 revision. 



I. octilafa, sp. jiov. 



Head testaceous, sometimes tinged with olive brown ; prono- 

 tum and scutelluni sordid castaneous, abdomen mostly black ; 

 anterior and intermediate legs castaneous, except the black, 



