860 MESOZOIC IKSECTS OF QUEENSLAND, vii., 



evident that they all belong to the division Auchenorrhyneha, 

 comprising, at the present time, only the families Cicadidae, 

 Cercopidae, Jassidae, Membracidae and the old family Fulgori- 

 dae, this last being now usually split up into seven or more 

 families (Fulgoroidea) . Further than this we may also say 

 that the Cicadidae are not represented in the collection under 

 review. Their type of venation is very distinct; and nothing 

 approaching it has been found at Ipswich, with the single excep- 

 tion of the puzzling genus Mesogereon, which has been allotted 

 a special part of this work to itself, seeing that it constitutes a 

 very special problem involving the discussion of other Orders 

 as well. There remain, then, only the other families of the 

 Auchenorrhyneha in question; and hence we have to determine, 

 as far as possible, what are the venational differences to be 

 considered in separating one family from another, and thus in 

 placing our fossils in their correct families. 



First of all, the old family Fulgoridae contained, with very 

 few exceptions, insects in which the elavus of the tegmen had 

 the two veins 1A and 2A united together for a greater or less 

 distance distally, to form a true Y-vein, of the same type that I 

 have ah-eady discussed in the Lepidoptera (11) . We may, then, 

 take it that any Fulgoroid fossils would have this character. It 

 is only present in a single genus of the fossils, viz. Ipsvicia. 

 As these tegmina are very distinct from anything known at the 

 present day, I have placed them together in a new family 

 Ipsviciidae, belonging to the superfamily Fulgoroidea. 



The Cercopidae, Jassidae and Membracidae all agree in having 

 tegmina in which 1A and 2 A remain apart from one another. 

 This character is clearly shown in all the remaining tegmina in 

 which the elavus is preserved. In separating the remaining 

 fossils, therefore, we have to consider the venation of the rest 

 of the tegmen more carefully. 



In Text-fig. 1, I have shown the venation of an Australian 

 genus Cercopidae, Philagra (a), of an Australian Membracid 

 genus Sertorius (b), and an archaic Australian Jassid genus, 

 Eurymela (c) . 



In all Cercopidae which I have seen, as in Philagra here figured, 

 veins Se and R are distinct and separate for a considerable dis- 

 tance basally, and then become united. We may take it, there- 

 fore, that this character should appear in any fossil tegmina that 

 are to be considered time Cercopidae. As it is not present in 



