527 



venation is very puzzling, being of a very reduced type, not 

 like that of the Isoptera, but perhaps related to the very archaic 

 Psocopterous type still preserved in the genus Amphientomum. 



Order Perlaria or Plecoptera. 



A series of archaic genera from Australia and New Zea- 

 land, representing the two families EustJieniidae and Aus- 

 iroperlidae. 



After studying the Stoneflies of Australia and New Zealand 

 for many years, it has at last become possible to offer a new 

 classification of this Order, based on the recognition of the 

 existence of a very archaic Antarctic fauna, now confined to 

 Australia, Tasmania, New Zealand, and Chile. Of these, the 

 Eusthenlidae appear to be the primitive Perlid stock ; since, on 

 a calculation based on sixteen important characters used in 

 classification, they are 100 per cent archaic. The genera are: 

 Eusthenia, with many species in Tasmania and Victoria ; 

 Stenoperla, with one widely distributed species in New Zea- 

 land ; Diamphipnoa, with one species of great size in Southern 

 Chile ; and two new genera from Australia, not yet described. 

 All these were exhibited except Diamphipnoa. The Austroper- 

 lidae, specialized by reduction of the cerci and by some slight 

 alterations in the venation, contain only the two genera Aus- 

 troperla from New Zealand and Tasmanoperla from Tasmania. 



A third family of archaic Perlaria, not exhibited, are the 

 Lcptoperlidae, which is represented by many genera throughout 

 Australia, Tasmania, New Zealand, the Sub-antarctic Islands, 

 and South America as far as Brazil. 



The Perlaria of the Northern Hemisphere possess no repre- 

 sentatives of these three families, but consist exclusively of more 

 highly evolved families representing two separate lines, of 

 which Pteronarcidac and Pcrlidac form one, arising from 

 Eustheniid-like ancestors, and the Ncnutridae and Capniidac 

 the other probably arising from an old Leptoperlid stock. 



Order Coleoptera. 



A tube containing the larva, pupa and imago of the archaic 

 beetle Cnpcs concolor Westw. from Virginia. Fossils closely 



