xxxii, '21 | 



NEWS 



139 



three dimensions, rather than merely in a Dingle plane. The 

 lines of descent of the Phasmida and (.Jrylloblattida have been 

 omitted in order to make the figure less complicated, although 

 it should be borne in mind that the ancestors of the Coleop- 



ANOPLEURA- 

 MALLOPHAGA 



, HEMIPTERA- 

 \ HOMOPTERA 



THYSANOPTERA- 

 PSOCIDA 



ZORAPTERA- 

 ISOPTERA 



MANTIDA- 



PROTOBLATTIDA 



HYMENOPTERA 



MECOPTERA- 

 NEUROPTERA 



.COLEOPTERA- 



DERMAPTERA 



EMBIIDA- 

 PLECOPTERA 



HADENTOMOIDA- 



HAPLOPTEROIDA 



PALAEODICTYOPTERA 



tera, etc., were related to these forms as well as to those whose 

 fines of descent are represented in the diagram. The positions 

 of the insects in question in the superorders of pterygotan 

 insects have been indicated below. 



PALAEODICTYOPTEROID SUPERORDER 



(Panplectoptera, or Ephemeriformia) Protephemerida, EphenuTidu, 



Protodonata, Odonata, Palaeodictyoptera (in part), etc. 

 PI.ECOPTEROIII SUPERORDER 



(Panplecoptera, or Perliformia) Haplopteroida, Hadentonidiila, Ple- 

 coptera, Emhiida, Dcnnaptera, etc. The Coleoptera are closely 

 related to these insects, but may provisionally he grouped with 

 the Neuropteroids. 

 ( (KTHOITKKOHI SI'I-EKORDKR 



(Panorthoptcra, or Phasmiformia) Protorth"pi' ra, Grylloblattida, 



Phasmida, Ortlmptera (.\V;I.VH str!ct<>), etc. 

 ISOPTEROID SUPERORDER 



( I'anisoptera, or IHatti f< irmia i Protoblattida, Unptera, Ulattida. 

 Mantida, etc. 



