NOV., '08] ENTOMOLOGICAL NEWS. 429 



defined Macromiinae ( = Synthemiinae*) but only the faunal 

 genera, two in number, are considered and the contents of the 

 sub-family are not indicated. The genera segregated by his 

 first character, the triangle of the hind zving placed consider- 

 ably beyond the arculus, are not identical with the genera segre- 

 gated by his second character, the anal loop well developed and 

 hardly longer than broad. The third character, with more 

 th-an 2 cubito-anal cross-veins, like the characters on which 

 the two groups of de Selys were founded, is not a character 

 upon which major groups can be based. In A Gencalogic 

 Study of Dragonfly Wing Venation, 1903, Needham indicates 

 Synthemis as belonging to the Macromiinae. 



Omitting for the present the three Corduline genera with 

 4-sided triangles in the front wings, on venational characters 

 five groups of Cordulinae of approximately co-ordinate rank, 

 I believe, may be defined. The contents of these groups are as 

 follows f: 



I. Heinicordulia, Procordnlia, Somatochlora, Paracordulia, Doro- 

 cordulia, Cordulia, Helocordulia, Tetragoneuria, Epicordulia and 

 Epitheca; represented in the Oriental, Australian, Ethiopian, Palae- 

 arctic, Nearctic and Neotropical regions. 



II. Neurocordnlia, Aeschnosoma and Libcllulosoma; represented in 

 the Nearctic, Neotropical and Ethiopian regions. 



III. Oxygastra, Syncordulia, Neocordulia and probably Gomphoma- 

 cromia; represented in the Australian, Palaearctic and Neotropical 

 regions. 



IV. Nesocordulia, Idoinacromia, Idionyx and probably Macromidia; 

 represented in the Ethiopian and Oriental regions. 



V. Epophthahnia, Macronria, Aziuna, Didyinops, Phyllomacromia 

 and Synthemis; represented in the Oriental, Australian, Ethiopian, 

 Palaearctic and Nearctic regions. 



Some of the characters upon which this grouping is based 

 are as follows : 



I. M 4 and Cuj in front wing convergent. Group I. 



M 4 and Cuj in front wing parallel. Group III excepting Gom- 



phomacromia. 



M 4 and Cu t in front wing slightly divergent. Groups II and IV 

 and Gomphomacromia. 



* See Proc. U. S. Nat. Mus., vol. xxvii, page 698, foot-note a. 

 | No attempt at an orderly arrangement of the genera within each 

 group has been made. 



