I'i;k ka ck. 



THERE are now one hundred and ten species of Cordulina on record, and 

 thirty-three species are found in North America. As shown in the Bib- 

 liography, the immature states of three European species are described, 

 two of them more than one hundred years ago. and of two North American 

 species, five in all. Twenty-three have been described and figured here, 

 of which nine only are raised ; i. e. four from Europe, one from Australia. 

 and four from North America. The other fourteen are determined by sup- 

 position. 



To the Legio Macromia belong eight species, to the Legio Cordulia 

 fifteen. Of these, eight species belong to the genus Epitheca, and seven 

 species to the genus Cordulia. The genera Hemicordulia, Gomphoma- 

 cromia, Tetragoneuria. and Synthemis are not yet known in the immature 

 state, and may probably modify some of the statements here given. Per- 

 haps some groups as yet considered to belong to the Libellulina may be 

 recognized to be Cordulina; but this can only be decided when the sub- 

 family Libellulina is thoroughly studied. 



It has been decided to add the descriptions of Pantala and Tramea to 

 those of the Cordulina, rather than to those of Libellulina, as perhaps fuller 

 material may result in placing them as an intermediate group. 



