FORTY-TWO HITHERTO UNRECOGNIZED GENERA AND 

 SUBGENERA OF ZYGOPTERA. 



Clarence Hamilton Kennedy, 

 Ohio State University. 



During the past five years the writer has been engaged in a 

 revision of the genera of the Zygoptera. The following new 

 genera and subgenera have been in manuscript form for from 

 two to five years. In nearly every case the characters of the 

 penis have been the primary indicators that a new generic 

 term might be advisable. In nearly every case other char- 

 acters, usually venational, were found to parallel the penis 

 characters. 



The writer has attempted to give the genus a value which 

 as nearly as possible represents the same amount of differences 

 in whatever part of the Zygopterous series it might fall. This 

 ideal was not altogether attainable, because genera have been 

 split so very fine in the Agrionin^ and some of the other very 

 modern groups. Even in these groups, however, the genera 

 are not as close as in some sections of the Libellulidae, where 

 connecting links have not yet dropped out. 



No apologies are offered for the series of monotypic genera. 

 These in nearly all cases are annectant forms, the last fragments 

 of faunas preceding the present. 



Full descriptions of these new genera and subgenera with an 

 extended discussion of their relationships as shown by the 

 genitalia will eventually appear, the author hopes, as a bulletin 

 of the U. S. National Museum. 



Vestinus genus nov. 



Type — Vestalis {Calopteryx) gracilis Ramb. 



This new genus includes Vestalis amoena Selys. It differs 

 from Vestalis (type luctiiosa) in that the lobes of the penis are 

 approximated and parallel, M3 and M4 arise at the same point 

 on the arculus; there are never two complete rows of cells 

 between Cui and Cu2 and the wings are hyaline. 



Anaciagrion genus nov. 

 Type — Agrion {Calopteryx) cornelia Selys. 

 This new genus includes the single beautiful species cornelia. 

 It differs from Agrion in that Cusa is 5-6 cells long, as against 

 a length of 2-4 cells in Agrion and is directed entad and caudad 

 towards the anal field of the wing. 



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