Dec, 1920] Hitherto Unrecognized Zygoptera 85- 



Goniostigma genus nov. 

 Type — Mecistogaster amalia Burm. 



Costal dilation of male hind wing angulate. Penis with a 

 large internal hood. 



Proplatycnemis genus nov. 



Type — Platycnemis hova Selys. 



Includes also agrioides Ris. Differs from Platycnemis in that 

 M2 arises at postnodal 6-7 in front wing and at 4 in hind wing 

 and that the stigma is longer than the cell below it. 



Leptargia subgenus nov. 



Type — Argia mollis Hagen. 



Inclndes fosteri, croceipennis, subapicalis, reclusa, tinctipennis , . 

 chapadcE, sociale, smithiana, botacudo, tamoyo, tupi, hasmani,. 

 sordida, thespis, tinctipennis. 



Internal soft fold of penis lacking, terminal segment flagel- 

 late. South American. 



Micrargia subgenus nov. 



Type — -Argia thisma Calvert. 



Includes also lilacina. Terminal segment of penis saggitate.- 

 Heliargia subgenus nov. 



Type — Argia vivida Hagen. 



Includes also plana, fiinebris, immunda, deami, probably 

 also talamanca, underwoodi and terira. 



Internal fold of penis small or wanting, terminal segment 

 irregularly triangular or even with a short attenuate tip. 

 External fold present. 



Cyanargia subgenus nov. 

 Type — Argia lacrymans Hagen. 



Includes also tonto. Penis with a flagellum attached to- 

 inner surface of terminal segment. 



Chalcargia subgenus nov. 



Type— Argia oenea Hagen. 



Includes also orichalcea, harknessi, barreti, calida, percellulata,. 

 insipida, ulmeca, adamsi, pipila, oculata, difficilis, rogersi, 

 jocosa, tezpi, translata, sedula, gerhardi, frequentida, cuprea, 

 pulla, nigrior, indicatrix, gaumeri, popoluca, cupraurea, johanella. 



Penis with apex bifid. 



Argyrocnemis genus nov. 

 Type — Agriocnemis argentea Tilly ard. 



Penis with edges of terminal segment serrate^ male superior- 

 appendages with hollow tips. 



