140 NEUROPTERA OF NORTH AMERICA. 



base narrow ; inferior appendage shorter, triangular; vulvar lamina 

 longly bifid; wings hyaline, posterior ones with a basal streak, and 

 triangular basal spot, which is sometimes larger, blackish-fuscous, 

 pterostigma luteous ; membranule large, whitish-gray; anal angle 

 of the males rounded ; seven antecubitals ; four postcubitals ; two 

 discoidal areolets. 



Length 35 41 millim. Alar expanse 58 rnillim. Pterostigma 

 2 milliin. 



ffab. Massachusetts (Say); Philadelphia; Ohio; Louisiana; 

 Florida (Osten Sacken). 



Does it belong to this genus? Perhaps it is an Epitlieca. 



TETRAGONEURIA SELYS. 



Reticulation of the wings dense ; anal angle of the posterior 

 wings of the male, rounded. 



1. T. semiaquea! 



Libellula semiaquea Burm. ! Handb. II, 849, 61. Cordulia complanata 

 Rainb. ! Neuropt. 145, 2, (in part.) 



Fuscous; mouth and front luteous; thorax luteous, villose ; the 

 sides with an obsolete, yellow stripe ; feet black, anterior femora 

 luteous; abdomen broad, depressed, short, brownish-black, each 

 side with a marginal, maculose, yellow stripe; appendages black, 

 superior ones long, cylindrical, obtuse, the base narrow ; inferior 

 one triangular, a little shorter; vulvar lamina longly bifid ; wings 

 hyaline, basal half of the posteriors fuscous, subfenestrated ; ptero- 

 stigma small, luteous; membranule large, whitish; anal angle of 

 the males rounded ; six autecubitals ; five postcubitals ; two dis- 

 coidal areolets. 



Length 3236 millim. Alar expanse 52 58 millim. Ptero- 

 stigma 2 millim. 



Jfab. Savannah, Georgia ; South Carolina. 



2. T. balteata ! 



Tetragoneuria balteata Hagen ! 



Luteo-fuscous; mouth and front pale yellow ; labrum with a 

 basal point, and the front with a band at the eyes, fuscous ; the 

 large vertex and the occiput, pale yellow; thorax luteous, villose, 

 the sides yellow, two obsolete stripes each side, and larger spots at 



