74 NEUROPTERA OF NORTH AMERICA, 



The length of the second segment in Agrioii antennaia Say, 

 shows that it does not belong to the genus Agrion in its stricter 

 sense. I am not quite sure if it is a Protoneura. 



AGRION Fab. 



The apical sector straight ; the postcostal space simple ; the quad- 

 rangular space trapezoidal, with the exterior, inferior angle acute; 

 the pterostigma small, rhomboidal ; abdominal appendages of the 

 males short. 



(Nehalennia Selys.) 

 The abdomen long and very slender ; the colors brazen. 



1. A. irene ! 



Agrion irene Hagen! 



Bright brassy-green; head yellow in front; the third article of 

 the antenntE anuulated with pale ; the hind margin of the protho- 

 rax broad triangular J*, or biemarginated 9 ; dorsum of the tho- 

 rax bright brassy-green, the sides yellowish, above brassy-green ; 

 feet pale, exteriorly lineated with black ; the abdomen slender, 

 brassy-green, the sides and a basal yellow lunule upon the 3 — 6 

 segments; segment 8 with an apical spot, 9 with a triangular dor- 

 sal one, 10 almost altogether blue J*, or 9 blue at the sides, and 

 10 blue at the apex 9, the tenth segment has the margin excised, 

 dentated ; appendages extremely short, the superior ones two- 

 parted, obtuse, the interior branch longer ; the inferior append- 

 ages are longer, blue, triangularly tuberculated ; 9 apex of the 

 10th segment cleft; with the appendages obtuse, short, yellow; 

 the eighth segment with no ventral spine ; wings hyaline ; ptero- 

 stigma short, rhomboidal, luteous ; from nine to eleven postcubital 

 cross-nervules. 



Length 25 — 28 millim. Alar expanse 28 — 30 millim. 



Hah. Chicago and Florida (Osten Sacken); Wisconsin and Illi- 

 nois (Robt. Kennicott) ; New Jersey (Uhler) ; Maine (Packard). 

 A most beautiful species. 



2. A. macrogaster. 



Agrion macrogaster Selys, Poey lus. Cuba, 4G5. 



Brassy-brown ; dorsum of the prothorax testaceous, the hind 



