No. 39] ODONATA OF CONNECTICUT: COEN AGRIONIDAE 5 I 



Nehallenia gracilis Morse 



Psyche 7 : 274: 1895. 



Nymph. — The nymphs of this species are said by Walker 

 (Canadian Entomologist 45: 161-2: 1913) to lack the dark spots 

 on the gills, present in ircuc and to have fewer spines on the rear 

 of the head (4-6 compared with 12 or more in Irene). 



^leasurements : total length. 11 to 13 mm.; length of gills, 

 2,-2>-7 '"""1- ; length of hind wing-cases, 2.2-2.7 "^"i- 5 length of 

 hind femora, 2-2.3 ^^"''• 



Adult, male. — Color green and blue. 



Head : greenish bronze above ; pale blue postocular spots 

 apparently formed by continuations of the postocellar stripe ; face 

 below the compound eyes also blue ; second antennal segment with 

 pale ring at middle. 



Thoracic dorsum metallic green, the green color extending 

 beyond the mesopleural suture ; wings with three antenodal cells 

 or two antenodal cross-veins ; caudal margin of the pronotum 

 entire. 



Abdominal segment 8 blue, except a very narrow transverse 

 basal band, 9 and 10 all blue ; superior anal appendages nearly 

 as long as the inferiors, the latter each with a sharp tooth at the 

 caudo-dorsal angles when viewed in profile. 



Female. — Pronotum with the caudal margin bilobed, the 

 median incision with a small erect process (Fig. 11, No. 19) ; 

 abdomen with a large triangular spot on segment 9 and all of 

 segment 10 blue; spot on 9 sometimes produced to base and the 

 dorsum of 8 nearly or entirely blue, with a black band on each 

 side in the cephalic half of the segment. 



Measurements : length of abdomen, male 20-22, female 20-22 

 mm. ; length of hind wings, male 13-14.5, female 14-15 mm. 



Reported from Canada, Massachusetts, New Jersey and New 

 York. 



New England. — June 19- July 19. 



Nehallenia irene Hagen 



Synopsis of the Neuroptera of North America, 74: 1861. 



Nymph. — Color brown or green. 



Head : caudo-lateral margins with few spines ; second antennal 

 segment longer than the first, the second segment and the prox- 

 imal third of number 3, dark brown ; remainder of the antennae 

 lighter ; labium extending nearly to the mesocoxae ; each side of 

 the median lobe with a large mental seta and smaller one along- 

 side ; lateral setae six. 



Thorax : femora and tibiae with sparsely placed rows of setae, 

 the preapical brown femoral rings distinct : wing-cases extending 

 nearly to the apex of fourth abdominal segment, in some to the 

 middle of 5. 



