so CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



For literature dealing with adults of this genus, see : Calvert, P. P. 

 Entomological News, 24: 310-316: 1913; also pages 373-4- 



Key to Species 



Adults 



Males and Females 



1. Caudal margin of female pronotum entire; superior anal appen- 



dages of the male longer than the inferiors integricoUis 



Caudal margin of female pronotum bi- or trilobed; superior anal 

 appendages of the male shorter than the inferiors 2 



2. Terga 9 and 10 of the abdomen, and most of 8 entirely blue in 



the male ; pronotum of female bilobed gracilis 



Terga 8 and 9 with considerable black on dorsum and sides ; pro- 

 notum of female trilobed irene 



In addition to the species mentioned, Miss Butler has described a species, 

 Nehallenia carlotta, from Saranac Inn, New York, which is said to differ 

 from gracilis in the shape of the anal appendages. (Can. Ent. 46; p. 346 

 figs, e, f ; 1914.) These, according to the figures, are slightly more pointed 

 than those of gracilis. 



Nehallenia integricoUis Calvert 



Entomological News 24: 312, 373-4: 1913. 



Nymph. — Unknown. 



Adult, male. — Predominating color dark green or bronze. 



Head : labrum about half blue ; postclypeus black, anteclypeus 

 blue ; blue on sides of head below the eyes and a pale transverse 

 stripe above clypeus, the pale color below the eyes extending onto 

 the postgenae in a broad vertical stripe ; second antennal segment 

 with a pale ring at middle. 



Thorax : greenish bronze above, blue or pale on sides and 

 below ; a straight line from base of the hind wings to the middle 

 of the katepisternum of the mesothorax marks lateral boundary 

 of the dark color ; wings with two antenodal cells, or one antenodal 

 cross-vein. 



Abdomen : bronzy green, pale blue or orange color along the 

 lateral margins and below ; segments 9 and 10 pale blue, 9 with 

 two dark triangles at base above (sometimes confluent), 10 some- 

 times with dark transverse stripe; inferiors a little longer than 

 the superiors with two teeth-like projections and one tooth on 

 the superior. 



Female. — Similar in color to the male. 



Thorax: hind margin of the pronotum (Fig. 11, No. 18) entire, 

 being neither bi- nor trilobed. 



Abdomen : segment 10 blue, 9 black with blue triangle on dorso- 

 meson, the sides pale. 



Measurements : total length, male 22.5. female 24-28 mm. ; 

 length of abdomen, male 18.4, female 24.5 mm. ; length of hind 

 wings, male 12.5, female 13. 5-16.5 mm. 



