NEHALENNIA 307 
3 Dorsum of abdominal segment 8 dark metallic green with no pale 
dorsal spots; 9-10 blue, 9 with a metallic green stripe on each 
side of the dorsum reaching from the base to one-half to two- 
thirds the way to the proximal end, 10 with a transverse basal 
blsele: lined i953 hp Aes: eliveehos Mf 5: integricollis, p. 308 
Dorsum of abdominal segment 8 dark metallic green with a pale 
middorsal spot on the posterior fourth or less, and sides in- 
feriorly pale blue; 9 pale blue with a triangular dark metallic 
green spot on each side of the dorsum in its basal half or more; 
10 pale blue with a metallic green spot on each side of the dor- 
sum at the base. Superior appendages smaller than the in- 
FETIORS 5h te eee ie tne hace AE bee cine etd wld: irene, p. 308 
2. Females 
1 Hind margin of the prothorax entire and convex. Abdominal seg- 
ment 8-9 dark metallic blue-green, no pale dorsal spots on 8, a 
pale blue dorsal spot on 9, sides inferiorly and 10 pale blue with 
slight traces of black at extreme base... .integricollis, p. 308 
Hind margin of the prothorax emarginate................... 2. 
2 Hind margin of the prothorax bilobed. Segment 8 pale with a 
transverse stripe and lateral band of dark, or the dorsum of 8 
almost entirely black; 9 blue with a triangular dark lateral band; 
AICS ROSEN AES EO TPR Sa as ae ee Oe ev ay er gracilis, p. 307 
Hind margin of prothorax trilobed. 8-9 dark metallic green, 9 
with a pale dorsal spot. Rarely 8-9 colored like male...... 
PIE BS SAL NRE Ch Salt At wretetn a Rra sa WRC ih Sean ae aI 6 irene, p. 307 
RMHO WH... Sot |: St: ba hee eena Bacau ie Aah ee pallidula, p. 308 
297. Nehalennia pallidula Calvert 
Calv. 713, p. 373. 
Length 24 mm. Expanse 26 mm. Fla. 
Another delicate bronzy green species. Face pale, cross striped with black 
on the postclypeus, and a narrow line on the base of the labrum. Front of thorax 
bronze green. Sides yellow below the middle line. Sides of abdominal segments 
1-6 pale bluish; of 7-8 yellowish; dorsum of 8 green with no dorsal spots; of 9-10 
blue; 9 with a green stripe each side, 10 with a transverse basal black line. 
Appendages blackish. 
298. Nehalennia gracilis Morse 
Morse 95, p. 274: Mtk. Cat. p. 64: Walk. ’13, p. 161: Garm ’27 p. 51. 
Length 25 mm. Expanse 32 mm. Mass., N. Y., N. J. 
Another slender bronzy green species. Face is paler with blackish postclypeus 
and with a dark triangle projecting forward from the base of the labrum. Basal 
