234 PHILIP p. CALVEKT. 



len. Sup. app. one-third as long as 10, with a small inferior tooth. Inf. app. much 

 thicker, twice longer, directed upwards; apex bifid, branches of equal length, 

 upper branch thicker. 



9. Ochre-brown replacing blue of % ; 8-9 or 10 with a black stripe each 

 side; inferior humeral spot often small or wanting. 



Abd. I 26-30, ? 26-29.5. H. w. % 20-23, 9 20-23.5. 



Morton, ponds near Primos, Del. Co., Pa., June 24 — Sept. 10. 

 Fail-mount Park, Phila., by P. Laurent. District of Columbia, 

 Virginia, Illinois, Texas (A. E. S., C). 



b. Black predominating on thoracic dorsum. 



12. Arg^ia bipuiictulata Hagen. 



Agrion h. Hagen, Syn. Neur. N. A., p. 90, 1861. Argia b. Selys, Bull. Ac. Belg. 

 (2) XX, p. 415, 1865. 



Eear of head mostly pale. Pterostigma reddish brow'n. Thorax with a very 

 wide mid-dorsal and a wide humeral stripe, and a line on second lateral suture, 

 black. Vertex black. 



% . Blue ; a basal spot on 1, 2-6 at apex, 7, except at base, black. Hind margin 

 of 10 excised. Sup. app. one-third as long as 10, cylindrical. Inf. app. longer, 

 thicker, apex excised, lower branch thiclcer. A pale blue bifid tubercle between sup. 

 app. 



9 . Yellow replacing blue of ^ ; 6, and even 4 and 5, like 7. 9-10 black. 



Abd. % 20-22. 9 20-22. H. w. % 14.5-16, 9 15-17. 



Atco and Berlin, N. J., July 12, 17, by P. Nell and P. P. Calvert 

 (C). Three S 1 9 Pa. (A. E. S.) 



Georgia, Florida. 



5. ErythrominH. Charpentier. 



Charp. Lib. Eur. p. 20, 1840. Selys, Bull. Ac. Belg. (2) xli, p. 1300, 1876. 

 Erytliroiiiuia? couditiim Hagen. 



E.f c. Hagen, Bull. Ac. Belg. (2) xli, p. 1305, 1876. 



Blue or yellow, the following black : uasus, vertex, head behind and beneath, 

 a broad mid-dorsal thoracic band wider above and with irregular margins, and 

 a mark under each wing-base. 



%. Prothorax with hind margin entire, rounded. Ab. seg. I with a basal 

 spot, dorsum of 2-7 (except at base) and of 10, black. Sup. app. as long as 10, 

 apex dilated and curved inwards. Inf. app. a little shorter, straight. 



9- Prothorax with hind margin five-lobed, mid-dorsal lobe largest. Dorsum 

 of 1-10 black, of 10 cleft to base. 



Abd. I 28-29.5, 9 27-29.5. H. w. 1 20-22.5, 9 22-23. 



Maine (Miss Wadsworth), Maryland, District of Columbia. 



6. Nelialenuia Selys. 



Selys, Rev. Odon. d'Eur. p. 172, 1850; Bull. Ac. Belg. (2) xli, 1235, 1876. 



13. Nelialeuuia ireiie Hagen. 



Agrion i. Hagen, Neur. N. A., p. 74, 1861. N. i. Selys, I. c, p. 1240, 1876. 



Metallic green. Frons, lips, sides of thorax inferiorly, pale blue, green or yel- 

 low. No postocidar spots, but a yellow occipital line. 3-6 with an interrupted 

 transverse, basal, blue or yellow ring. 



