NORTH AMKRICAN ODONATA. . 233 



Near Phila., June 24, 30, by S. F. Aaron (A. E. S.) ; abundant ; 

 in copula June 30. Little Crum Creek, Ridley Twp., Del. Co., Pa., 

 July 6, by P. P. Calvert (C). 



Quebec to Florida; Texas, Illinois, Wisconsin (Provancher, Miss 

 Wadsworth, Harvey, Hitchings, Mrs. Slosson, Johnson — A. E. S., C.) 



B. Only one cell lying immedintely beneath the jjterostigma. 

 a. Pale colors predominating on thoracic dorsum. 



9. Argia violacea Hagen. 



Agrion v. Hagen, Syii. Neur. N. A., p. 90, 18fil. Argia v. Selys, Bull. Ac. Pelg. 

 (2) ss, p. 404, 1865. 



Eear of the head yellowish. Pterostignia brown. Tliorax with a mid-dorsal 

 and a humeral stripe, and a line on second lateral suture, hlaek. Vertex hlack. 



% . Violet, including post-ocular spots; two apical spots on 2-6, and the most 

 of 7. hlack ; 8-10 blue. Hind margin of 10 excised as in pntrida. Sup. app. one- 

 third as long as 10, hlunt. Inf. app. twice as long and as thick, directed up- 

 wards; extreme apex slightly notched in profile. 



9. Brown, or brownish green ; a black stiipe each side of 2-9, widest on 7. 



Abd. % 23-29. 9 24-27. H. w. % 18-21, ? 20-22. 



Common around Phila., June 6 — Sept. 10 ; in copula or oviposit- 

 ing July 6, 9, 11, 21, Sept. 10. 



Maine to Virginia ; Illinois, Texas (Bullock et al.). 



10. Argia tibiali»« Rambnr. 



Platycnemis t. Ramb. Nevr., p. 241, 1842. A. t. Selys, Bull. Ac. Belg. (2) xx, p. 

 41.3, 1865. Agrion fontium Hagen, Syn. Neur. N. A., p, 91, 1861. 



Rear of head hlack. Pterostignia blackish. Thorax with a mid-dorsal and a 

 broad humeral stripe, and a line on second lateral suture black. Vertex black. 



% . Lilac or blue. Postocular spots atid sides of thorax blue or yellow. Ab- 

 domen black, 3-7 with a transverse basal yellow ring: 9-10 blue. Hind margin 

 of 10 excised. Sup. app. one-third as long as 10, apex excised from side to side, 

 inner branch thickest. Inf app. longer, thicker, directed upwards; apex bifid, 

 upper branch longer and thicker. 



9. Blue or reddish; similar to %, 3-7 with a transverse basal ring and an 

 incomplete raid-dorsal line, yellow; 9 black, ]0 yellow. 



Abd. % 26-29, 9 26-29. H. w. % 19..5-22, 9 21-23. 



One I Beatty's Mills, Crum Creek, Del. Co., Pa., June 28, 1888, 

 by P. P. Calvert (C). Six % , New Jersey, July 4 (A. E. S.) 

 Pennsylvania to Florida ; Texas, Illinois. 



11. Argia apicalis Say. 



Agrion a. Journ. Ac. Phila. viii, p. 40, 1839. Argia a. Selys, Bull. Ac. Belg. 

 (2) XX, p. 414, 1865. 



Rear of ht^nd yellowish. Pterostigma brown. Thorax with mid-dorsal carina 

 and an inferior humeral spot, black. Vertex black. 



% . Pale blue ; 2-6 with a black stripe each side, 7 black, with a pale transv*se 

 basal ring, 8-10 blue. Hind margin of 10 excised, edges of excision much swol- 



TKANS. AM. ENT. SOC. XX. (30) SEPTEMBER, 1893. 



