252 PHILIP p. CALVERT. 



9. Vulvar lamina almost as long as 9, bilohed for its entire length. App. 

 nearly one-and-a-half times as long as 9 + ^0- 



Abd. % 42-45, 9 42-50. H. w. % 40-41, ? 40-46.5. 



Two males, June 14, July 1, Phila. ; one male, Bristol, Pa., June 

 16; S. F.Aaron (A. E. S.). 



Quebec to Connecticut ; Pennsylvania, Maryland, Georgia, Mich- 

 igan, Illinois, Texas (Provancher, Miss Wadsworth, Hitchings). 



25. Tetragoiieuria Hagen. 



Hagen, Syn. Neur. N. A., p. 140, 1861. Tetragoneura Selys, Bull. Ac. Belg. (2) 

 xiv, p. 207, 1878. 

 41. Tetragoneuria cyiiosura Say. 



Libellidn c. Say, Jour. Ac. Phila. viii, p. 30. 1839. Cordulia c. Selys, I. c. (2) 

 xxxi, p. 270, 1871. C. lateralis Burm., Hagen, Syn. Neur. N. A., p. 139, 1861. 



Blackish brown. Face and lips pale lilac or yellowish. Usually 110 superior 

 black T spot on frous. Thorax clothed with white hairs, a yellow spot above and 

 one below the metastigma. A yellow spot each side of dorsum of 2-9. Hind 

 wings with a short, superior, dark brown, basal streak to first antecubital, and 

 an inferior, triangular, basal spot not extending beyond the level of the median 

 cross-vein ; streak sometimes shorter and spot sometimes wanting 



'J, . Sup. app. as long as 9 -f" 10, thickened in their apical half, without teeth or 

 spines. Inf. app. one-third shorter. 



9. Vulvar lamina longer than 9, bifid almost to base, lobes divergent, some- 

 what bent towards each other in apical half. App. shorter than 9 + 10. 



Abd. I 28-30.5, 9 26-27. H. w. % 28-29, 9 29-30. 



One male, June 28, 1886; one male, June 4, 1887 ; one female, 

 May 30, 1887 ; one female, June 6, 1892; edge of thickets, Folsom, 

 Pa., P. P. Calvert (C). 



Quebec to Florida ; Ohio, Illinois, Michigan, Louisiana. 



Tetragoneuria semiaquea Burmeister. 



Libellula s. Burm., Handb. Eut. ii, p. 858, 1839. T. s. Hagen, Syn. Neur. N. A., 

 p. 140, 1861. 



Very similar to T. cynosura, but the hind wings have the basal streak extend- 

 ing farther out, basal spot reaching beyond the triangle, or even to beyond the 

 nodus. Probably only a variety of cynosura. 



Abd. % 24-28, 9 25-28.5. H. w. % 25-28, 9 27.5-30. 



Nova Scotia, Maine, Massachusetts ; District of Columbia to Fla. 

 (Miss Wadsworth, A. E. S.). 



26. IVeurocor<lulia Selys. 



Selys, Bull. Ac. Belg. (2) xxxi, p. 278, 1871 : xlv, p. 206, 1878. 

 IVeurocordiilia obsoleta Say. 



Libellula 0. Say, .Tour. Ac. Phila., viii, p. 28, 1839. Epitheca 0. Hagen, Psyche. 

 v, p. 369, pi. i, figs. 7-9, 1890, 



