NOKIH AMKUICAN ODONATA. 251 



the thorax hetweei) the front aud hind wings, au interrupted, transverse ring on 

 2, a triangular spot each side on 3-8, usually united and larger on 7. 



% (not seen by the writer). 10 not elevated. Sup. app. a little longer than 10, 

 a small median external tootli ; apical half curved outwards, apex moderately 

 acute. Inf. app. hardly shorter, apex truncated, upcurved. 



9 . Vulvar lamina very short, hardly emarginate. Apical two-thirds of wings 

 pale yellow. 



Abd. % 64, 9 63. H. w. % 55, ? 57. 



Philadelphia (Hagen 37, p. 57). 



Penn.sylvania, Maryland, Georgia, Florida (W. I.). 



39. jflacroniia illiiioeiisis Walsh. 



M. i. Walsh, Proc. Ac. Phila., 1862, p. 397. Selys, Bull. Ac. Belg. (2) xxxi, p. 

 546, 1871. ? Epophthalmia georgina Selys, I. c. (2) xlv, p. 197, 1878. 



Metallic blackish brown. Nasus yellowish, obscurely bordered with black. 

 Frons above metallic blue, with four small yellow spots m front of the vertex. 

 The following yellow: a broad band surrounding the thorax between the front 

 and hind wings, a lateral spot and a middle transverse line on 2, a dorsal spot 

 each side of 3-6, a broad, basal, dorsal spot on 7. Usually no antehiimeral stripe. 

 1 or 2 posttriangular rows. 



%. Sometimes a dorsal yellow spot on 9. 10 not elevated. Sup. app. similar 

 to those of tssniolata. 



9 . Vulvar lamina short, less than one-sixth as long as 9, deeply bilobed at the 

 middle. Wings with a dark brown basal spot between costa and subcosta to first 

 autecubital. 



Abd. % 45-50.5, 9 49-53. H. w. % 41-45, 9 45-49. 



One male, Fairmouiit Park, Phila., P. Laurent (C) ; one male, 

 Pennsylvania (A. E. S. ). 



Quebec to Massachusetts; Pennsylvania, Illinois, Tennessee (illi- 

 noensis) ; Georgia, Illinois (H. L. Walker) {georgina). 



N. B. — The absence or presence of cross-veins in the triangles, by which de 

 Selys has separated Macromia from Epophthalmia, is not a constant character. It 

 remains to be seen whether georgina -aqA illinoensis are otherwise distinct, and 

 whether both are variations of tsenioJata. 



24. Epicordulia Selys. 

 Selys, Bull. Ac. Belg. (2) xxxi, p. 259, 1871 ; xlv, p. 207, 1878. 



40. Epieordiilia priuceps Hageu. 



Epitheca p. Hagen, Syn. Neur. N. A., p. 134, 1861. Cordulia p. Selys, 1. c. (2) 

 xxxi, p. 275, 1871. 



Olive- or yellowish brown. Abdomen swollen at base, yellowish, a mid-dorsal 

 brown band on 3-10, interrupted by a transverse, yellow ring at each articula- 

 tion. Wings with a basal, a nodal (this sometimes absent), and an apical spot 

 of variable sizes, brown. 



%. Sup. app. nearly as long as 9 + 10, apical two-thirds dilated. Inf. app. 

 one-third shorter, subtriangular. 



TEANS. AM. ENT. SOC. XX. SEPTEMBKR, 1893. 



