NORTH AMKRICAN ODONATA. 249 



Face greenish or liiteous, frous above with a black J-spot, with or without a 

 black line on fronto-nasal suture. Thorax dark brown, an antehumeral stripe, 

 two lateral bands and sometimes an intermediate line, blue or green. Abdomen 

 dark brown, marked with blue or green spots and lines; 10 with a blue spot 

 each side of dorsum, sometimes confluent. 



% . Abdomen constricted at 3. Sup. app. as long as 9 + 10, oblong, narrower 

 at base, margins entire, a superior longitudinal carina bearing 4-9 denticles, apex 

 varying from rounded with extreme tip barely pointed to being prolonged into a 

 distinct acute process which is directed somewhat downwards. Inf. app. half as 

 long or longer, triangular. 



9. App. oblong, narrower at base, apex rounded. 



Abd. % 51-57.5, ? 50-53. H. w. % 43-50, ? 42-46.5. 



Labrador to Massachusetts, Maryland, New York, Illinois, Mich- 

 igan, Wisconsin, Dakota, Saskatchewan, Irkutsk and Wilui River 

 (Siberia), Finland (Sheraton, Brown, Dr. Mark, etc. — C, A. E. S.). 



B. Male luith anal triangle of 3 cells, no dorsal teeth on 10. 



35. Aescliua coustricta Say. 



Ae. c. Say, Jour. Ac. Phila., viii, p. 11, 1839. Scudder, Proc. Host. Soc. N. H., 

 X, p. 212, 1866. 



Face green or brown, frons above with a black j-spot, sometimes a black line 

 on fronto-nasal suture. Thorax dark brown, an antehumeral green stripe, wider 

 above, and two lateral, green, blue or yellow stripes. Abdomen dark brown, 

 marked with green or blue spots and lines; 10 spotted or unspotted. Membran- 

 ule blackish, basal half whitish. 



% . Abdomen much constricted at 3. Sup. app. as long as 9 -|- 10, widened in 

 their apical half, emarginate on the inner edge in front of the apex, the emargina- 

 tion quite hairy and thickened to form a tubercle at its hind end (the hairs are 

 sometimes rjatted together to give the appearance of an acute tooth pointed 

 forwards); apex with a long, acute, inferior, slightly anteapical spine. Inf. app. 

 half shorter, triangular. 



9 • App. oblong, narrower at base, apex rounded. Wings sometimes yellowish. 



Abd. % 51.5-57.5. 9 51-55. H. w. % 42-48, 9 42-48. 



Common around Phila., Aug. 28 — Oct. 16. 



Labrador to Maryland, west to Colorado ; Southern California to 

 British Columbia; Kamtschatka, Siberia (A. E. S., C). 



21. Anax Leach. 

 Leach, Edinb. Encyc. ix, p. 137, 1815; Amer. ed. (Phila.) viii, pt. 2, p. 726. 

 1816. Karsch. Eiit. Nach. xvii, p. 287, 1891. 



36. Anax Junius Drury. 



Libelluln j. Drury, 111. Exot. Ent. I, p. 112, i.l. 47, fig. 5, 1770. .4.j. Hagen, 

 Psyche v, p. .305, 1890. 



Head and thorax liright green. Frons above with a round black spot, sur- 

 rounded by yellow, the latter encircled by a dark blue ring. 1 and base of 2 green, 

 3-10 blue ( % ), purple or lilac ( 9 ), with a partly interrupted, mid-dorsal, brown 

 band. Wings often pale yellowish to a varying extent. 



TEANS. AM. ENT. SOC. XX. (32) SKPTEMBER. 1893. 



