NORTH AMERICAN ODONATA. 245 



9. Vulvar lamina hardly one-third as long as 9, triangular, bifid iu its apical 

 third, the halves contiguous. 



Abd. % 37-39, 9 38. H. w. % 30-33, 9 33.5. 



Ditches at Tinicum Is., woods at Folsom, ponds at Primos, Del. 

 Co., Pa., June 7 — July 5, P. P. Calvert ; not abundant (C, A. E. S.). 

 Massachusetts, Michigan. 



B. Abdominal segments 7-9 greatly dilated (i. e. 3-4 times wider than 4). 

 39. Goinphuiit va!^tiii!« Walsh. 



G. V. Walsh, Proc, Ac. Phila. 1862, p. 391. 



Frons and nasus greenish yellow, basal superior half of the former and a 

 broad band at suture between them, hlach. Labrum margined with black. Tho- 

 rax yellow and dark brown, the latter predominating dorsally and forming two 

 confluent, median, dorsal bands widening below, a broader antehumeral, a nar- 

 rower humeral stripe, a line iu front of the metastigma and one on the second 

 lateral suture. Abdomen black, a mid-dorsal yellow spot or line on 1-7 or 8, 

 8 and 9 with a large lateral, yellow spot, 9 and 10 unspotted dorsally. Wings 

 slightly yellowish at base. 



% ■ Sup. app. with acute apex and an extremely small, externo-inferior, ante- 

 apical spine. 



9- Vertex sometimes with a spine each side. Vulvar lamina slightly more 

 than half as long as 9, rather narrow, apical sixth bifid, tips acute. 



Abd. I 37, 9 35-37. H. w. % 29-31. 9 31-32. 



One male flew in a shop at Sixth and Chestnut Sts., Phila., May 

 28, 1891 ; P. Nell (A. E. S.). 



Quebec (Provancher), New York, District of Columbia, Illinois. 



15. Droinogomphus Selys. 



Selys, Bull. Ac. Brux. xxi, pt. 2, p. 58, 1854. 

 30. Droniogouiphus spiiiosiis Selys. 



D. s. Selys, I. c. p. 59, 1854. Gomphus s. Selys, Mon. Gomph. p. 120, pi. 7, tig. 

 2, 1858. 



Face, lips, occiput yellowish or green, vertex black. At most a very narrow 

 black line between frons and nasus. Thoracic dorsum maroon-brown ; mid-dorsal 

 carina, anterior border (these two confluent), an isolated submedian stripe, an 

 isolated antehumeral line, and the sides, yellow or green. Abdomen blackish, a 

 dorsal maculate yellow band on 1-10. Wings sometimes faintly yellowish at 

 base. 



% . Hind margin of occiput convex, no tubercle. Sup. app. divergent, an ob- 

 tuse inferior median thickening, apex acute, upturned. 



9 . Vertex with an erect spine behind each lateral ocellus. Occiput with a 

 median pointed tubercle. Vulvar lamina one-third as long as 9, its apical half bifid, 

 branches slightiy divergent, tips acute. 



Abd. % 39-41.5, 9 41.5-45. H. w. I 32-34.5, 9 35-39. 



Fairmount Park and elsewhere in Phila., June 10, 26, S. F. Aaron, 

 P. Laurent, P. Nell ; not common (A. E. S., C). 



TKANS. AM. ENT. SOC. XX. .SEPTEMBER, 1893. 



