NORTH AMERICAN ODONATA. 243 



a narrow autehumeral, a humeral and three lateral stripes; 1-8 with a dorsal 

 spot or line and sides of 1-4. Costa black. App. blackish. 



%. Sup. ajip- straight, cylindrical, apex becoming gradually acute, no teeth or 

 spines. Inf. app. less than half as long. 



9 (not seen by the writer). No spines on vertex. Hind margin of occiput al- 

 most straight. Vulvar lamina half as long as 9. almost completely divided into two 

 oval divergent lobes. 



Abd. % 9 28. H. w. 'S 9 26. 



Nova Scotia to New Hampshire, Berks and York Cos., Pa. 



24. tioniphus abbreviatus Hagen. 



G. a. Hagen, Bull. Ac. Belg. (2) xlvi, p. 464, 1878. 



Yellow, including most of labium. Vertex black. No black stripe on suture 

 between frons and nasus. Dark brown predominating over yellow on thoracic 

 dorsum and forming two confluent submedian dorsal stripes, an antehumeral and 

 a humeral, confluent, a line in front of the metastignia and on the second lateral 

 suture. Abdomen black, a mid-dorsal and a lateral basal yellow spot on 1-6 or 

 8, sides of 8 and 9 yellow. Costa black. Pterostigma yellow to reddish brown. 



% . Hind margin of occiput convex. Sup. app. with apex acute and an infe- 

 rior spine-like tooth at two-thirds their length. Inf. app. shorter. 



9- A spine on each side of vertex. Hind margin of occiput almost straight. 

 Vulvar lamina one-third as long as 9, triangular, apical half bifid, the halves 

 contiguous. 



Abd. % 26-33, 9 28-29. H. w. % 22-25, 9 25-25.5. 



One male, Phila. (A. E. S.), probably belongs to this species. 

 Maine, Massachusetts. 



b. Dorsum of 10 mostly yellowish or reddish. No spines on vertex of female. 

 35. Goniphus exilis Selys (PI. II, fig. 11). 



G. e. Selys, Bull. Ac. Brux. xxi, pt. 2, p. 55, 1854; (2) xxxv, p. 748, 1873. 



Pale green. Vertex brown. Hind margin of occiput nearly straight. Brown 

 predominating on thorax and forming two median dorsal stripes, widening down- 

 wards, an antehumeral and a humeral stripe barely separated by a pale line, and 

 most of the sides, leaving two oblique, lateral, green bands, one behind the hu- 

 meral, the other behind the second lateral suture. Abdomen blackish brown, 

 1-10 with a basal dorsal green spot or band. 



% . Sup. app. with an inferior tooth-like process at two-fifths their length, the 

 apical side of the process sloping gradually to apex of app. 



9. Vulvar lamina short, not longer than one-fifth of 9, bilobed, lobes not con- 

 tiguous, as long as or a little longer than wide, tips roundly pointed. 



Abd. % 29-.30.5, 9 28.5-30. H. w. % 23-24, 9 24-25.5. 



The most common Gomphine around Phila., May 26 — July 4. 

 Quebec, Maine, Massachusetts, New Jersey, Pennsylvania, Mary- 

 land, Florida (Miss Wadsworth, Skinner, Laurent). 



TRANS. AM. ENT. SOC. XX. SEPTEMBER. 1893. 



