Calvert: Odonata of the Neotropical Region. 161 



Males. 



I. Superior appendages as long as, or longer than, the inferiors. 



A. Superior appendages directed downward (ventrad) as well as caudad, not curved 



up at tip, and projecting only a slight distance beyond the level of the superiors. 



B. Pale postocular spots not confluent with the pale color of the rear of the head. 



C. Costal side of stigma of front and hind wings longer than the proximal 



or distal sides. 



D. Dorsum of abdominal segment 2 blue, with a black lance-head spot 



pointed anteriorly, but not reaching the anterior end of the segment. 



gracile lancea. 

 DD. Dorsum of abd. seg. 2 black for its entire length. 



E. Inferior appendages but slightly, if at all, upcurved at the tip. 

 F. Abdominal segment lonot more than one-and-one-fourth 

 ( i%) times as high in profile view as segment 9 at 

 base. 

 G. Superior appendages not widened at apex. 



H. Dorsum of abd. seg. 7 black, but its hind end 



blue. gracile. 



HH. Dorsum of abd. seg. 7 black, including its 



hind end. 



J. Black humeral stripe wider than, or as wide 



as, the pale blue aniehumeral. 



gracile niinarnm . 

 JJ. Black humeral stripe represented only by 

 small black marks at upper and lower ends 

 of humeral suture, the antehumeral blue 

 therefore widely confluent with the blue of 

 the side of the thorax. gracile ablutum , 



GG. Superior appendages widened at apex. 



latnpislylum 18 

 FF. Abd. seg. 10 one-and-one-third to one-and-one-half 

 (i^/j-ij^) times as high in profile view as segment 9 at 

 base ; apex of dorsal process of 10, as seen in end view, not 

 half as wide as the maximum width of 10 itself, very 

 slightly bifid; pale colors of upper surface of head and of 

 thorax pale blue, abd. seg. 7 blue at hind end. 



gracile ascendens. 

 FFF. Abd. seg. 10 twice as high in profile view as seg. 9 

 at base ; apex of dorsal process of 10, as seen in end view, 

 almost as wide as the maximum width of 10 itself, deeply 

 bifid, branches diverging, each branch subacute at tip; 

 pale colors of upper surface of head and of thorax orange- 

 red, abd. seg. 7 black throughout. apicale. 

 EE. Inferior appendages strongly upcurved at tips, abd. seg. 7 

 black, cuyalu? and subspecies (for their differences see postea). 



18 Calvert, Anales Mus. Nac. Buen. Ayres, vii, p. 26, figs. 1-3. 1899. Paraguay. 



