Calvert : Odonata of the Neotropical Region. 165 



9. Differs from the male as follows: upper surface of head olive, 

 nasus bluish, with a short black line on each side, antennae olive or blue, 

 black of prothorax and mid-dorsal mesothoracic stripe replaced by 

 pale brown, hind prothoracic lobe pale brown with a median longi- 

 tudinal black line, line on the upper end of the obsolete first lateral 

 thoracic suture and round dot on the same suture pale brown, abdom- 

 inal segment 8 black, its hindmost dorsal third blue, 9 blue, with a 

 broad lateral black spot on each side, occupying the anterior half of the 

 segment, 10 blue, a black stripe on each side and a black line along its 

 posterior dorsal margin, the margin narrowly cleft medially to about 

 half the length of the segment. Appendages a little shorter than 10, 

 conical, black ; anal tubercle and genital valves blue, " palps " of the 

 latter black. 



Legs chiefly pale (blue?), a black stripe widening distally on the 

 antero-superior face of each femur, and a narrower black line on the 

 same face of each tibia, tarsal articulations black. 



Front wings with 13-14 postnodals, hind with n-12. 



Dimensions: Abdomen c? 25-29, 9 24.5-?; hind wing, $ 

 17. 5-19, 9 18.5-20; width of head, cT 3.4, 9 3.4; width of one 

 postocular spot, c? -64, 9 .68; maximum height of segment 10, c? 

 1.1 ; height of segment 9 at base, c? .84 ; width of tip of dorsal proc- 

 ess of 10, cT .34; maximum width of 10, cT -8 mm. The last six of 

 the dimensions are based on only one individual of each sex. 



Habitat : — Bolivia, near Coroico, Yungas, May 2 and io, June 

 7, 1899, 5 d\ and Chulumani, November 29 and December 17, 1898, 

 2 9, all by W. J. Gerhard. Academy of Natural Sciences of Phila- 

 delphia. 



The subspecific name proposed alludes to the absence in large part 

 of the usual black humeral stripe of A. graci/e, by which absence this 

 subspecies may be readily recognized. 



73. Acanthagrion gracile ascendens n. subsp. 

 (Plate V, figs. 81, Sia.) 

 tf. Agreeing closely with typical gracile and in its chief features 

 resembling specimens from Surubres mentioned under gracile 

 minarum. It differs from all the forms of gracile known to me in its 

 narrow dorsal process on abdominal segment 10 combined with the 

 great height of that segment, the process being only one-third as wide 

 as the segment, barely notched at tip, while in gracile type and varieties 



