Calvert: Odonata of the Neotropical Region. 109 



Prothorax obscure yellowish with a mid-dorsal longitudinal black 

 stripe expanding on the hind lobe, but leaving the margins yellow. 



Remainder of thorax pale (blue?), but with blackish-brown pre- 

 dominating on the dorsum, so that there remains of the pale color only 

 a narrow line (bordering the .4-. 5 mm. wide mid-dorsal brown stripe 

 on each side, and in front of the antealar sinus) and the posterior 

 mesepisternal margin to a width of .3 mm. Mesepimeron and met- 

 episternum each with an ill-defined median brownish stripe from the 

 level of the metastigma upward. 



Abdominal segment 1 pale (yellow?), dorsum of 2-7 blackish- 

 brown, 2-5 with a fine mid-dorsal longitudinal yellow line, 3-7 with 

 a transverse basal yellow ring and the posterior sixth with a transverse 

 black ring ; the blackish-brown of the dorsum of 4-7 extends farther 

 down on the sides in the second and third sixths of the length of 

 those segments than in the fourth and fifth sixths, indeed completely 

 encircles these segments in the second sixth, so that in ventral view 

 each of segments 4-7 show two yellow and two brown transverse areas 

 alternating to make four in all ; 8 pale yellow with a mid-dorsal longi- 

 tudinal blackish band narrowing posteriorly to a line at the hind end ; 

 9 and 10 with the dorsum blackish-brown, sides -and under surface 

 yellow. 



Superior abdominal appendages twice as long as 10, not so long as 

 9, forcipate, base not swollen, inner margin with a slight and gradual 

 convexity at one-fourth length and a tooth at three-fifths length, apex 

 of tooth angular, not rounded, but not acute ; upper surface of the 

 appendage with a slight obliquely-transverse ridge above this tooth, 

 and with a longitudinal groove distal to this ridge almost to the blunt 

 and rounded apex of the appendage ; outer margin of the appendage 

 with 6-7 spines in the distal half; outer margins of the appendages 

 blackish, inner margins pale brown. 



Inferior appendages pale yellow, extremely short, their slender acute 

 apices directed upward. 



Legs obscure (bluish?) with two dark transverse bands on the 

 femora and the inferior surfaces of the tibiae blackish. 



Wings with the cubito-anal cross-vein ( = basal postcostal of de 

 Selys) proximal to the level of the arculus by a distance subequal to 

 the total length of the arculus, anal vein (here = inferior sector of 

 the triangle of de Selys) separating from the hind margin of the wing 

 between the levels of the cubito-anal cross-vein and arculus, two ante- 



