Calvert: Odonata of the Neotropical Region. 177 



Prothorax blue, middle of hind lobe and in some also of middle lobe 

 blackish, hind margin flatly convex. 



Meso-metathorax blue, a mid-dorsal band, .32-. 52 mm. wide at 

 mid-height, very slightly narrower below (anteriorly), dark metallic- 

 green, margined with a black line on each side, or entirely black ; a 

 black line on the entire length of the humeral suture, a little widened at 

 its upper end ; a very fine short black line on the upper end, and a 

 black spot near mid-length of the obsolete first lateral suture ; a black 

 mark at the upper end of the second lateral suture ; the blue ante- 

 humeral stripe varies in width from wider to somewhat narrower than 

 the dark mid-dorsal. 



Abdominal segments 1-3 blue, the following markings black : a 

 square basal dorsal spot on 1, occasionally connected with the hind 

 margin of the segment by a fine black line, the articulations of 1 and 2 

 and of 2 and 3 very narrowly, a rounded spot on the posterior half of 

 2 connected with the hind end of the segment and in some with the 

 anterior margin by a mid-dorsal black line, and the hindmost fourth 

 of 3 ; in two specimens the black spot on 2 is reduced to an isolated 

 transverse stripe. Dorsum of 4-7 dark brown, becoming blackish 

 on the hind end of each segment, where it reaches down on the sides, 

 which latter, together with a transverse basal ring on each segment, 

 are blue. 8 and 9 and the sides of 10 blue. Dorsum of 10 black, its 

 hind margin with a median concave excision, extending from one-third 

 to one-half way toward the anterior margin of the segment, edges of 

 excision somewhat elevated to form a dorsal process, the tip of which 

 is truncated and somewhat bilobed in rear view, much as in some 

 species of Acanthagrion. 



Superior appendages in dorsal view about one-third as long as 10, 

 much wider than long, apex as wide as, or wider than, the base, 

 shallowly concave, inner apical angle, thus formed, slightly more acute 

 than the outer, each appendage in contact with its fellow of the oppo- 

 site side ; in profile view the lower outer portion of the appendage is 

 prolonged somewhat downward, and the more acute inner apical angle 

 shows as a minute more dorsally placed spine. 



Inferior appendages projecting caudad beyond the level of the su- 

 periors for a distance equal to about one-half of the length of the latter, 

 tapering from the base to the apex, which is curved upward ; the apex is 

 narrower in profile than in ventral view, as in the latter the two infe- 

 riors converge and the apex of each is transversely truncated. 



