Gomphine Dragonflies from South America. 139 



forward a strongly marked dentiform projection into the dark 

 anterior half; and the fifth crossing the metepimeron medially. 

 The extreme posterior angle of the metepimeron greenish 

 yellow. 



Wings (PI. VII. fig. 15) hyaline. Costa anteriorly golden 

 yellow as far as the pterostigma. Subcosta red. Radius and 

 some, at least, of the succeeding convex veins, seen from above, 

 black. Viewed obliquely from behind, the entire venation, in- 

 cluding the costa, appears to be red. Antenodals 19-20 in the 

 fore wings and 12-13 in the hind wings. A basal subcostal 

 cross- vein present in each wing. In the fore wings the 

 second hypertrophied antenodal is the seventh in the series ; 

 in the hind wings it is the sixth. Postnodals 10 in the fore 

 wings and 10-11 in the hind wings. Arculus at about the 

 level of the second regular antenodal. One cubito-anal cross- 

 vein, supplementary to the anal crossing and the one closing 

 the subtriangle, in right fore wing and in each hind wing; 

 not present in left fore wing. Anal triangle in hind wing 

 containing from four to five cells, and the anal loop five cells. 

 Pterostigma with a weak brace-vein, very broad, 4*5 mm. 

 long, surmounting from four and a half to nearly six of the 

 cells below, opaque, very dark red, bounded by black veins. 

 The cells between M 2 and lis beginning to be doubled beyond 

 the level of the proximal end of the pterostigma. The trebling 

 of the post-trigonal cells beginning a little after the level of 

 separation of M 1+2 - Cuj and Cu 2 in hind wing not strongly 

 divergent ; three to four cells between them at the wing- 

 margin. 



[Fore legs missing.] Mid legs black. Femur of hind leg 

 blackish beluw ; above greenish yellow, with two dark longi- 

 tudinal lines. [Tibia and tarsus missing.] 



Abdomen: ground colour of segments 1 and 2 chocolate- 

 brown, of segments 3-10 black. Fach segment marked with 

 yellow or greenish yellow, as follows : — 1 with a band on the 

 basal margin and a broader ring on the apical margin ; 2 

 with a broad median stripe, expanding apically into a narrow 

 ring ; 3-6 with a basal ring, occupying more than a third, 

 but less than a half, of the segment ; 3 with a large and 6 

 with a small lateral spot on each side of the segment, beyond 

 the ring; 7 with the basal half yellow, the ring strongly 

 produced into the apical half laterally ; 8 and 9 with a broad 

 basal ring, strongly produced towards the apex of the segment 

 medially and laterally; 8 with a few black denticles on the 

 dorsal carina; 10 chiefly yellow. Auricles yellow. 



Posterior hamules very prominent, long, black, densely 

 clothed with pale hairs in the distal halt; in profile view 



