202 Annals of the Carnegie Museum. 



the anterior end of the mid-dorsal carina and the pale green ante- 

 humeral stripe.* 



Abdomen brownish-yellow, a little darker dorsally, especially on 

 segment 7 ; hindmost eighth of 3-6 darker brown, a fine black trans- 

 verse ring on the intersegmental articulations of 3-6. A pale green 

 lateral longitudinal stripe on 1 and 2 of the damaged male only. 

 Hind margin of 10 neither excised, nor elevated. 



Superior appendages half as long as 10, in dorsal view appearing as 

 reddish rounded tubercles ; in profile view the upper margin is straight, 

 ascending, apex wider than base and prolonged downward (ventrad) 

 in a long acute perpendicular process. 



Inferior appendages reddish-yellow, in profile view straight, slender, 

 acute, reaching half again as far beyond the level of the superiors, 

 extreme apex black ; in ventral view each appendage is curved some- 

 what toward its fellow of the opposite side. 



Legs yellow, spines black, 6 in the anterior (outer) row of the third 

 tibia, tooth of the tarsal nails very small. 



Wings clear, veins brown, stigma pale grayish-brown, surmounting 

 considerably less than one cell, distal edge more oblique than the 

 proximal and convex, costal edge longest. Quadrilateral of the front 

 wings with the anterior side subequal to the proximal and less than 

 half as long as the posterior side ; of the hind wings with the anterior 

 side half as long as the posterior. Anal vein (= inferior sector of the 

 triangle of de Selys) separating from the hind margin distal to the 

 cubito-anal cross-vein by a distance equal to or less than the length of 

 the cross-vein itself, this cross-vein placed nearly midway between the 

 levels of the two antenodals. Postnodals on the front wings 10, on 

 the hind 9. 



9. An individual from Rio de Janeiro may belong here, and differs 

 from the preceding description of the male as follows : Hind margin 

 of prothorax not trilobed ; but produced medially and bilobed ; meso- 

 stigmal laminae nearly horizontal, projecting forward, the antero- 

 external angle rounded ; no mesepisternal tubercles ; dorsum of ab- 

 dominal segments 3-7 dark brown (except for a mid-dorsally inter- 

 rupted pale basal ring); widened down on the sides in the hindmost 

 sixth of 3-6 ; 2 with a mid-dorsal brown line stopping at a transverse 

 brown line at four-fifths of the length of the segment ; abdominal ap- 



*This tubercle is placed not quite as far laterad as the mesepisternal tubercle of 

 females of certain species of Argia. (Cf. Biol. Centr.-Anier., Neurop., p. 68.) 



