Calvert : Odonata of the Neotropical Region. 235 



widening to the base of 8 (2.5 mm.), thence narrowing to 10 (1.2 

 mm.), blackish, the following pale green or yellow: the sides of 1 ; 

 a basal dorsal spot on 2 ; a stripe or spot on each side of 3-7, begin- 

 ning at the anterior end of each segment, and reaching to one-third of 

 3, to a shorter distance on 5-6, and to one-half of 7 ; each of these 

 stripes or spots on 3-7 is about half as wide as the half of the dorsum, 

 on which it lies. 



Superior appendages black, subequal to 9 -f to, in dorsal view fusi- 

 form, with acute apices converging toward each other ; in profile view 

 directed somewhat ventrad as well as caudad in the proximal two- 

 thirds, upward in the distal third, with an inferior tooth at two-thirds 

 length, proximal side of this tooth sloping very gradually and bearing 

 about six denticles ; distal side of tooth forming an angle of about ioo° 

 with the appendage, the apex of which is an acute spine. 



Inferior appendage about five-sixths as long as the superior ; viewed 

 from below its distal half is much narrower (about half) than the 

 proximal half, apex slightly emarginate. 



Anterior lamina not developed (unless it be represented by a pair of 

 slender short finger-like processes near the middle line of the front part 

 of segment 2); its place supplied by the first abdominal segment, which 

 is produced ventrad much more than usual and at first sight appears 

 to be the true lamina. Hamule complicated, in profile view longer 

 antero-posteriorly than high, at its anterior end with two acute spine- 

 like processes, both directed somewhat forward (cephalad), one di- 

 rected ventrad, the other dorsad and apparently applied against one of 

 the finger-like representatives (?) of the anterior lamina ; at its hind 

 end the hamule has a slender curved process applied against its fellow 

 of the opposite side and directed caudad, laterad, and slightly dorsad ; 

 this last process is the most prominent part of the hamule in profile 

 view. In ventral view the right and left hamules enclose a somewhat 

 elongated opening closed before and behind ; the ventral surface of 

 each hamule is grooved for its entire length. Genital lobe produced 

 vertically, so as to be subequally as prominent as the posterior hamular 

 process, narrowing to its rounded apex chiefly on its posterior side. 



Legs blackish. 



Wings pale dirty yellow, slightly more intense along the anterior 

 margins, hardly darker at the bases. Venation and stigmata dark 

 brown or black, membranule brown. Front wings with 10-11 ante- 

 nodals, 8-9 postnodals, two posttriangular rows increasing to three a 



