Calvert : Odonata of the Neotropical Region. 83 



never more than two rows of cells in any part of the anal area, with 

 two (56 per cent.) or three (44 per cent.) rows at most in the sec- 

 ond cubital area (16 wings examined), 3-6 cross-veins in the basal 

 median area, 4-6 cross-veins in the quadrilateral. 



9. Differs from the male in being dark metallic-green with the fol- 

 lowing parts pale yellowish : anterior surface of the second antennal 

 joint, labrum (except at base, which is black, and a median black line, 

 absent in some), external surfaces of mandibles, proximal parts of the 

 lateral labial lobes, a narrow longitudinal stripe (absent in some) on 

 each side of the middle prothoracic lobe and another on the inferior 

 margin of the prothorax each side, a short inferior mesepisternal stripe 

 bordering the lower end of the humeral suture anteriorly, a sub- 

 equally long, but narrower posthumeral stripe on the middle of the 

 mesepimeron, an elongated spot on the lower end of the same sclerite, 

 a small spot on the mesinfraepisternum, a stripe (reduced or interrupted 

 in some) on the first lateral suture, two spots (absent in some) on the 

 hind margin of the metepisternum, the lower larger and confluent 

 with the yellow which covers most of the metinfraepisternum, most 

 of the metepimeron (except for a median longitudinal black or 

 metallic-green stripe) wider at its upper end, where it does not reach the 

 base"of the hind wing, pectus, which, however, is encircled and trans- 

 versely crossed with black, in some the margins of the antealar sinus 

 and of wing-bases, a longitudinal lateral stripe on 1-2, 3 or 4, a nar- 

 row transverse basal mid-dorsally interrupted ring on 1-7, sides in- 

 feriorly of 9 and 10, the genital valves, spots on the coxae, and a stripe 

 on the proximal third of the second, half of the third, femora. 



Abdominal segment 10 with a mid-dorsal longitudinal carina on its 

 posterior half, carina prolonged into a short acute spine projecting 

 beyond the hind margin of the segment, which last is produced slightly 

 backward above and below each abdominal appendage, the produced 

 parts denticulated or spinulose ; appendages not quite as long as 10, 

 very acute at tips. Genital valves minutely denticulated. 



Wings pale yellowish-brown from base to nodus, this color fading 

 gradually toward the hind margin, at least distal to the level of the 

 quadrilateral ; remainder of the wings much clearer. Anal area of 

 front and hind wings and second cubital area of hind wings with never 

 more than two rows of cells, second cubital area of front wings with 

 three rows in its middle. Front wings with 4-6 cross-veins in the 

 basal median area and in the quadrilateral, 16-20 ante-, 27-33 post- 



