Only two teneral females and one fully mature female of this species are known. The latter is from Costa Rica and it was described by J. BELLE (1972, Odonatologica I: 63-71). Through the kindness of Dr. Oliver S. Flint, Jr. I had the opportunity to study another fully mature female of this species. This specimen is from Panama (Cabina, May 1911, August Busk leg.) and is now in the National Museum of Natural History, Washington, D.C If a comparison is made with the Costa Rican female the following characteristics of the Panaman female are worth mentioning: (I) Size smaller: Abdomen 33 mm, hind wing 27.5 mm; — (2) Pale spots on labrum much larger and not crescent-shaped; — (3) Postclypeus largely pale and brown along anterior border only; — (4) Posterior margin of top of head distinctly concave; — (5) Wings clear with the following features: (a) two extra cubito-anal cross-veins in left fore wing, one extra cubitoanal cross-vein in other wings, — (b) second primary antenodal cross-vein the seventh in each wing, — (c) pterostigma in fore wings slightly longer than one-third the distance from nodus to pterostigma, – (d) fore wings with a single row of cells in anal field and with two rows of cells posterior to Cu2, — (e) anal field in hind wings distally three (left) and four (right) cells wide, — (f) discoidal triangle in hind wings two-celled, — (g) supratriangle in right hind wing with a traversing cross-vein, in other wings free.