Gynacantha helenga Williamson and Williamson.

Kormondy, E. J., 1959, Lestes tikalus, N. Sp. and other Odonata from Guatemala, The Ohio Journal of Science 59, pp. 305-312 : 311

Gynacantha helenga Williamson and Williamson. Poptun , April 16, THH-J-IJC (178), 1 ♂ (see Hetaerina pilula ) .

This species is not previously recorded from Guatemala or the Yucatan Peninsula; it has been known only from the type locality in Jalisco, Mexico. The excellent color preservation on this male, superior to that of the type male with which it has been compared, permits the following additions and corrections to the original description ( Williamson and Williamson, 1930). The clypeus and frons are bluish green rather than brownish green; on either side of the T-spot on the dorsum of the frons, the color is pale blue as in G. tibiata Karsch , rather than clear green; the dorsoposterior angle of the metepimeron is brownish blue; metacostal process is pale blue; apical half of dorsum of abdominal segment 1 is blue rather than “light brown?”; the anterior third of abdominal segment 2 is brownish green except for a basal blue annulus, and as stated by the Williamsons, the posterior two-thirds is blue with brown stripes. The tubercle in the median line near the apex of the sternum of abdominal segment 1 bears a well-marked depression on the ventral surface, similar to that in G. tibiata .