Dragonflies (Odonata) From The Sierras Of Tapirapeco And Unturan, In The Extreme South Of Venezuela Author DeMarmels, Jurg text Acta Biologica Venezuelica 1992 14 1 57 78 journal article 26316 10.5281/zenodo.3266063 39c9ce8d-d95d-467e-9590-ab184d952201 3266063 Argia insipida Hagen in Selys, 1865 Material. 1♂ , 1♀ (in tandem), Siapa 2 . Remarks. Numerous tandems were observed. all flying upstream. A few single males settled on a floating log. The populations south of the Orinoco differ from the northern form in having much broader black (brown in female) humeral stripes. These are about half as broad as the meseprimeron. The pale markings between the post· ocular spots are also much reduced or entirely wanting in the southern form.