Dragonflies (Odonata) From The Sierras Of Tapirapeco And Unturan, In The Extreme South Of Venezuela DeMarmels, Jurg Acta Biologica Venezuelica 1992 14 1 57 78 GGPD Hagen in Selys, 1865 Hagen in Selys 1865 [1283,1994,1979,2016] Insecta Coenagrionidae Argia Animalia Odonata 5 62 Arthropoda species insipida  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. 2906835301 [1517,2079,2030,2069] 1989-02-23 1989-02-25 1989-02-23 MIZA J. DeMarmels & A. Chacon Venezuela 500 1.7194445 Siapa 2 (upper Rio Siapa) -64.530556 5 62 2 1 1 Amazonas