Acanthagrion chacoense Calvert. 1909, 1917

DeMarmels, Jurg, 1992, Dragonflies (Odonata) From The Sierras Of Tapirapeco And Unturan, In The Extreme South Of Venezuela, Acta Biologica Venezuelica 14 (1), pp. 57-78 : 62

Acanthagrion chacoense Calvert. 1909

Figure 30

Material (2♂, 1♀), Base Camp. 1♂, 1♀ (in tandem) , upper Rio Mavaca (S of Base Camp) .

Remarks. The male from Base Camp was flying over a small stagnant pool in the large dearing of the camp, in the neighbourhood of the river. The tandem was caught over low bank vegetation on the Mavaca. This is the second record of the species from Venezuela.

The female was described by Calvert (1961), but the mesepisternal fossae are not mentioned. These appear as hardly noticeable shallow impressions at the median end of the furrow, which separates mesostigmal laminae from mesepisterna ( Fig. 30 ).

Figures

Plate IV: Figures 25-29. Acanthagrion apicale. female ultimate instar exuviae. (25) labium, dorsal view; (26) left antenna; (27) exuviae (left lateral gill lost). dorsal view; (28) tip of abdomen with gonapophyses, ventral view; (29) median gill (at left) and right lateral gill, right lateral view. Figure 30. Acanthngrion chacoense, female mesostigmal laminae and m sepisternal fossae, dorsal view.