On the type specimens of some neotropical Megapodagrionidae, with a description of Heteragrion pemon spec. nov. and Oxystigma caerulans spec. nov. from venezuela (Zygoptera)

The type specimens of Dimeragrion secundum Needham. Heteragrion romani Sjdstedt. H. silvarum Sjostedt and H. speciosum Sjdstedt are discussed and figured. It is suggested, that H. romani Sjdstedt is a synonym of H. icterops Selys. and H. speciosum Sjdstedt a synonym of H. flavidorsum Calvert. — Heteragrion pemon sp. n. (holotype male: Venezuela, Bolivar, Guayaraca, Auyantepuy, 1020 m. 16-IV-I956; Facultad de Agronomia, Maracay) and Oxystigma caerulans sp. n. (holotype male: Venezuela, Bolivar, km 125, road El Dorado-Santa Elena de Dairen, 1280 m, 20-22- -V-I985; Facultad de Agronomia, Maracay) are described and illustrated. Figures and a description of the ultimate instar male exuviae, associated with the latter species by supposition, are also presented.