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Anadia pariaensis Rivas, La Marca, and Oliveros, 1999, and Anadia steyeri Nieden, 1914, are two particularly rare and poorly known lizards described from single specimens. In the case of A. pariaensis, it remains known from the holotype, whereas A. steyeri is known from three additional specimens reported in the literature after the original description of the species. A single new specimen of A. pariaensis and five of A. steyeri, including the first adult males recorded for both species, make possible a more representative description of both species, including descriptions of the hemipenes. Despite both species presenting some similar morphological characteristics, the examination of the hemipenial morphology revealed very different organs. The hemipenis of A. steyeri presents some characteristics that resemble the organs of two species from the Santa Marta Mountain Range in the “bitaeniata-group” (Anadia pulchella and Anadia altaserrania). On the other hand, the hemipenes of A. pariaensis are ...

Observations of a population of Anadia brevifrontalis were made during October and November of 1977 in the Venezuelan Andes. The study site was located in the paramo (alpine-tundra) of the state of Merida at 3,600 m. Basking and foraging activities occurred between 0930 and 1600 hrs., at an ambient air temperature range of 16.2-25.0 C. substrate temperature range of 19.9-29.2 C, and body temperature range of 15.2-27.4 C. Stomach contents contained 8 taxa of arthropods with larval Coleoptera/Lepidoptera, adult Coleoptera, and Araneae making up the most significant portion by weight. Most females contained yolking follicles or oviducal eggs during October and November as did others, more recently collected, in June and July 1979. The clutch size was two, with the eggs laterally fused and deposited in humus beneath rocks. Some nest sites contained only a pair of eggs, while others were communal. One of two communal nest sites contained eleven egg shells, the other at least 46 intact eggs and 27 shells.