1. Skink (Scincidae)
2. Lacerta agilis
3. Nile Monitor or Varanus (Varanus niloticus)
4. Zonurus cordylus (Cordylus cordylus)
5. Agama colonorum (Agama agama)
6. Gila Monster or Heloderma (Heloderma suspectum)

Drawings of six lizard species found in the Old World.
Date published 1920
Source The Encyclopedia Americana, v. 17, 1920, between pp. 546 and 547 (second plate)
Author unknown artist
Source: https://commons.wikimedia.org/wiki/File:Americana_1920_Lizard_-_Old_World_lizards.jpg

Skinks are lizards belonging to the family Scincidae and the infraorder Scincomorpha. With more than 1,500 described species, the Scincidae are one of the most diverse families of lizards. The sandfish (Scincus scincus) is a species of skink that burrows into the sand and swims through it. It is native to north Africa and southwestern Asia, but is also kept as a pet elsewhere.

The sand lizard (Lacerta agilis) is a lacertid lizard (Lacertidae) distributed across most of Europe and eastwards to Mongolia.

The Nile monitor (Varanus niloticus) is a large member of the monitor lizard family (Varanidae) found throughout much of Africa.

The Cape girdled lizard (Cordylus cordylus), is a medium-sized lizard indigenous to the southern Cape of South Africa. The Cape girdled lizard has a golden-brown body with spiny, keeled, body scales - especially on its tail.

The common agama, red-headed rock agama, or rainbow agama (Agama agama) is a species of lizard from the Agamidae family found in most of sub-Saharan Africa.

The Gila monster (Heloderma suspectum) is a species of venomous lizard native to the southwestern United States and northwestern Mexican state of Sonora.