. Bonner zoologische Monographien. Zoology. 19. Petrosaurus Sceloporus Urosaurus Uta Um a Callisaurus Cophosaurus Holbrookia Phrynosoma. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig

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