. Bonner zoologische Monographien. Zoology. 127. Map 25. Distribution of A. dumerili. Specimens examined from these last two areas have large, flat, and keeled dorsals while the rows of ventrals vary between 12 and 14 and are straighter than in exiguus. The color pattern is also intermediate with some having reticu- lation and others having more or less conspicuous bands. In a series from Akjoujt, the color pattern and the large keeled dorsals are definitely dumerili whereas the longitudinal rows of ventrals, although they vary from 12 to 14, are as yet not straight. In the specimens from Noua
. Bonner zoologische Monographien. Zoology. 127. Map 25. Distribution of A. dumerili. Specimens examined from these last two areas have large, flat, and keeled dorsals while the rows of ventrals vary between 12 and 14 and are straighter than in exiguus. The color pattern is also intermediate with some having reticu- lation and others having more or less conspicuous bands. In a series from Akjoujt, the color pattern and the large keeled dorsals are definitely dumerili whereas the longitudinal rows of ventrals, although they vary from 12 to 14, are as yet not straight. In the specimens from Nouakchott, however, we already find the ventrals arranged in 12 straight longitudinal rows. In the specimens from Atar and in those from Fort Gouraud these characters vary considerably. Description A. dumerili is characterized by a small body, a short blunt snout, and rela- tively long hindlegs. The lanceolate concavity running between the frontonasal and the middle of the frontal is only barely distinguishable. The nasals are slightly raised. There are three supraoculars. What used to be the fourth one is now generally fragmented. Either one or two rows of granules between the supraoculars and the superciliaries may be present. The eyelids are moderately pectinate. Five supralabials lie anterior to the subocular. The subocular, wedged between the fifth and sixth supralabial, has a distinct keel bordering the orbit and is separated from the upper lip. There is one large supratemporal followed by a small one. Both have a longitudinal keel. The temporals are keeled. The anterior border of the ear opening is lightly 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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