. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. RUIBAL AND WILLIAMS : ANOLIS HOMOLECHIS COMPLEX 213 The most useful diagnostic characters are listed and defined below:1 1. The number of scales that separate the supraorbital semi- circles. There may be from 0-3 scales between the semicircles. 2. The type of suture between the mentals and the small post- liiental scales. This may be a transverse suture (Figure 6b) or the small postmentals may separate the posterior medial margins of the mentals (Figure 6a). 3. The structure of the supracarpal and supradigital scales.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. RUIBAL AND WILLIAMS : ANOLIS HOMOLECHIS COMPLEX 213 The most useful diagnostic characters are listed and defined below:1 1. The number of scales that separate the supraorbital semi- circles. There may be from 0-3 scales between the semicircles. 2. The type of suture between the mentals and the small post- liiental scales. This may be a transverse suture (Figure 6b) or the small postmentals may separate the posterior medial margins of the mentals (Figure 6a). 3. The structure of the supracarpal and supradigital scales. These scales may be smooth, have a single keel, or be multi- carinate and mucronate (Figure 7). 4. The number of scales between the first canthals. This may vary from 4-12 scales. The first canthal is defined as the an- teriormost enlarged and elongate canthal scale. 5. The structure of the scale anterior to the external naris. This scale may be single or divided by a median horizontal suture (Figure 8). 6. The size of the scales along the posterior border of the interparietal. These scales may be large and sharply distinguish- able from the dorsals (Figure 3) or they may be small and grade into the dorsals (Figure 4). 7. The head/ear ratio as an indication of the size of the ear. The head length is measured with Vernier calipers and is the distance from the tip of the snout to the anterior border of the ear. EAR HEIGHT HEAD LENGTH Figure 1. The head length and ear height measurements. These dis- tances are best measured with the use of calipers. i The scale terminology used is that defined by Smith (1946).. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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