. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 208 Bulletin Museum of Comparative Zoology, Vol. 157, No. 3 contrast, twice as many specimens each of S. prionotus and S. caducus are available from southern Peru and Bolivia. Yet, only one third of the available specimens of ei- ther species from these areas are males >60 mm SVL, and no males of S. caducus were >72 mm SVL. Figure 10 shows differences in the height of the vertebral crest in a series of males of Stenocercus prionotus from southern Peru and Bolivia compared with similar-sized specimens of S. prion
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 208 Bulletin Museum of Comparative Zoology, Vol. 157, No. 3 contrast, twice as many specimens each of S. prionotus and S. caducus are available from southern Peru and Bolivia. Yet, only one third of the available specimens of ei- ther species from these areas are males >60 mm SVL, and no males of S. caducus were >72 mm SVL. Figure 10 shows differences in the height of the vertebral crest in a series of males of Stenocercus prionotus from southern Peru and Bolivia compared with similar-sized specimens of S. prionotus from northern Peru and with S. caducus (the largest males of S. caducus studied were 72 mm SVL; see also Fig. 6). The trend toward lower crests in S. prionotus from the southern part of its range is evi- dent, as is the difference between S. cad- ucus and S. prionotus. A comparison of all specimens suggests that the difference in the height of the vertebral crest between S. prionotus and S. caducus males begins to be apparent by approximately 65 mm SVL and becomes pronounced at around 70-75 mm SVL. No males of S. caducus >72 mm SVL were among the specimens examined, despite the availability of a large number of specimens froin southern Bo- livia, including a series of 31 specimens (10 males >60 inm SVL) from the vicinity of Santa Cruz. A siniilar contrast in crest height appears in females of the two spe- cies (Fig. 12). Angulate Temporal Scales. Stenocercus prionotus has two (occasionally three) very strongly keeled, projecting angulate tein- poral scales on each side (Fig. 4). These are much larger than adjacent scales on the head and they are partially or com- pletely separated from the large posterior head scales (parietals, postparietals, and occipital) by one row of small keeled scales (occasionally partially doubled). Stenocer- cus caducus usually has two (occasionally three) angulate temporals that are smaller and less projecting than those in S. prion- otus.
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