. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 15. Hemlpenis morphology In the cantherigerus species assemblage; semidiagrammotic. Organ is dissected in situ. A, Alsophis ater, MCZ 6005; 6, Alsophis portoricensis, MCZ 58804. Approx. X 5- uneverted and Mainland relationships and origin of the group. Examination of South and Central American genera has revealed several that are morphologically very close to the cantherigerus species assemblage. Of the four mainland species customarily referred to the genus ^'Dromicus," three are clearly related to the pres
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 15. Hemlpenis morphology In the cantherigerus species assemblage; semidiagrammotic. Organ is dissected in situ. A, Alsophis ater, MCZ 6005; 6, Alsophis portoricensis, MCZ 58804. Approx. X 5- uneverted and Mainland relationships and origin of the group. Examination of South and Central American genera has revealed several that are morphologically very close to the cantherigerus species assemblage. Of the four mainland species customarily referred to the genus ^'Dromicus," three are clearly related to the present group; these are chamissonis, taclupnenoides, and angustili- neatus. The fourth species, '^Dromicus" amazonicus, is allied to the melanotus spe- cies group to be discussed below. The species taclupnenoides (Peru) and angustiUneatus (Peru) differ from chamis- sonis (Chile and Argentina) only in several minor characters, and what is said below about the latter will apply also to these two species. The major distinction between elunnissonis and cantherigerus (Cuba) is the lower number of teeth in the former (see appendix); in all other skull characters the two are extremely close. Externally there are no differences which would argue against a close relationship, although the mainland species have only one pit on each dorsal body scale. In the structure of the hemipenis the sulcus spermaticus is less deeply divided in chamissonis, but the. 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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