. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 34 Bulletin Museum of Comparaiwe Zoology, Vol. 141, No. 1. Fig. 27. Hemipenis morphology in Aniillophis parvitrons nov. gen., MCZ 60064; semidiagrammatic. The organ is uneverted and dissected in situ. Approx. X 5. portoricensis and related species. The j)re- niaxillary bones in andreae and pawifrons lack the long lateral process as in Dromicus. The dental formnlae in these two species is comparable to that of both Alsopliis and Dromicus; that is, about 16 + 2 niaxillaiy, 12 palatine, 26 pterygoid, and 21 dentary teeth
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 34 Bulletin Museum of Comparaiwe Zoology, Vol. 141, No. 1. Fig. 27. Hemipenis morphology in Aniillophis parvitrons nov. gen., MCZ 60064; semidiagrammatic. The organ is uneverted and dissected in situ. Approx. X 5. portoricensis and related species. The j)re- niaxillary bones in andreae and pawifrons lack the long lateral process as in Dromicus. The dental formnlae in these two species is comparable to that of both Alsopliis and Dromicus; that is, about 16 + 2 niaxillaiy, 12 palatine, 26 pterygoid, and 21 dentary teeth in parvifrons, and 21 + 2 maxillary, 16 palatine, 35 pterygoid, and 26 dentaiy teeth in andreae. Nonosteological characters. In external characters andreae and pawifrons are similar to Dromicus. The number of ven- tral scales is generally lower for these species than in Alsopliis and about the same as in Dromicus. The subcaudal scale number in parvifrons is higher than that of andreae and of species of Dromicus, while it is within the normal range for species of Aho})]}is. In the present assemblage, each dorsal body scale bears a single sensory pit in contrast to the two pits in all West Indian species of Alsophis, and in this respect is like most species of Dromicus. It is in the structure of the hemipenis, however, that andreae and parvifrons de- part radically from Dromicus. Here the organ has a deeply dix'ided sulcus sperm- aticus, bordered by a thick fold of spinose tissue. Several rows of stout spines parallel the sulcus, each branch of which terminates on a diskless apex bearing long filiform calyces (Fig. 27). There are no basal hooks, neither are there spines between the branches of the sulcus spermaticus as in Dromicus. This structure is basically like that of Alsopliis and is quite unlike that of Dromicus in \\'hich strong apical disks are present. Taxonomy and Origin. As noted above, the two species of the andreae group ex- liibit osteological features characterist
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