. Bollettino del museo di zoologia comparativa a Harvard College. Zoologia. West Indian Xenodontine Colubrid Snakes • maglio 31. Scala 0 100 200 MIGLIA D. perfuscus Fig. 24. Itinerari proposti di colonizzazione delle Indie Occidentali dalla specie melanotus assemblage. Distribuzione delle specie esistenti è come indicato. Antille dalla terraferma una specie simile a melanotus si è verificato in tempi relativamente recenti. Da questa specie o del suo antenato, ornatus (St. Lucia) era quasi certamente derivato, eventualmente tramite un ora estinto inter- mediare specie su San Vincenzo. Successive migrazioni oltremare (Fig. 24) probabilmente r

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. West Indian Xenodontine Colubrid Snakes • Maglio 31. SCALE 0 100 200 MILES D. perfuscus Fig. 24. Proposed routes of colonization of the West Indies by the melanotus species assemblage. Distribution of extant species is as indicated. Antilles by a mainland species similar to melanotus occurred in relatively recent times. From this species or its ancestor, ornatus (St. Lucia) was almost certainly derived, possibly via a now extinct inter- mediate species on St. Vincent. Successive overseas migration (Fig. 24) probably re- sulted in cursor on Martinique and jtilioe on Guadeloupe, Dominica, and Marie Galante. The Barbados species, perfuscus, appears to have been derived from one of the islands to the west, perhaps from St. Vincent or Grenada. Taxonomy. As mentioned above. Smith and Grant (1958) have sho'n that Bibron's (1843) type of Dromicus was cursor. With cursor and ahnadensis here considered as congeneric, Dromicus Bibron 1843 and Leimadophis Fitzinger 1843 become syno- nymic names for this assemblage. Although the actual dates of publication of these two names remain in question, December 31, 1843, is now to be taken as the official publication date of Fitzinger's Sijstema Reptilium (Smith and Grant, 1958), and Bibron's Dromicus thus becomes the senior synonym for the present assemblage with Dromicus cursor as the type species.^ The genus Dromicus is vei-v similar to the South American genus Liophis Wagler 1830. In all of the characters studied, Wagler's type of Liophis—L. cobella—is close to the present assemblage. The pre- frontal is like that of D. melanotus, the frontal is short with very little emargination above the orbits, and the interorbital par- tition is veiy small. The hemipenis of Liophis has a pair of well-developed apical disks as in D. melanotus, but differs in the presence of basal hooks (Roze, 1964). Body ^ After the present paper was in manuscript form, it was b

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• bookauthorharvarduniversity
• bookcentury1900
• booksubjectzoology