. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 48 Bulletin Museum of Comparative Zoology, Vol. 141, No. 1 SCALE 0 100 200 I I 1 MILES. D. haetiana A. funereus ^ â exiguus ^^ A . polylepis 0 0 Fig. 37. Proposed routes of colonization of the West Indies by the funereus species assemblage. The arrows are not in- tended to represent exact paths. The distribution of extant species is as indicated. entiation into the morphologically some- what specialized and ecologically restricted species Darlingtonia haetiana. Today D. haetiana occurs only in the montane massifs of t
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 48 Bulletin Museum of Comparative Zoology, Vol. 141, No. 1 SCALE 0 100 200 I I 1 MILES. D. haetiana A. funereus ^ â exiguus ^^ A . polylepis 0 0 Fig. 37. Proposed routes of colonization of the West Indies by the funereus species assemblage. The arrows are not in- tended to represent exact paths. The distribution of extant species is as indicated. entiation into the morphologically some- what specialized and ecologically restricted species Darlingtonia haetiana. Today D. haetiana occurs only in the montane massifs of the southwestern and Barahona penin- sulas at altitudes ranging from 1000 to 5600 feet. One possible explanation for the peculiar distribution of this species is an ecological replacement of the former wide- spread species (possibly by pawifrons?) with D. haetiana remaining as a montane relict. This zoogeographic pattern is sum- marized in Figure 37. A PROBLEMATICAL GENUS Two species remain to be discussed: laltris ( and 7. parlshi from Hispan- iola. laltris dorsalis (I have not seen I. ) Ls a large species and is most similar to Alsophis in many skull char- acters, but distinct in many external and hemipenial characters. The skull is nar- rower, especially in the otic region. In its dentition this species is unique among West Indian xenodontines in having prominent grooves on the enlarged posterior maxillary teeth. The bilobed hemipenis is very long, ridged with numerous folds, and has an apical ornament of weakly developed flounces. Externally there are seven up- per labials as in Arrhijton generally, but the \'entral and subcaudal scale counts are similar to those of Alsophis. laltris dorsalis (and presumably I. parishi also) is not very close to any other Antillean species as far as can be determined from its present morphological specializations and therefore certainly should be retained in a distinct genus. In most characters laltris shows its greatest si
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