. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 20 Bulletin MusciDu uf Cumpaiativc Zoology, Vol. 141, No. 1 ST. THOMAS portoricensis. SABA ETC rufiventris frontal broad premaxilla unreduced nasal modified ST. CROIX sancticrucis frontal broad premaxillcry unreduced ANGUILLA rijgersmoi frontal narrow premaxilla reduced nasal modified GUADELOUPE ETC. antillensis frontal broad premaxilla unreduced nasal modified Fig. 14. Geographic distribution of several morphological characters within the porfor/censis subgroup of the contfierig- erus species assemblage. Circle repre
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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 20 Bulletin MusciDu uf Cumpaiativc Zoology, Vol. 141, No. 1 ST. THOMAS portoricensis. SABA ETC rufiventris frontal broad premaxilla unreduced nasal modified ST. CROIX sancticrucis frontal broad premaxillcry unreduced ANGUILLA rijgersmoi frontal narrow premaxilla reduced nasal modified GUADELOUPE ETC. antillensis frontal broad premaxilla unreduced nasal modified Fig. 14. Geographic distribution of several morphological characters within the porfor/censis subgroup of the contfierig- erus species assemblage. Circle represents the supposed center of dispersion of this group. cateslnji, oxyrJiyncJtus, dorsaJis, and fre- natiis, are clearly united in a well-defined subgroup. All, except cates])yi, are long, slender, and clearly adapted for tree living. A recent study by Horn (1969) demon- strates the specific synonymy of "wetmorei" with frenatus and of ^'scondax" with cateshyi. The subspecies vudii titowonae as de- scribed by Barbour and Shreve (193S) has a higher ventral and subcaudal scale count than other races of vudii. Ileinipenis. The structure of the hemi- p)enis is remarkably uniform within the C(intherig, erus assemblage. The sulcus sper- maticus is divided near the base of the organ and each branch extends to the tip of one lobe of the deeply bifurcated apex (Fig. 15). Several rows of longitudinally arranged stout spines are present along the middle one half of its length; these grade into numerous smaller spines basally. The base may also hv nude or ha'e long plicae. The sulcus is bordered by a fringe of folded tissue bearing modest sized, closely spaced spines that grade into smaller ones distally. On the apex of each lobe, a reticulate net- work of tissue surrounds the sulcus, with moderate to long filiform papillae (papil- late calyces). These calyces usually grade into the surrounding tissue proximally, but may form a more or less well-defined capitate structure as i