VI TABLE OF CONTENTS. 



The Radix group — Continuod. Page. 



Butleri ^ 87 



Description 87 



Habits and habitat relations .' 89 



Range 91 



Variation 94 



Affinities 96 



Conclusion 97 



The Sauritus group ( proximus, sackeni, sauritus) 98 



Proximus 98 



Description 98 



Habits and habitat relations 98 



Range 99 



Variation 102 



Affinities 106 



Sackeni 107 



Description 107 



Habits and habitat relations 107 



Range 108 



Variation 108 



Affinities Ill 



Sauritus 112 



Description 112 



Habits and habitat relations 112 



Range 113 



Variation 114 



Affinities 117 



Conclusion 119 



The Elegans group (angustirostris, melanogaster, scalaris, phenax, hammondi, 



elegans, ordinoides) 120 



Angustirostris 120 



Description 120 



Habits and habitat relations 121 



Range 121 



Variation 121 



Affinities 123 



Melanogaster 124 



Description 124 



Habits and hal)itat relations 124 



Range 125 



Variation 125 



Affinities 125 



Scalaris ' 127 



DescTiption 127 



Habits and habitat relations 128 



Range 128 



Variation 128 



. Affinities 130 



Phenax 130 



Description 130 



Range 131 



Variation 132 



Affinities 132 



