PREFACE. 
Number of 
Species and Sub- 
species North of 
exican Line 
Number of 
Species and Sub- 
species South of 
Mexican Line 
xi 
Number of 
Species and Sub- 
species Common 
to Both Regions 
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Much care has been given that all the forms that have received 
names before this work was sent to the press should be included, 
and it is hoped that few, if any, have been omitted. 
