Vm INTRODUCTION 



of the University of Michigan Photographic Services. Miss Ellen 

 Linna typed the manuscript and was a reliable assistant in the very 

 large task of assembling the distributional data and making the maps. 

 Those parts of the paper that validate new generic, specific, and 

 subspecific names are the work of the senior author alone. Author 

 citation for them will therefore be "Townes" rather than "Townes 

 and Townes." Though there has been specialization between the 

 joint authors, the paper is the result of 25 years of joint effort, each 

 contributing according to aptitude and available time. 



