INTRODUCTION 



The material upon which this paper is based was for the most part 

 obtained by the author in the course of an extended tour through the 

 arid, southwestern portion of the United States. This tour was under- 

 taken for the purpose of investigating the distribution and abundance of 

 a lac-producing scale insect, Tachardia larreae (Comstock), and the facts 

 concerning this particular species will be presented in another paper. 

 In addition to the species thus obtained a few others coming from other 

 sources but either occurring in this area or having some direct connec- 

 tion with species occurring there are included. For most of the material 

 of this class acknowledgments are due to Professor Cockerell. 



The author has elsewhere expressed the belief that more may now 

 be accomplished in the study of the Coccidae by the redescription of 

 many of the named forms than by the naming of new species. This 

 paper, therefore, is presented not only for the purpose of recording new 

 forms but even more with the hope of elucidating as many as possible of 

 species already named. From the author's viewpoint the new species, 

 considered merely as such, are but an interesting by-product of the 

 study. 



The types of all the new species herein described are deposited in 

 the collection of Coccidae of the Department of Entomology of Stanford 

 University. In all cases a holotype has been designated. 



In the arrangement of the genera the Fernald Catalogue of the Coc- 

 cidae has in general been followed, except in cases where that arrange- 

 ment is obviously artificial. In the case of species listed in this catalogue 

 and its various supplements no references are giveri unless a change in 

 name is here made. 



