INTRODUCTION 



It is probable that the scale-insect fauna of no area of comparable 

 extent, unless it be that of the region surrounding the Mesilla Valley in 

 New Mexico, is better known than is that of the Santa Cruz Peninsula 

 in California. Nor is it probable that there are many areas of similar 

 extent in which this group of insects is represented by a larger or more 

 diversified list of species. Small as this peninsula is, more species are 

 now known to occur out of doors within it than have been recorded in any 

 of the various state lists that have been published (deducting synonyms), 

 and it should be borne in mind that in all these lists there are included 

 numerous species known only from their occurrence in greenhouses. 



This richness of the Coccid fauna of the Santa Cruz Peninsula is due 

 in part to the fact that many introduced species which are found only in 

 greenhouses throughout much of the United States are here able to 

 thrive out of doors. Nevertheless, of the ninety-two species recorded in 

 this paper sixty are presumably native. The extent of our knowledge of 

 these species is due to the efforts of a long series of students who for 

 twenty years or more have been adding to it. A total of forty-six species, 

 of which seven are now regarded as synonyms, have their type locality 

 within this area. 



The accompanying sketch map (Fig. 1) will give some idea of the 

 size of this peninsula as compared with the entire state of California. 

 For the purposes of this paper the Santa Cruz Peninsula is regarded 

 as bounded on the south by a line drawn from Santa Cruz to San Jose 

 and thence to the southern extremity of San Francisco Bay. 



The presentation of a local list is but a small part of the real purpose 

 of this paper. In the case of many of the included species the existing 

 descriptions are in need of amplification, and in the case of many more 

 the available figures (if, indeed, there be any) are inadequate. The op- 

 portunity has therefore been taken especially to present figures of nu- 

 merous species. There is also included a considerable amount of infor- 

 mation having to do with locality and host records and synonymy, to- 

 gether with discussions of certain matters of more general interest. 



There are recorded in this list only species occurring out of doors. 

 Were greenhouse species likewise to be considered, the list might be 

 extended almost indefinitely. 



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

 University collection of Coccidas. 



