2 s. GOTO : 



8). Collections under the care of Prof. Nozawa and Prof. 

 Hatta of the Agricultural College of the Tohoku Imperial 

 University, Sapporo, Hokkaido. (S.) 



9). Collection of Mr. Alan Owston, Yokohama, donated to 

 the Science College. 



These collections will be referred to in the following pages 

 by the abbreviations placed in parentheses, as given above. 



At the outset it may be advisable to say a few words of 

 explanation as to the plan on wliich this work is written. My 

 primary object is to give succinct descriptions of all the species 

 represented in the collections just enumerated. I have however 

 endeavoured under each species to bring together previous descrip- 

 tions and references, so far as they are important for specific 

 determination — with translations in the case of languages less in 

 vogue in scientific circles — , so as to give what may be called 

 the taxonomic history of the species under consideration ; and 

 since it is believed to be nearly exhaustive it will be of some 

 help to those future students who may not enjoy the good fortune 

 of having an adequate library within easy reach. The tracing of 

 previous descriptions sometimes consumes much time and may be 

 disproportionately expensive, and any contribution that will lighten 

 the work should therefore be welcome, since it will enable zoolo- 

 gists to turn their attention to questions which are of more funda- 

 mental importance. This plan also serves incidentally as a means 

 of doing justice to the first describers of species without a too 

 narrow adherence to the rule of priority. The generic and speci- 

 fic names I have adopted in the following pages may not be 

 satisfactory from the standpoint of a purist, but I have endeavour- 

 ed to make clear which is the oldest name according to the Lin- 

 naean criterion. I have not undertaken any revision of the genera 



