PREFATORY NOTE. 



The fundamental arrangement in this list is a zoological one; 

 the subordinate arrangement of species under genera is chron- 

 ological. The combinations of generic and specific names are 

 those adopted in the work wliere the species have been most fully 

 discussed and illustrated. For the classification of the genera, 

 however, the writer is alone responsible. ' The collections of the 

 Museum include a considerable number of reproductions in plaster- 

 of-paris, gutta-percha and sulphur, of original specimens, and 

 these are, for convenience of reference, included in the list, but 

 the citations of these are marked with an asterisk (*) in the 

 margin of the page. The actual original specimens, including 

 those used for the first illustration of the species, are indicated 

 by having the reference to the illustration in heavy-face type. 



