104 BULLETIN 114, UNITED STATES NATIONAL MUSEUM. 



SUMMARY. 



From the preceding descriptions it appears that this group is 

 represented by a series of forms arranged in linear order across the 

 United States and northern Mexico (fig. 24), and that each member 



Fig. 24.— Map showing the distribution of the various forms op the getulus group. 



of the group is most closely related to the form inhabiting the con- 

 tiguous region. Cdliforniae offers the only exception, and this is 

 discussed separately in the section devoted to it. 



