GRINNELL — THE GENUS DIPODOMYS 
95 
The species are arranged by ^‘groups” from what appears to be the 
most generalized type to the most speciahzed. These groups are not 
at all comparable in rank to the subgenera currently recognized in some 
other families of rodents; in fact the genus Dipodomys as it stands 
seems to be remarkably compact and homogeneous. Yet the groups 
indicated do serve to express probably more close genetic relationship 
among the constituent species of each group than that obtaining 
between species representing different groups. 
HEERMANNI GROUP 
Dipodomys heermanni heermanni LeConte 
Dipodomys heermanni californicus Merriam 
Dipodomys heermanni eximius Grinnell 
Dipodomys heermanni tularensis (Merriam) 
Dipodomys heermanni dixoni (Grinnell) 
Dipodomys heermanni berkeleyensis Grinnell 
Dipodomys heermanni goldmani (Merrian) 
Dipodomys heermanni jolonensis Grinnell 
Dipodomys heermanni swarthi (Grinnell) 
Dipodomys morroensis (Merriam) 
Dipodomys mohavensis (Grinnell) 
Dipodomys leucogenys (Grinnell) 
Dipodomys panamintinus (Merriam) 
Dipodomys stephensi (Merriam) 
Dipodomys ingens (Merriam) 
SPECTABILIS GROUP 
Dipodomys spectabilis spectabilis Merriam 
Dipodomys spectabilis cratodon Merriam 
Dipodomys nelsoni Merriam 
PHILLIPSII GROUP 
Dipodomys phillipsii Gray 
Dipodomys perotensis Merriam 
Dipodomys ornatus Merriam 
Dipodomys elator Merriam 
MERRIAMI GROUP 
Dipodomys merriami merriami Mearns 
Dipodomys merriami ambiguus Merriam 
Dipodomys merriami atronasus Merriam 
Dipodomys merriami parvus Rhoads 
Dipodomys merriami simiolus Rhoads 
Dipodomys merriami arenivagus Elliot 
