GRINNELL — THE GENUS DIPODOMYS 
97 
Certain names which have been bestowed upon kangaroo rats will 
not be found in the above list for the reason that they are considered by 
the present reviewer as applying to forms named previously. These 
synonyms, and their allocations, are as follows: 
helleri of Elliot = deserti of Stephens 
kernensis of Merriam = merriami of Mearns 
mortivalUs of Elliot = merriami of Mearns 
nevadensis of Merriam = merriami of Mearns 
nitratus of Merriam = merriami of Mearns 
pallidulus of Bangs = californicus of Merriam 
similis of Rhoads = simiolus of Rhoads 
streatori of Merriam = heermanni of LeConte 
trinitatis of Kellogg = californicus of Merriam 
wagneri of LeConte = agilis of Gambel 
These cases have been worked* out at some pains and are reasonably 
certain. There are very hkely a few names in the main list above that 
will eventually have to be synonymized also. But on the other hand 
there are undoubtedly many more good new forms to be named. So 
that future systematic workers in this interesting genus will find much 
yet to do. 
Berkeley, California. 
