410 PROCEEDINGS OF THE ACADEMY OF [1893. 



the other hand it is peculiarly diagnostic of Perodipas from Cali- 

 fornia and Oregon ; g, C. pawn* came from Oregon ; Perodipus has 

 also been taken there and in southeastern Washington but I am not 

 aware of any records of Perognathus from these States. 



If the type of Peale's mysterious rodent, like other priceless and 

 ill-used novelties of the Audubonian period, "cannot be found," to 

 disprove the above interpretation, it cannot be denied that there is 

 much evidence in favor of its being the type of a five-toed Kangaroo 

 Rat instead of a five-toed Pocket Mouse. As such, Cricetodipus 

 Peale, 1848, antedates Perodipus Fitzinger, 18(i7. 



( 5). Dr. Merriam's statement that /on//, mollipilosus and C. parvus 

 all came from the Pacific Province now needs qualification. While 

 this is probably true of the last two, lordi should certainly be assigned 

 to a region quite devoid of the faunal peculiarities of the Pacific 

 slope. 



Previous to my rediscovery of lordi its precise habitat in British 

 Columbia could only be conjectured, and so far as it went Dr. Mer- 

 riam's supposition that this type came from the West Cascade region 

 was reasonable enough. 



From the nature of its chosen habitat at Vernon, and the absence 

 of a similar environment west of the Cascades it is more than probable 

 that the type came from the same region farther south and that the 

 species is essentially a Great Basin form. 



The following species of North American mammals have recently 

 been added to the collections of the Academy of Natural Sciences of 

 Philadelphia. They were taken by Mr. R. B. Herron, who is at the 

 present time continuing a collecting trip in California in the interests 

 of the Academy. Other novelties which may be taken by Mr. 

 Herron, as well as a circumstantial account of the entire collections of 

 birds and mammals made by him, will appear in a future number of 

 the Proceedings. 



1. Dipodomys simiolus, ' sp. nov. (Type No. 1616, J Col. Acad. Nat. Sciences. 

 l'hila. : Agua Caliente, California, Oct. lit. 1893, col. by R. B. Herron). 



Description. — Minature of I>. deserti with very similar colors, 



color- pattern and proportions. No white terminal pencil, the dark 



■ Simi an ape or mimic ; olns diminutive. 



