1912] Taylor: A New Perognathus 163 



interorbital space peculiar to the San Joaquin Valley form. This 

 would practically preclude the possibility of the Fort Tejon 

 specimens being referable to the subspecies inhabiting the San 

 Joaquin west of Buena Vista Slough, since the latter race has 

 a broad interorbital space. As will be noted from the table til' 

 comparative measurements, the percentage difference between the 

 averages of the males of the two forms is greater, with respect to 

 interorbital constriction, than in the case of any other skull 

 measurement given, and this character! broad interorbital space) 

 is uniform throughout the series of adults of it* gh ct it*. 



Osgood (1900, p. 34) further states that the only available 

 topotype of Perognathus I. longimembris is a young adult which 

 agrees perfectly with specimens from Fresno and other points 

 in the San Joaquin Valley. Also that two young specimens from 

 San Emigdio and Rose Station, both being near Fort Tejon. are 

 also clearly the same as those from Fresno. These statements 

 are confirmed by an examination of the three specimens in ques- 

 tion, kindly loaned to the writer from the Biological Survey col 

 lection through the courtesy of Mr. II. W. Henshaw, Chief of 

 the Bureau. 



Osgood concludes that the name longimembris should be ap- 

 plied to the animal recently called inornatus (C. H. Merriam, 

 1889, p. 15). It thus becomes apparent that Perognathus inor- 

 natus, type locality Fresno, California, was based on this darker 

 subspecies described from Fort Tejon. and that the McKittrick 

 form is the one to which the new name should be given. 



