1911] Taylor: Mammals of the 1909 Nevada Expedition. 207 



Nasals : greatest length along interlying suture. 



Shelf of hony plate : distance from posterior ends of anterior 

 palatine foramina to anterior border of interpterygoid fossa 

 (post-palatal notch). 



Palatine slits: greatest length of anterior palatine foramina. 



Diastema : from anterior base of most anterior cheek-tooth to 

 posterior base of incisor. 



Post-palatal length: anterior border of interpterygoid fossa 

 (post-palatal notch) to inferior lip of foramen magnum. 



Maxillarij tooth-row: alveolar length of cheek-tooth series, 

 that is, the series of molariform teeth. 



Height of cranium at bullae : measured (vertically to the basi- 

 cranial axis of the skull) at point of greatest ventral bulge of 

 auditory bullae. 



Height of cranium above palate : measured (vertically to basi- 

 cranial axis) from bony palate to dorsal surface of skull. 



Height of cranium above basion: measured (vertically to basi- 

 cranial axis) from inferior lip of foramen magnum to dorsal 

 surface of skull. 



External jMexVsurements are those taken in the flesh by the 

 collector. 2'otal length is measured on the skinned body of the 

 mammal, from tip of cartilage of nose to tip of tail; tail verte- 

 brae, also measured on the skinned body from base of upper side 

 of tail when bent at right angles to body to tip of tail ; hind foot, 

 from heel to tip of longest toe. 



Averages include all the specimens listed. For example, 

 averages of all adults in the various tables are obtained by add- 

 ing the respective measurements or ratios of all the individuals; 

 not by dividing by two the sum of the averages of the males and 

 females in any case. 



Ridgway's Nomenclature of Colors, Edition of 1886, has been 

 used as the basis for color names. 



In the following pages Breeding SexVSOn is used as a general 

 term, including all of the following: (a) mating period, i.e., 

 time of running together and copulation ; (&) period of gestation, 

 i.e., time between fertilization of the egg and the birth of the 

 young; (c) suckling %)eriod, i.e., time during which young are 

 cared for by parent or parents. 



