64 U.S. NATIONAL MUSEUM BULLETIN 2 75 



Museum National d'Histoire Naturelle, Paris; these are indicated, 

 respectively, by the abbreviations BM and MNHN. Unless otherwise 

 stated, all other catalog numbers represent specimens in the collections 

 of the Division of Mammals, United States National Museum, Smith- 

 sonian Institution, Washington, D.C. 



The distribution maps, in most cases, indicate localities from which 

 I examined specimens. These are indicated by solid black circles. The 

 few localities showing published records are indicated by a solid black 

 triangle. The shaded portions of the maps (vertical and horizontal 

 lines) indicate the range of a given species or subspecies in Libya, as 

 judged from known records of occurrence. No species or subspecies 

 occurs in all parts of the shaded area but is limited to areas of suitable 

 habitat. 



4. Measurements: All measurements are given in millimeters and 

 are of adults unless otherwise indicated. Given first are the four 

 standard body measurements: Total length (from the tip of the 

 rostrum to the end of the last caudal vertebra) ; length of tail (from 

 the proximal end of the first caudal vertebra to the distal end of the 

 last caudal vertebra) ; length of hind foot (from the proximal end of 

 the calcaneus to the end of longest claw) ; length of ear (from the base 

 of the notch to the distal end of the pinna). Cranial measurements, 

 taken by dial calipers, follow the external measurements. When the 

 measurements of more than three specimens are given, they are listed 

 as average and extremes. If there are three specimens or less, their 

 measurements are listed individually, and the museum catalog number 

 is given for each. 



5. Diagnosis: Capitalized color terms are those of Ridgway 

 "Color Standards and Color Nomenclature" (1912). Noncapitalized 

 color terms are employed in those instances where a detailed color 

 description ^as deemed unnecessary. Whether the description repre- 

 sents winter or summer pelage is specified in those subspecies where 

 seasonal pelage colors differ significantly. In most cases detailed 

 descriptions involving the gross features of the skull and, in some 

 cases, characters useful in specific and subspecific diagnosis are given. 



6. Comparisons: Specimens from Libya are compared with those 

 representing marginal subspecies to determine their true taxonomic 

 position. Whenever possible, paratypical and topotypical specimens 

 are used in these comparisons to better validate the assignments. In 

 some instances, comparisons were made with all subspecies comprising 

 a given species, which frequently necessitated examination of speci- 

 mens from Egypt, Sudan, Tunisia, and Algeria. 



7. Remarks: All systematic problems and enigmas are considered 

 under this heading. Evidences of intergradation with other subspecies 

 and their interpretation are within the province of this section. Also 



