U.S. NATIONAL MUSEUM 



BULLETIN 275, PLATE 4 



Rocky outcroppings and large boulders of the escarpment 5 kilometers west of Cussabat, 

 Tripolitania, where a large series of gundis (Ctenodactylus) was obtained in June 1962. 





Hamada (pebble desert), acacias, and escarpment approximately 100 kilometers west- 

 southwest of Ubari, Fezzan. This "pebble desert" is the most characteristic type of 

 terrain in the Libyan Sahara. Rodents occur sparingly in these "hamada" deserts and are 

 usually represented by Meriones crassus or the ubiquitous Gerbillus campestris, December 

 1961. 



