304 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



It is possible that crassus is rather localized, and perhaps seldom 

 abundant as well, because a collection of Orthoptera from Uaja 

 California made in 1938 by E. S. Ross, of the California Academy 

 of Sciences, does not contain it. Neither is it mentioned by He- 

 bard (Proc. California Acad. Sci., ser. 4, vol. 12, pp. 319-340, 

 1923; Trans. Amer. Ent. Soc, vol. 57, pp. 113-127, 1931) in re- 

 porting two other collections from Baja California. 



The southern tip of Baja California is characterized by scrub 

 vegetation and belongs to the Tropical Zone. Readers are referred 

 to Nelson (Mem. Nat. Acad. Sci., vol. 16, 194 pp., 35 pis., 1921) 

 for a detailed scientific report on the biological characteristics 

 of Baja California. A popular account is by Gardner (Holiday, 

 vol. 3, No. 4, p. 62 and various subsequent pages, 1948) . 



a U. S. GOVERNMENT PRINTING OFFICE: 1950 -39^016 



