86 Report of the President 



5 of them new, to the island's known fauna. The collection 

 made by Mr. R. D. Camp during three months in southeastern 

 Arizona is especially rich in lizards and proves the area of 

 the Huachuca Mountains a veritable center for differentiation 

 and distribution of at least one genus, Holbrookia. The ex- 

 pedition in Mexico under Mr. Paul Ruthling has worked in 

 the region of Mexico City, Vera Cruz, and Guadalajara, Jal- 

 isco, with total collections covering about 60 genera and 100 

 species. 



