Xatiiral History Notes of Southern Arizona. 13 



■ The high mountain of southern Arizona, Old Baldy, 

 ^H32 feet high, is an easy mountain to ascend, and the view 

 from the top will well repay the effort. The U. S. Depart- 

 ment of Forestry has cut a trail to the top, making the 

 ascent both safe and easy. July 23, I found the Ladybug, 

 Hippodamia convergens, up there by millions. The ground 

 was covered in places, and they were piled up under the low, 

 stunted shrubbery in heaps. I filled my hat with them in 

 a few scoops of my hands. Many pairs were in couple, and 

 all seemed to be in lively, healthy condition. Down lower 

 on the mountain side none were seen. I could not discover 

 the meaning of this strange migration, unless it was a sort 

 of honeymoon trip that insects, as well as the genus homo, 

 take to some expensive and uncomfortable place. When 

 impregnated, do these beetles descend the mountain to 

 deposit their eggs among the plant lice, w^hich form the food 

 for their young? 



