Jan. 15. 191S 



Three-Cornered Alfalfa Hopper 



349 



Table II. — Length of the egg stage of the three-cornered alfalfa hopper at Tempe, Ariz., 



in IQ12; host, alfalfa 



a Influenced by artificial heat. 



^ No way of getting exact count without disturbing the eggs. 



c Average mean temperature. 



At Greenwood, Miss., Mr. Gibson was able to get eggs to hatch in the 

 remarkably short time of four days. On June 30 eggs were deposited in 

 cowpea stems, and on July 3 several. had hatched. The writer is unable 

 to surmise the reason for this short duration of the incubation period. 

 The temperature, although no records are available, could hardly have 

 been higher than that recorded during July at Tempe. The amount of 

 humidity may have had something to do with the hasty incubation; 

 then, too, the different host plant, all records from Tempe having 

 been made on alfalfa, may have been a factor in lessening the period. 

 Table III gives the results of Mr. Gibson's experiments to determine 

 the length of the egg stage. 



