390 BIOLOGICAL CONTROL 



derived from stock originally of American descent were received 

 from France. They multiplied with great rapidity in captivity, 

 and in 1924 liberations were made in the open in a number 

 of widely separated localities. Notwithstanding the prevailing 

 inclement weather, coupled with an abnormal scarcity of the host, 

 the Aphelinus survived in certain orchards until the following 

 year. At the present time it appears to be maintaining itself in a 

 few places in small numbers, but without spreading or increasing 

 to any appreciable extent (vide also Thompson, 1934). 



