208 Annals Entomological Society of America [Vol. X, 



that has, above everything else, made the controlling of certain 

 insect pests by introduced insect parasites the success that 

 it is. 



Early in 1913 one of the members of the H. S. P. A. Experi- 

 ment Station proceeded to Japan and eventually to Formosa, 

 Java and the Philippines, to study the death factors of Anomala, 

 Adoretus and allied "white grubs. " The work is still in progress 

 but as this is the first record of the successful introduction and 

 establishment of a Scolia in a new region a brief statement of 

 the establishment of Scolia manilce Ashm. in Hawaii may be 

 of interest to others working on similar problems. 



This insect was described by Ashmead from specimens 

 collected by Father Brown in the Observatory Gardens in 

 Manila. It is very common in the grounds of the College of 

 Agriculture at Los Banos, some forty miles from Manila, and 

 it was here that most of our work was done. The Dean of 

 the College very kindly placed the college insectary at our 

 disposal and assisted us in every possible way. 



After experimenting with different methods of handling the 

 parasite we eventually adopted the following methods: A small 

 quantity of soil was placed in the bottom of a small jelly jar 

 with a tin cover, two Anomala or Adoretus grubs were placed 

 in the soil, a twig of Alternanthera versicolor sprinkled with water 

 and a few drops of honey was stuck in the soil and a female 

 Scolia, caught in the field, was placed in the jar. After twenty- 

 four hours the jars were turned out and each grub which bore 

 an egg was placed in an artificial mud cell and the entrance 

 closed with mud ; the cells were packed in moist soil in tins with 

 tight-fitting lids, and the tins in wicker baskets or boxes were 

 shipped from Manila to Honolulu. By the time that they 

 reached Honolulu the Scolias had pupated, and the cocoons 

 were then placed in damp moss and the adults, when hatched, 

 mated in captivity; a certain proportion were turned out in the 

 field and a proportion retained for breeding. The mating was 

 easily accomplished by confining a female in a sleeve-cage 

 with a number of males and placing the cage in the sun. When 

 shipping by direct or fast boats no Scolia hatched out during 

 the voyage, but by more circuitous routes or by slow boats, 

 a larger or smaller percentage would hatch out and die. On an 

 average, sixty per cent, of the eggs placed in cells went through 



