PREVIOUS WORK WITH INSECT PARASITES. 37 
and that wherever it occurs there it has spread from a center of 
imported American fruit trees. Finally, as a result of this extended 
trip, the native home of the San Jose scale was found to be in northern 
China in a region between the Tientsin-Peking Road and the Great 
Wall, and its original host plant was found to be a little haw apple 
which grows wild over the hills. Into that region no foreign intro- 
ductions of fruit or fruit trees had ever been made, and the fruits 
in the markets were all of the native sorts. Here in China was found 
everywhere present a little ladybird, Chilocorus similis Rossi (fig. 9), 
feeding in all stages upon the San Jose scale. One hundred and fifty 
Fic. 9.—The Asiatie ladybird (Chilocorus similis) ,an imported enemy of the San Jose seale: a, Second 
larval stage; b, cast skin of same; c, full-grown larva; d, method of pupation, the pupa being retained 
in the split larval skin; e, newly emerged adult, not yet colored; 7, fully colored and perfect adult. 
All enlarged to the same scale. (From Marlatt.) 
or two hundred specimens of the beetle were shipped by Mr. Marlatt 
to Washington alive, but all but two perished during the winter. One 
at least of the two survivors was an impregnated female, and began 
laying eggs early in April. From this individual at least 200 eggs 
were obtained, the work being done in breeding jars. After some hun- 
dred larve had been hatched from these eggs the beetles were placed 
on a large plum tree in the experimental orchard and protected by a 
wire-screen cage covering the tree. The stock increased very rapidly, 
and during August shipments to various eastern experiment stations 
were begun, about 1,000 specimens being sent out. At the end of the 
