BUREAU OF ENTOMOLOGY AND PLANT QUAKANTINE 83 
site were collected from Artemisia in the Paris section during November and 
December 1935. In addition, the cooperative work in Japan with the Canadian 
Department of Agriculture, for which the costs of collection were defrayed by 
that department, has provided a number of colonies of several parasites for 
liberation in the United States. 
ALFALFA WEEVIL PARASITES 
A total of 5.000 adults of alfalfa weevil parasites, largely Peridesmia phyto- 
nomi Gahan, were reared at the laboratory in southern France and forwarded 
to California, where the colonization work is being handled cooperatively with 
the State Agricultural Experiment Station. These parasites attack the egg stage 
of the alfalfa weevil. A larval parasite. Tetrastichus incertus Ratz., was reared 
in the laboratory and 778 parasitized host larvae were forwarded during April 
and May. These are expected to produce approximately 7,000 adults for coloni- 
zation in the infested sections. 
EUROPEAN PINE SHOOT MOTH PARASITES 
Extended collections of shoots infested by the European pine shoot moth were 
made in England during May and June and the material examined for parasites. 
A total of 6,775 parasite cocoons were isolated and forwarded. These repre- 
sented five species, several of which were different from those imported from 
Austria in previous years. 
LARCH CASEBEARER PARASITES 
The collection work on the larch casebearer was done in England during May 
and 102,340 cases containing fully developed larvae were secured and shipped to 
the United States for rearing. The parasitization of this pest in England proved 
to be considerably lower than that in Austria in previous years. Several desir- 
able parasites not previously secured in Austria, however, were represented in 
this material. 
ELM LEAF BEETLE PARASITES 
Fifty thousand adults of the elm leaf beetle were collected in southern France 
during the winter and shipped to the United States for rearing of the tachinid 
parasite Anachaetopsis nitidula Rond. One shipment of field-collected eggs com- 
prising 533 clusters was forwarded from Japan to California. These were 
heavily parasitized by Tetrastichus sp., a form different from that previously 
imported from Europe. 
FRUITFLY PARASITES FOR HAWAII 
Four expeditions into tropical countries in search of natural enemies of fruit- 
flies were sent out in the fall of 1935, and these began their exploratory work in 
East Africa, West Africa, Brazil, and India, respectively. The first shipments 
of fruitfly parasites were made in January, and since that time three species 
from West Africa and three species from Brazil have been liberated in Hawaii. 
In addition, two species of predacious staphylinid beetles from Brazil which feed 
upon fruitfly larvae have been received and colonized. Numerous shipments of 
Opius crawfordi K. and P. have been received from the Bureau laboratory in 
Mexico and of Opius anastrephae Vier. from Puerto Rico. Incidental to the 
fruitfly work, two parasites and several scale insect predators of the pineapple 
mealybug were received from Brazil. 
INTRODUCTION OF NATURAL ENEMIES OF INSECTS INTO PUERTO RICO 
A special activity provided for importing into the island of Puerto Rico natural 
enemies of insect pests. In the exploratory work special attention was directed 
to the parasites of the sugarcane hoi-ei-. The one expedition to the British West 
Indies and South America was in the field from October 1935 to May 1936 The 
first shipment of parasites was received from Hawaii in September 1935 and 
during the remaining portion of the year .".7 speeds of parasites and predators 
were received and colonized. These represent a total of 115,354 parasites im- 
ported during that period. Eight of the introduced species have been recovered 
and three of them have been sufficiently well established to p« rmit recolonization 
from the established colonies. The hosts Of these natural enemies and the 
countries of origin are given in table 22. 
