BTJBEATJ OF ENTOMOLOGY AND PLANT QUARANTINE 89 
white-fringed beetle; Exenteru*. a genus of parasites of injurious 
sawflies; the moth family Oecophoridae: My&us, an important genus 
of aphids: and Osmm, a large group of bees. Definite progress was 
also made on a considerable number of research projects that were 
not completed during the year, including a generic revision of the 
North American thrips, a study of the American thrips belonging to 
the genera Thrips and Fremkbhdella^ revision of the weevil genus 
Hltyncolus, classification of the buprestid beetles making up the tribe 
Chrysobothrini. revisional studies of the bark beetles of the genera 
Hylastes and Psevdohylesirms^ classification of the white grubs or 
laryae of the genus Phyllophaga, reyision of the geometrid moths of 
the genus EUopia, studies on the American Phycitinae, monograph 
of the blowflies of North America, revision of the fruitflies of the 
genus Anastrepha, revision of the North American wasps belonging 
to the genus Trypoxylon. studies in the classification of male ants, 
revision of the carpenter ants belonging to the genus Oamponotus^ 
generic reyision of the family Cicadellidae (leafhoppers), a study 
of the true bugs making up the family Lygaeidae, review of the 
aphid genus Kakimia, revision of the grasshoppers of the genus Or- 
phvlellcL, a study of the order Protura, generic classification of the 
North American fleas, revisions of the scale insects belonging to the 
genera Asterolecanium and Cerocoeeu** and a study of the male 
genitalia of the Hymenoptera. 
FOREIGN PARASITE INTRODUCTION 
The foreign work of parasite introduction, centering largely at the 
field stations at St. Cloud, France, and Yokohama, Japan, has con- 
tinued on the same series of crop pests as indicated last year, to which 
has been added the asparagus beetle and the pea moth in Europe and 
the white-fringed beetle in South America. 
PARASITES OF CEREAL AND FORAGE INSECTS 
Continued attention was given to securing parasites of the hessian 
fly, the vetch bruchid, and the European corn borer. Of hessian fly 
parasites, 2 shipments of Trichacis remulus (Walk.), totalling 518 
adults, were made. A new and promising area for parasite collection 
was found in Morocco, where the infestation is heavier than in France 
and parasites are much more numerous. Stem infestation averaged 
about 67 percent during 1938 and parasitization ranged up to 76 per- 
cent, as contrasted with a very low percentage in France. The par- 
ticular value of Moroccan parasites is the apparent readiness with 
which they attack the fall generation. Two new and promising 
species were secured from the Morocco material. 
Vetch bruchid parasite material imported from France during the 
year consisted of 39,550 host eggs which had been exposed to Triaspis 
thoracicus | Curt.) and 2,776 adults of a new larval parasite. Trtrnsti- 
chu8 sp. A total of 1,124 adults of Triaspis were shipped to North 
Carolina for early colonization during May and June. 
Work on European corn borer parasites was restricted to the secur- 
ing of Phaeogenes rdgridens Wesm. from Italy. A total of 8,322 
adults and 5.720 parasitized host pupae were forwarded during 
August. 
