CONTENTS. 
Page. 
Introduction 9 
First appearance of the alfalfa weevil in the United States 9 
Spread of the pest 10 
Investigations by the Utah Experiment Station 11 
Cooperation of the Bureau of Entomology and the Utah Experiment Station . . 12 
Cooperation with other bureaus of the United States Department of Agriculture. 14 
Variety experiment 14 
Investigations of vertebrate enemies 15 
The insect not correctly determined 15 
Appearance of a second species in Utah 15 
Description and seasonal history of the alfalfa weevil 15 
Egg-laying period 19 
E\ddence of a partial second generation 20 
The larva 21 
Larval period 22 
Cocooning and pupating 23 
Food plants 24 
Migration and diffusion 25 
Field experiments in destrojdng the alfalfa weevil 26 
Street-sweeper experiments 27 
Wire-brush experiment 27 
Cultivation in connection with irrigation 29 
Burning machine 29 
Reduction in quality of hay caused by the alfalfa weevil 30 
Natural enemies 30 
Invertebrates 31 
Predaceous enemies 31 
A native true parasite 34 
Introduced parasites 34 
Egg parasites 35 
Mymarid egg parasite 35 
Pteromalid egg parasite 35 
Parasites of larvse and pupae 36 
Pteromalid larval parasite 36 
Other parasites 38 
Vertebrates • 40 
Fungous enemies , 41 
Index 43 
5 
