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CONTENTS 
PAGE 
Entomological Extension Work in Pennsylvania 1 
Planning a State Extension Project in Entomology 
C\ H. Hadley 157 
T. H. Parks 157 
S. J. Hunter 164 
E. R. Sasscer and H. F. Dietz 168 
Miris saltator Lindm. as a Parasite of the Hessian Fly W. R. McConnell 168 
Experiments with Grasshopper Baits with Incidental Observations on 
the Habits and Destructiveness of the Differential Grasshopper, Melano- 
plus differentialis A. W, Morrill 175 
Suggestions for a New Method of Destroying Chinch-bugs W. P. Flint 186 
Some Results of Two Years' Investigations of the Rocky Mountain 
Spotted Fever Tick in Eastern Montana R. R. Parker 189 
Sodium Flouride—A Specific for Biting Lice 3 
F. C. Bishopp and H. P. Wood 194 
Mosquito Flight as a Factor in the Problem of Control 1 T . J. Headlee 194 
The Mosquitoes of Colorado T. D. A. Cockerell 195 
Section on Apiculture 
Important Factors in the Spread and Control of American Foulbrood 
E. D. Ball 200 
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G. N. Wolcott 205 
Notes on Some Southwestern Buprestidae H. E. Burke 209 
A Note on False Wireworms with Especial Reference to Eleodes tricostata 
J. W\ McColloch 212 
Seasonal Irregularities of the Codling Moth Leroy Childs 224 
Some Factors Influencing the Distribution of Pemphigus hetae in the 
Beet Fields A. C. Maxson 231 
The Pink Bollworm, Gelechia gossypiella, in Egypt H. A. Ballou 236 
Notes on the Woolly Aphis 
G> G. Becker 245 
Fertilization of Queen Bees 
Scientific Notes 
Editorial 
Reviews 
Current Notes 
H. E. Ewing and Albert Hartzell 256 
C. W. Howard and L. V. France 265 
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