Vi CONTENTS. 



Hadwen, S., and Cameron, A. E. page. 



A Contribution to the Knowledge of the Bot-flies, Gastrophilus 

 intestinalis, De G., G. haemorrJioidalis, L., and G. nasalis, L. . . 91 



Johnson, W. B. 



Domestic Mosquitos of the Northern Provinces of Nigeria 325 



Lamb, C. G. 



On a Parasitic Drosophila from Trinidad 157 



Lodge, Olive C. 



An Examination of the Sense-reactions of Flies 141 



Marshall, Dr. Guy A. K. 



Some New Injurious Weevils from Asia 273 



Tothill, John D. 



Some New Species of Tachinidae from India 47 



Some Notes on the Natural Control of the Oyster-shell Scale, Lepido- 

 saphes ulmi 183 



Tragardh, Dr. Ivar. 



On a new Method of ascertaining the Parasites of the respective Host 

 Insects in a mixed Infestation 75 



Turner, E. E. 



On Braconidae parasitic on Diatraea saccharalis in Demerara .... 81 



Waterston, James. 



On the Mosquitos of Macedonia 1 



Notes on some Blood-sucking and other Arthropods (except Culicidae) 

 collected in Macedonia in 1917 153 



Williams, C. B. 



The Sugar-cane Froghopper in Grenada 83 



A Froghopper on Sugar-cane in British Guiana 163 



MISCELLANEOUS. 

 Collections received 89, 175, 271, 359 



