CONTENTS 



Paa:e. 



Tlie blaek-striped horsefly ( Tabanus lasloplitJiahnux Macq. ) 19 



The autumn horsefly ( Tabanus snlcifrous Macq. ) 22 



The l)lack and white horsefly ( Tabanus slygius Say ) 28 



The river horsefly ( Tabanus vivax 0. S. ) 32 



The black horsefly ( Tabanus atratus Fab. ) 34 



The marsh earfly ( Chrysops marens Walk. ) 36 



LUSTRATIONS 



Page. 

 Fig. 1. Tabanus lasiophthalmvs: male and female adults, larva, pupa and 



details 21 



2. Tabanus sulclfrons: male and female adults, pupa and details 23 



3. Vespa maculata: adult 26 



4. Tabanus slygius: eggs on leaves in usual location 29 



5. Tabanus stygius: eggs on leaf in unusual location 30 



6. Tabanus stygius: female adult 31 



7. Tabanus stygius: pupa and detai Is 31 



8. Tabanus vivax: male and female adults, larva, pupa and detads 32 



9. Tabanus atratus: male and female adults 35 



10. Tabanus atratus: pupa and details 36 



11 . Chrysops moerens: adult ovipositing 37 



12. Chrysops nicerens: egg masses on leaf 38 



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