768 Contents 



PAGE 



The adult flies 845 



Structure 845 



The head 845 



The sclerites 845 



The mouth parts 846 



The antennae 848 



The eyes 854 



The thorax 854 



The legs 858 



The transverse suture 860 



The wings and their venation 860 



The abdomen 870 



Sexual dimorphism 876 



Haunts 876 



Activities 878 



Feeding habits 878 



Resting habits 879 



Swarming and mating 880 



Oviposition 881 



Photophilism 881 



Enemies 882 



Keys to the crane-flies of northeastern North America 883 



References cited 959 



Index 903 



