CHARACTERISTICS OF FAMIIIES OF DIPTERA. xix 



Family Hippoboscidcc. 



Body horny and flattened. Head flattened. Antennas composed 

 of one joint only, and furnished with terminal bristle. First joint of 

 all, or, at least, of the anterior and middle tarsi, abbreviated. 



Family BraulidiE. 

 Wingless and blind ; parasitic on hive bee. 



Family Nycteribidcp.. 



Antennce short, 2'jointed. Head not flattened. First joint of all 

 the tarsi long, or very long in comparison with the following. Eyes 

 present. Spider-like. 



