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7 y o . a 23 , yak t. 
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- cHaac CTERIS TICS OF FAMILIES OF DIPTERA. xix 
| Family ippoboscide. 
"Body horny and flattened. Head flattened. Antennze 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 Braultda. 
Wildes and blind ; parasitic on hive bee. 
Family Wycteribide. 
_ Antenne short, 2-jointed. Head not flattened. First joint ot all 
the tarsi long, or very long in comparison with the following. Eyes 
present. Spider-like. 
