BEETLES THAT *' BLUFF'- 235 



Having regard to the fact that three thousand species 

 of Perhdae are known, and that they have a wide 

 distribution over the earth's surface, one might have 

 expected that more would be known of their singular 

 life-history. They are, however, flies of very unattractive 

 appearance and great frailty, hence, save to anglers, by 

 whom they are esteemed as bait for trout, they attract 

 but little attention. 



