318 



NORTH AMERICAN DIPTERA 



Lauxaniidae III. — 18, Lauxaiiia cylindricornis; 19, Trigonometopus vittatus ; 20, Campto- 

 prosopella vulgaris; 21, Lauxaniella opaca ; 22, Steganolauxania latipennis; 23, Asilostoma; 24, 

 Griphoneura; 25, Freyia nigrita; 26, Asilostoma palpalis; 27. Neominettia contigua. 



