170 



NORTH AMERICAN DIPTERA 



Asilida; III. — 47, Pilica sp. (Panama); 4S, Atomosia tibialis, liead from in front; 49. 



Neopogon; 50, Coinantella fallei ; 51. Cerdistus dolichomerus ; 5:^ Callinicus calanus; 53, 



Senoprosopis (Panama); 54. Hodophylax aridiss ; 55, Panamasilus xylota; 56, Plesioma; 57, 

 Heleiopogon macerinus; 58, Lastaurus. 



