292 



NORTH AMERICAN DIPTERA 



Trypaneidfe IV.~45, Acrotania; 46, Blepharoneura ; 47. Acidogona ; 48. Polionota; 49, 

 Trypeta;"50. 51, Straussia longipennis ; 52, Xanthaciura insecta ; 53, Acidogona melaneura; 54, 

 Tetreuaresta obscuriventris; 55. Eurosta comma; 56. Trypanea. 



