1LLIX0IS BIOLOGICAL MONOGRAPHS 



VOLUME 3 



Aphiochaeta 



544 



Stratiomyia 



545 



Straliomyia 



546 



Kmpis 



547 



Empis 



548 



Exoprosopa Exi 



549 



550 



ffi 



PETERSON HEAD AXD .MOUTH PARTS OF DIPTERA PLATE XXIII 



