ILLINOIS BIOLOGICAL MONOGRAPHS 



VOLUME 3 



Psychoda 



263 



mx.pl 



ymx.pl 



-mx pi 



*79 Pipundfalus 



280 1 I \ 



Lonchoptera Psilocephata 



282 



Scenopinus 



284 



Dolichopus 



® 



PETERSON HEAD AND MOUTH PARTS OF DIPTERA PLATE XII 



