90 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[260 



EXPLANATION OF PLATE 

 Lateral Aspect of the Mouth-parts or Proboscts 



Trichocera biniacula. 

 Chironoiiius ferrugineovittatus. 

 Rhabdophaga strobiloides. 

 Sciara varians. 

 Bibio feiiioratus. 

 Simulium venustum, female. 

 Tabanus giganteus, female. 

 Psychoda albipennis. 

 Mydas clavatus. 

 Lonchoptera lutea. 

 Rhyphus punctatus. 

 Proniachus vertebratus. 

 Leptis vertebrata. 

 Psilocephala haenwrrhoidalis. 

 Scenopinus fenestralis. 

 Platypesa velutina. 

 Pipunculus cingulatus. 

 Eristalis tenax. 

 Sapromyza vulgaris. 

 Desmonietopa latipes. 

 Stratiomyia apicula. 

 Oecothea fenestralis. 

 Chyromya concolor. 



