78 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[248 



EXPLANATION OF PLATE 

 Caxjdal and Lateral Aspects of the Head and the Tentorium 



Fig- 137- 

 Fig. 138. 

 Fig. 139 

 Fig. 140. 

 Fig. 141 

 Fig. 142. 

 Fig. 143 

 Fig. 144- 

 Fig. 145 

 Fig. 146. 

 Fig. 147 

 Fig. 148. 

 Fig. 149. 

 Fig. ISO. 

 Fig. 151 

 Fig. 152. 

 Fig. 153 

 Fig. 154- 



Oecothea fenestralis, caudal aspect. 



Gastrophilus equi, caudal aspect. 



Oifersia ardeae, caudal aspect. 



Hypothetical head, lateral aspect. 



Hypothetical tentorium, lateral aspect. 



Tabanus giganteus, female, lateral aspect. 



Tabanus giganteus, lateral aspect of the tentorium. 



Siniulium venustum, female, lateral aspect. 



Leptis I'crtebrata, male, lateral aspect. 



Mydas claz'atus, lateral aspect. 



Proiiiachus vertebratus, lateral aspect. 



Promachus vertebratus, lateral aspect of the tentorium. 



Scenopinus fenestralis, female, lateral aspect 



Sciara varians, lateral aspect. 



Pipunculus cingulatus, lateral aspect. 



Chironomus ferrugineovittatus, lateral aspect. 



Bibio femoratus, female, lateral aspect. 



Bibio femoratus, male, lateral aspect. 



