78 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[248 



EXPLANATION OF PLATE 



Caudal and Lateral Aspects of the Head and the Tentorium 



Oecothca fenestralis, caudal aspect. 



Gastrophihts equi, caudal aspect. 



Olfersia ardeae, caudal aspect. 



Hypothetical head, lateral aspect. 



Hypothetical tentorium, lateral aspect. 



Tabanus giganteus, female, lateral aspect. 



Tabanus giganteus, lateral aspect of the tentorium. 



Simulium vcnustum, female, lateral aspect. 



Leptis vertebrata, male, lateral aspect. 



Mydas clavatus, lateral aspect. 



Promachas vertebratus, lateral aspect. 



Promachus vertebratus, lateral aspect of the tentorium. 



Scenopinus fenestralis, female, lateral aspect. 



Sciara various, lateral aspect. 



Pipunculus cingulatus, lateral aspect. 



Chironomus fcrrugincovittatus, lateral aspect. 



Bibio jcmoratus, female, lateral aspect. 



Bibio jcmoratus, male, lateral aspect. 



