ILLINOIS BIOLOGICAL MONOGRAPHS 



EXPLANATION OF PLATE XXIII 



ENDOSKELETON OF THE HEAD 



Fig. 482. 



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"/ 

 ap 



Cupes concoloT. 

 Ccphaloon lepturides. 

 Nacerda melanura. 

 Tomoxia bidentata. 

 Macrosiagon dimidiaium. 

 Epicauta marginata. 

 Eurystctlms debilis. 

 Othnius sp. 

 Pyiho planus. 

 Neopyrochroa flabellata. 

 Macratria murina. 

 Notoxus anchord. 

 Zonantes fasciaius. 

 Cebrio bicolor. 

 Euthysanius lautiis. 

 Saiidalus niger. 

 Alans oculalus. 

 Isorhipis ruficornis. 

 Throscus chevrolati. 

 Chakophora virginiensis. 

 Psephenus Icconiei. 

 Helichus striatus. 

 Stenelmis sinuata. 

 Heterocerus undatus. 



antafossa 



cervepimeron 



cervepisternum 



cervesternum 



compound eye 



chitinized area 



corpotentorium 



epicranial arm 



invagination 



labrum 



