114 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[402 



scorpii nearly so small were at hand for study, the writer cannot say that such 

 characters do not exist in the latter. On the whole it seems best to consider 

 B. angustatus a species inquirenda until more and better material can be studied 

 and comparisons made between the form that appears here in America and that 

 which is found in Europe. 



BOTHRIOCEPHALUS CLAVICEPS (Goeze 1782) 

 [Figs. 19, 20, 23, 72, 85, 96] 



