218 ILLINOIS BIOLOGICAL MONOGRAPHS [506 



EXPLANATION OF PLATE 



Fig. 55. Botkriocephalus scorpii, three anterior primary segments, to to preparation. The 



stars at the side indicate the extent of the segments. 

 Fig. 56. Botkriocephalus scorpii, one farther back, also toto. 

 Fig. 57. Botkriocephalus scorpii, another, showing reproductive rudiments. 

 Fig. 58. Clestohotkrium crassiceps, primary segment with reproductive rudiments, toto 



preparation. 



