FOLSOM: MOUTH-PAKTS OF OKCIIESELLA CINCTA. 



35 



pable of further modification in either the mandibulate or suctorial 

 direction. Indeed, the latter modilication has already occurred in the 

 Collembolan genus Neanura. 



In conclusion, I desire to thank Mr. Samuel Henshaw, whose knowl- 

 edge of entomological literature has been of great service to me. I wish 

 to acknowledge my special indebtedness to Professor Mark ; for his careful 

 and kind supervision have been my greatest aid and encouragement. 



