PLATE IX. 



[Proc. Wash. Acad. Sci., Vol. IV, PI. VII.] 



FIG. 25. Aphoriira octopunctata Tull.; right postantennal organ, etc. ( X 367). 



26. " " " dorsal aspect of right antennal organ 

 ( X 434)- 



27. Aphorura octopunctata Tull.; left aspect of left hind foot ( X 367). 



28. " " " left aspect of left anal spine ( X 357)- 



29. " dentata sp. nov.; represents arrangement of dorsal pseudo- 

 celli ( X 20). 



30. Aphorura dentata sp. nov. ; right postantennal organ ( X 434)- 



31. " " " " deeper structure of postantennal organ 

 (X434)- 



32. Aphorura dentata sp. nov.; base of right antenna ( X I2 7) 



33. " " " " dorsal aspect of right antennal organ 

 (X434)- 



34 Aphorura dentata sp. nov. ; left aspect of right hind foot ( X 200). 



35. " " " " dorsal aspect of anal spines ( X 200) .[ 



36. " " " " right aspect of right anal spine ( X 200). 



37. Isotoma fimetaria (L.) Tull.; antenna ( X 60). 



38. " " " " left aspect of right hind foot ( X 434)- 



39. " " " " left mucro ( X 434)- 



40. " viridis Bourl., var. arctica Schott ; eyes and postantennal or- 

 gan of right side ( X 200). 



41. Isotoma viridis Bourl., var. arctica Schott; left aspect of left fore foot 

 ( X 200). 



42. Isotoma viridis Bourl., var. arctica Schott; right aspect of right 

 mucro (X434)- 



[114] (112) 



