Fig. 43 

 44 

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47 

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50 

 5i 



52 



53 

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57 

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PLATE X. 



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



Entomobrya kincaidi sp. nov.; eyes of right side (X374)» 



" " " " left aspect of left hind foot (X 434)- 



" " " " left aspect of left mucro (X 434)- 



Tomocerus niger Bourl., type; right aspect of right fore foot (X3^7)- 

 " " " " dental spines (X 200). 



" " " var. arcticus Schott ; eyes of right side (X 367). 



" " " " „" " right aspect of left hind 



foot (X 367)- 

 Tomocerus 7iiger Bourl., var. arcticus Schott; dental spines (X200). 



" " " " " " doubled dental spines 



(X200). 



Tomocerus nigcr Bourl., var. arcticus Schott ; dental spines slightly ab- 

 normal (X 200). 



Tomocerus tiiger Bourl., var. a??iericanus Schott ; dental spines (X 200). 

 Papirius palmatus sp. nov.; eyes of left side (X 127). 



" " " " left aspect of left hind foot (X 367)- 



" " " " left aspect of left mucro, etc. (X 200). 



Machilis arctica sp. nov.; dorsal aspect of head (X 28). 

 " " " " cuticular figure (X434)- 



[116] 



("4) 



