PLATE X. 



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



FIG. 43. Entomobrya kincaidt sp. nov.; eyes of right side (X374-)- 



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



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



46. Tomocerus HZ^?;- Bourl., type; right aspect of right fore foot (X367)- 

 47- " " " " dental spines (X 200). 



48. " " " var.arcticusSchbtt; eyes of right side (X 3^7). 



49. " " " " J' " right aspect of left hind 

 foot(X367)- 



50. Tomocerus niger Bourl., var. arcticus Schott ; dental spines (X 200). 

 51- " " " " " " doubled dental spines 



(X200). 



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

 normal (X 200). 



53. Tomocerus niger Bourl., var. americanus Schott ; dental spines (X 200). 



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



55. " " " " left aspect of left hind foot (X 367). 



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



57. Machilis arctica sp. nov.; dorsal aspect of head (X28). 



58. " " " " cuticular figure (X434)- 



[116] (114) 



