PLATE X. 



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



FIG. 43. Entomobrya kincaidi 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 niger Bourl., type; right aspect of right fore foot (X367)' 



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



48. " " " var. arc/z'c#s Schott; eyes of right side (X 367). 



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

 foot (X 367)- 



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. Paptrius 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) 



