ON SOME PSEUDOSCORPIONS FROM JAPAN. 13 



stalk, as long as it is broad, the inner side somewhat convex, 

 the outer side slightly concave. Femur robust, with a short, 

 robust, but distinct stalk, the inner side slightly convex, a little 

 concave towards the extremity, the outer side very slightly con- 

 vex or nearly straight, femur, on the whole nearly parallel-sided, 

 straight, not curved. Tibia with a robust, distinct stalk, and 

 with the exception of the stalk, broadly oblong, the outer side 

 regularly and moderately convex, the inner side diverging from 

 the stalk, and then very convex, the membrane passing about 

 Vs backwards. Hand with a short stalk, convex on both sides 

 from rounded base, most so on the inner side. Fingers robust, 

 somewhat curved, as long as the hand, with a row of small, 

 truncated teeth on the inner margins, closely set and of equal height. 



Mandibles. The moveable finger with no protuberance on 

 the outer side, though sometimes with a slight indication of one. 



Legs with long, pointed hairs, the femora of the two poste- 

 rior pairs moderately broad. The coxa of the 1st pair with 

 a small, blunt, brown tooth on the outer corner. Claws simple. 



Length 1.2 mm. 



Measurements. Céphalothorax: long. 0.39; lat. 0.37. Fe- 

 mur: long. 0,36; lat. 0.13. Tibia: long. 0.21; lat. 0.16. Hand: 

 long. 0.28; lat. 0.21. Fingers: long. 0.28 mm. 



Localities. Negishi, February, 1905, 3 specimens ; Okayama, 

 September, 1904, 1 specimen (very young); Kanagawa, February, 

 1905, 1 specimen (very young). 



The new species has very great affinity to Obisium brevi- 

 femoratum Ellingsen, from Norway, and indeed it is very 

 difficult, even when comparing them, to find essential differences 

 between the two species. The probability, however, that the 

 same species lives in two such widely separated regions, is 

 small. It should also be taken into considei-ation, that the Ja- 

 panese specimens are rather young. 



The principal differences between the two forms are as follows : 

 the Japanese form is considerably smaller than the Norwegian ; the 



